44PLCC DS200327 MTD48 LQA44A - Datasheet Archive

 

COP8SBE9/SCE9 8-Bit CMOS Flash Microcontroller with 8k Memory, Virtual EEPROM and Brownout Reset 1.0 General Description The

 

March 2004 COP8SBE9/SCE9 8-Bit CMOS Flash Microcontroller with 8k Memory, Virtual EEPROM and Brownout Reset 1.0 General Description The COP8SBE9/SCE9 Flash microcontrollers are highly integrated COP8TM Feature core devices, with 8k Flash memory and advanced features including Virtual EEPROM, High Speed Timers, USART, and Brownout Reset. This single-chip CMOS device is suited for applications requiring a full featured, in-system reprogrammable controller with large memory and low EMI. The same device is used for development, pre-production and volume production with a range of COP8 software and hardware development tools. Devices included in this datasheet: Device Flash Program Memory (bytes) RAM (bytes) Brownout Voltage Max Input Clock Frequency I/O Pins Packages Temperature COP8SBE9 8k 256 2.7V to 2.9V 3.33 MHz 37,39 44 LLP, 44PLCC 44PLCC, 48 TSSOP 0°C to +70°C COP8SCE9 8k 256 4.17V to 4.5V 10 MHz 37,39 44 LLP, 44PLCC 44PLCC, 48 TSSOP 0°C to +70°C -40°C to +125°C 2.0 Features KEY FEATURES n 8k bytes Flash Program Memory with Security Feature n Virtual EEPROM using Flash Program Memory n 256byte volatile RAM n USART with onchip baud generator n 2.7V ­ 5.5V In-System Programmability of Flash n High endurance -100k Read/Write Cycles n Superior Data Retention - 100 years n Dual Clock Operation with HALT/IDLE Power Save Modes n Two 16-bit timers: - Timer T2 can operate at high speed (50 ns resolution) - Processor Independent PWM mode - External Event counter mode - Input Capture mode n Brown-out Reset n High Current I/Os - B0 ­ B3: 10 mA @ 0.3V - All others: 10 mA @ 1.0V OTHER FEATURES n Single supply operation: - 2.7V­5.5V (0°C to +70°C) - 4.5V­5.5V (-40°C to +125°C) n Quiet Design (low radiated emissions) n Multi-Input Wake-up with optional interrupts n MICROWIRE/PLUS (Serial Peripheral Interface Compatible) n Clock Doubler - 20 MHz operation from 10 MHz Oscillator (COP8SCE9) with 0.5 µs Instruction Cycle - 6.67 MHz operation from 3.33 MHz Oscillator (COP8SBE9) with 1.5 µs Instruction Cycle n Eleven multi-source vectored interrupts servicing: - External Interrupt - USART (2) - Idle Timer T0 - Two Timers (each with 2 interrupts) - MICROWIRE/PLUS Serial peripheral interface - Multi-Input Wake-up - Software Trap n Idle Timer with programmable interrupt interval n 8-bit Stack Pointer SP (stack in RAM) n Two 8-bit Register Indirect Data Memory Pointers n True bit manipulation n WATCHDOG and Clock Monitor logic n Software selectable I/O options - TRI-STATE Output/High Impedance Input - Push-Pull Output - Weak Pull Up Input n Schmitt trigger inputs on I/O ports n Temperature range: 0°C to +70°C and ­40°C to +125°C (COP8SCE9) n Packaging: 44 PLCC, 44 LLP and 48 TSSOP COP8TM is a trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200327 DS200327 www.national.com COP8SBE9/SCE9 8-Bit CMOS Flash Based Microcontroller with 8k Memory, Virtual EEPROM and Brownout Reset PRELIMINARY COP8SBE9/SCE9 3.0 Block Diagram 20032763 4.0 Ordering Information Part Numbering Scheme COP8 SB E 9 H VA 8 Family and Feature Set Indicator Program Memory Size Program Memory Type No. Of Pins Package Type Temperature SB = Low Brownout Voltage SC = High Brownout Voltage www.national.com E = 8k 9 = Flash 2 H = 44 Pin I = 48 Pin LQ = LLP MT = TSSOP VA = PLCC 7 = -40 to +125°C 9 = 0 to +70°C 3 www.national.com COP8SBE9/SCE9 Table of Contents 1.0 General Description . 1 2.0 Features . 1 3.0 Block Diagram . 2 4.0 Ordering Information . 2 5.0 Connection Diagrams . 6 6.0 Architectural Overview . 8 6.1 EMI REDUCTION . 8 6.2 IN-SYSTEM PROGRAMMING AND VIRTUAL EEPROM . 8 6.3 DUAL CLOCK AND CLOCK DOUBLER . 8 6.4 TRUE IN-SYSTEM EMULATION . 8 6.5 ARCHITECTURE . 8 6.6 INSTRUCTION SET . 8 6.6.1 Key Instruction Set Features . 8 6.6.2 Single Byte/Single Cycle Code Execution . 8 6.6.3 Many Single-Byte, Multi-Function Instructions . 8 6.6.4 Bit-Level Control . 9 6.6.5 Register Set . 9 6.7 PACKAGING/PIN EFFICIENCY . 9 7.0 Absolute Maximum Ratings . 10 8.0 Electrical Characteristics . 10 9.0 Pin Descriptions . 15 9.1 EMULATION CONNECTION . 16 10.0 Functional Description . 18 10.1 CPU REGISTERS . 18 10.2 PROGRAM MEMORY . 18 10.3 DATA MEMORY . 18 10.4 DATA MEMORY SEGMENT RAM EXTENSION . 18 10.4.1 Virtual EEPROM . 19 10.5 OPTION REGISTER . 19 10.6 SECURITY . 20 10.7 RESET . 20 10.7.1 External Reset . 21 10.7.2 On-Chip Brownout Reset . 21 10.8 OSCILLATOR CIRCUITS . 23 10.8.1 Oscillator . 23 10.8.2 Clock Doubler . 24 10.9 CONTROL REGISTERS . 24 10.9.1 CNTRL Register (Address X'00EE) . 24 10.9.2 PSW Register (Address X'00EF) . 24 10.9.3 ICNTRL Register (Address X'00E8) . 24 10.9.4 T2CNTRL Register (Address X'00C6) . 24 10.9.5 HSTCR Register (Address X'00AF) . 24 10.9.6 ITMR Register (Address X'00CF) . 25 11.0 In-System Programming . 25 11.1 INTRODUCTION . 25 11.2 FUNCTIONAL DESCRIPTION . 25 11.3 REGISTERS . 25 11.3.1 ISP Address Registers . 25 11.3.2 ISP Read Data Register . 25 11.3.3 ISP Write Data Register . 26 11.3.4 ISP Write Timing Register . 26 11.4 MANEUVERING BACK AND FORTH BETWEEN FLASH MEMORY AND BOOT ROM . 27 11.5 FORCED EXECUTION FROM BOOT ROM . 27 11.6 RETURN TO FLASH MEMORY WITHOUT HARDWARE RESET . 28 11.7 MICROWIRE/PLUS ISP . 28 11.8 USER ISP AND VIRTUAL E2 . 28 11.9 RESTRICTIONS ON SOFTWARE WHEN CALLING ISP ROUTINES IN BOOT ROM . 31 11.10 FLASH MEMORY DURABILITY CONSIDERATIONS . 31 12.0 Timers . 32 12.1 TIMER T0 (IDLE TIMER) . 32 12.1.1 ITMR Register . 32 12.2 TIMER T1 AND TIMER T2 . 33 COP8SBE9/SCE9 Table of Contents (Continued) 12.2.1 Timer Operating Speeds . 12.2.2 Mode 1. Processor Independent PWM Mode . 12.2.3 Mode 2. External Event Counter Mode . 12.2.4 Mode 3. Input Capture Mode . 12.3 TIMER CONTROL FLAGS . 13.0 Power Saving Features . 13.1 POWER SAVE MODE CONTROL REGISTER . 13.2 OSCILLATOR STABILIZATION . 13.3 HIGH SPEED MODE OPERATION . 13.3.1 High Speed Halt Mode . 13.3.1.1 Entering The High Speed Halt Mode . 13.3.1.2 Exiting The High Speed Halt Mode . 13.3.1.3 HALT Exit Using Reset . 13.3.1.4 HALT Exit Using Multi-Input Wake-up . 13.3.1.5 Options . 13.3.2 High Speed Idle Mode . 13.4 DUAL CLOCK MODE OPERATION . 13.4.1 Dual Clock HALT Mode . 13.4.1.1 Entering The Dual Clock Halt Mode . 13.4.1.2 Exiting The Dual Clock Halt Mode . 13.4.1.3 HALT Exit Using Reset . 13.4.1.4 HALT Exit Using Multi-Input Wake-up . 13.4.1.5 Options . 13.4.2 Dual Clock Idle Mode . 13.5 LOW SPEED MODE OPERATION . 13.5.1 Low Speed HALT Mode . 13.5.1.1 Entering The Low Speed Halt Mode . 13.5.1.2 Exiting The Low Speed Halt Mode . 13.5.1.3 HALT Exit Using Reset . 13.5.1.4 HALT Exit Using Multi-Input Wake-up . 13.5.1.5 Options . 13.5.2 Low Speed Idle Mode . 13.6 MULTI-INPUT WAKE-UP . 14.0 USART . 14.1 USART CONTROL AND STATUS REGISTERS . 14.2 DESCRIPTION OF USART REGISTER BITS . 14.3 ASSOCIATED I/O PINS . 14.4 USART OPERATION . 14.4.1 Asynchronous Mode . 14.4.2 Synchronous Mode . 14.5 FRAMING FORMATS . 14.6 USART INTERRUPTS . 14.7 BAUD CLOCK GENERATION . 14.8 EFFECT OF HALT/IDLE . 14.9 DIAGNOSTIC . 14.10 ATTENTION MODE . 14.11 BREAK GENERATION . 15.0 Interrupts . 15.1 INTRODUCTION . 15.2 MASKABLE INTERRUPTS . 15.3 VIS INSTRUCTION . 15.3.1 VIS Execution . 15.4 NON-MASKABLE INTERRUPT . 15.4.1 Pending Flag . 15.4.2 Software Trap . 15.4.2.1 Programming Example: External Interrupt . 15.5 PORT L INTERRUPTS . 15.6 INTERRUPT SUMMARY . 16.0 WATCHDOG/Clock Monitor . 16.1 CLOCK MONITOR . 16.2 WATCHDOG/CLOCK MONITOR OPERATION . www.national.com 4 33 33 34 34 35 36 36 37 37 37 37 37 37 37 38 38 39 39 39 39 39 39 39 39 40 40 40 40 40 40 40 40 42 42 43 43 44 45 45 45 45 46 46 48 48 48 48 49 49 49 50 51 52 52 52 53 54 54 54 55 55 (Continued) 16.3 WATCHDOG AND CLOCK MONITOR SUMMARY . 16.4 DETECTION OF ILLEGAL CONDITIONS . 17.0 MICROWIRE/PLUS . 17.1 MICROWIRE/PLUS OPERATION . 17.1.1 MICROWIRE/PLUS Master Mode Operation . 17.1.2 MICROWIRE/PLUS Slave Mode Operation . 17.1.2.1 Alternate SK Phase Operation and SK Idle Polarity . 18.0 Memory Map . 19.0 Instruction Set . 19.1 INTRODUCTION . 19.2 INSTRUCTION FEATURES . 19.3 ADDRESSING MODES . 19.3.1 Operand Addressing Modes . 19.3.2 Tranfer-of-Control Addressing Modes . 19.4 INSTRUCTION TYPES . 19.4.1 Arithmetic Instructions . 19.4.2 Transfer-of-Control Instructions . 19.4.3 Load and Exchange Instructions . 19.4.4 Logical Instructions . 19.4.5 Accumulator Bit Manipulation Instructions . 19.4.6 Stack Control Instructions . 19.4.7 Memory Bit Manipulation Instructions . 19.4.8 Conditional Instructions . 19.4.9 No-Operation Instruction . 19.5 REGISTER AND SYMBOL DEFINITION . 19.6 INSTRUCTION SET SUMMARY . 19.7 INSTRUCTION EXECUTION TIME . 20.0 Development Support . 20.1 TOOLS ORDERING NUMBERS FOR THE COP8 FLASH FAMILY DEVICES . 20.2 COP8 TOOLS OVERVIEW . 20.3 WHERE TO GET TOOLS . 21.0 Revision History . 22.0 Physical Dimensions . 5 56 56 56 57 57 57 58 59 60 60 60 60 60 61 62 62 62 62 63 63 63 63 63 63 63 64 65 68 68 70 71 72 73 www.national.com COP8SBE9/SCE9 Table of Contents COP8SBE9/SCE9 5.0 Connection Diagrams 20032764 Top View Plastic Chip Package See NS Package Number V44A 20032759 Top View TSSOP Package See NS Package Number MTD48 MTD48 20032755 Top View LLP Package See NS Package Number LQA44A LQA44A www.national.com 6 Port Type Alt. Function In System Emulation Mode 44-Pin LLP 44-Pin PLCC 48-Pin TSSOP L0 I/O MIWU or Low Speed OSC In 16 11 11 L1 I/O MIWU or CKX or Low Speed OSC Out 17 12 12 L2 I/O MIWU or TDX 18 13 13 L3 I/O MIWU or RDX 19 14 14 L4 I/O MIWU or T2A 20 15 15 L5 I/O MIWU or T2B 21 16 16 L6 I/O MIWU 22 17 17 L7 I/O MIWU 23 18 18 G0 I/O INT 7 2 2 Input a G1 I/O WDOUT POUT 8 3 3 G2 I/O T1B Output 9 4 4 G3 I/O T1A Clock 10 5 5 G4 I/O SO 11 6 6 G5 I/O SK 12 7 7 G6 I SI 13 8 8 G7 I CKO 14 9 9 H0 I/O 42 37 41 H1 I/O 43 38 42 H2 I/O 44 39 43 H3 I/O 1 40 44 H4 I/O 2 41 45 H5 I/O 3 42 46 H6 I/O 4 43 47 H7 I/O 5 44 48 A0 I/O A1 I/O A2 I/O 36 31 35 A3 I/O 37 32 36 A4 I/O 38 33 37 A5 I/O 39 34 38 A6 I/O 40 35 39 A7 I/O 41 36 40 B0 I/O 24 19 19 B1 I/O 25 20 20 B2 I/O 26 21 21 B3 I/O 27 22 22 B4 I/O 28 23 23 B5 I/O 29 24 24 B6 I/O 30 25 25 B7 I/O 31 26 26 33 34 DVCC VCC 35 30 32 DGND GND 32 27 27 15 10 10 6 1 1 CKI I RESET I RESET a. G1 operation as WDOUT is controlled by Option Register bit 2. 7 www.national.com COP8SBE9/SCE9 Pinouts for 44- and 48-Pin Packages COP8SBE9/SCE9 be bypassed by jumpers on the final application board, can provide for software and hardware debugging using actual production units. 6.0 Architectural Overview 6.1 EMI REDUCTION The COP8SBE9/SCE9 devices incorporate circuitry that guards against electromagnetic interference - an increasing problem in today's microcontroller board designs. National's patented EMI reduction technology offers low EMI clock circuitry, gradual turn-on output drivers (GTOs) and internal Icc smoothing filters, to help circumvent many of the EMI issues influencing embedded control designs. National has achieved 15 dB­20 dB reduction in EMI transmissions when designs have incorporated its patented EMI reducing circuitry. 6.5 ARCHITECTURE The COP8 family is based on a modified Harvard architecture, which allows data tables to be accessed directly from program memory. This is very important with modern microcontroller-based applications, since program memory is usually ROM or EPROM, while data memory is usually RAM. Consequently constant data tables need to be contained in non-volatile memory, so they are not lost when the microcontroller is powered down. In a modified Harvard architecture, instruction fetch and memory data transfers can be overlapped with a two stage pipeline, which allows the next instruction to be fetched from program memory while the current instruction is being executed using data memory. This is not possible with a Von Neumann single-address bus architecture. 6.2 IN-SYSTEM PROGRAMMING AND VIRTUAL EEPROM The device includes a program in a boot ROM that provides the capability, through the MICROWIRE/PLUS serial interface, to erase, program and read the contents of the Flash memory. Additional routines are included in the boot ROM, which can be called by the user program, to enable the user to customize in system software update capability if MICROWIRE/ PLUS is not desired. Additional functions will copy blocks of data between the RAM and the Flash Memory. These functions provide a virtual EEPROM capability by allowing the user to emulate a variable amount of EEPROM by initializing nonvolatile variables from the Flash Memory and occasionally restoring these variables to the Flash Memory. The contents of the boot ROM have been defined by National. Execution of code from the boot ROM is dependent on the state of the FLEX bit in the Option Register on exit from RESET. If the FLEX bit is a zero, the Flash Memory is assumed to be empty and execution from the boot ROM begins. For further information on the FLEX bit, refer to Section 4.5, Option Register. The COP8 family supports a software stack scheme that allows the user to incorporate many subroutine calls. This capability is important when using High Level Languages. With a hardware stack, the user is limited to a small fixed number of stack levels. 6.6 INSTRUCTION SET In today's 8-bit microcontroller application arena cost/ performance, flexibility and time to market are several of the key issues that system designers face in attempting to build well-engineered products that compete in the marketplace. Many of these issues can be addressed through the manner in which a microcontroller's instruction set handles processing tasks. And that's why the COP8 family offers a unique and code-efficient instruction set - one that provides the flexibility, functionality, reduced costs and faster time to market that today's microcontroller based products require. Code efficiency is important because it enables designers to pack more on-chip functionality into less program memory space (ROM, OTP or Flash). Selecting a microcontroller with less program memory size translates into lower system costs, and the added security of knowing that more code can be packed into the available program memory space. 6.3 DUAL CLOCK AND CLOCK DOUBLER The device includes a versatile clocking system and two oscillator circuits designed to drive a crystal or ceramic resonator. The primary oscillator operates at high speed up to 10 MHz. The secondary oscillator is optimized for operation at 32.768 kHz. The user can, through specified transition sequences (please refer to Section 13.0 Power Saving Features), switch execution between the high speed and low speed oscillators. The unused oscillator can then be turned off to minimize power dissipation. If the low speed oscillator is not used, the pins are available as general purpose bidirectional ports. The operation of the CPU will use a clock at twice the frequency of the selected oscillator (up to 20 MHz for high speed operation and 65.536 kHz for low speed operation). This doubled clock will be referred to in this document as `MCLK'. The frequency of the selected oscillator will be referred to as CKI. Instruction execution occurs at one tenth the selected MCLK rate. 6.6.1 Key Instruction Set Features The COP8 family incorporates a unique combination of instruction set features, which provide designers with optimum code efficiency and program memory utilization. 6.6.2 Single Byte/Single Cycle Code Execution The efficiency is due to the fact that the majority of instructions are of the single byte variety, resulting in minimum program space. Because compact code does not occupy a substantial amount of program memory space, designers can integrate additional features and functionality into the microcontroller program memory space. Also, the majority instructions executed by the device are single cycle, resulting in minimum program execution time. In fact, 77% of the instructions are single byte single cycle, providing greater code and I/O efficiency, and faster code execution. 6.4 TRUE IN-SYSTEM EMULATION On-chip emulation capability has been added which allows the user to perform true in-system emulation using final production boards and devices. This simplifies testing and evaluation of software in real environmental conditions. The user, merely by providing for a standard connector which can www.national.com 6.6.3 Many Single-Byte, Multi-Function Instructions The COP8 instruction set utilizes many single-byte, multifunction instructions. This enables a single instruction to accomplish multiple functions, such as DRSZ, DCOR, JID, LD (Load) and X (Exchange) instructions with postincrementing and post-decrementing, to name just a few 8 board space. All members of the COP8 family provide the ability to set, reset and test any individual bit in the data memory address space, including memory-mapped I/O ports and associated registers. (Continued) examples. In many cases, the instruction set can simultaneously execute as many as three functions with the same single-byte instruction. JID: (Jump Indirect); Single byte instruction decodes external events and jumps to corresponding service routines (analogous to "DO CASE" statements in higher level languages). LAID: (Load Accumulator-Indirect); Single byte look up table instruction provides efficient data path from the program memory to the CPU. This instruction can be used for table lookup and to read the entire program memory for checksum calculations. 6.6.5 Register Set Three memory-mapped pointers handle register indirect addressing and software stack pointer functions. The memory data pointers allow the option of post-incrementing or postdecrementing with the data movement instructions (LOAD/ EXCHANGE). And 15 memory-mapped registers allow designers to optimize the precise implementation of certain specific instructions. 6.7 PACKAGING/PIN EFFICIENCY RETSK: (Return Skip); Single byte instruction allows return from subroutine and skips next instruction. Decision to branch can be made in the subroutine itself, saving code. AUTOINC/DEC: (Auto-Increment/Auto-Decrement); These instructions use the two memory pointers B and X to efficiently process a block of data (simplifying "FOR NEXT" or other loop structures in higher level languages). Real estate and board configuration considerations demand maximum space and pin efficiency, particularly given today's high integration and small product form factors. Microcontroller users try to avoid using large packages to get the I/O needed. Large packages take valuable board space and increase device cost, two trade-offs that microcontroller designs can ill afford. The COP8 family offers a wide range of packages and does not waste pins. 6.6.4 Bit-Level Control Bit-level control over many of the microcontroller's I/O ports provides a flexible means to ease layout concerns and save 9 www.national.com COP8SBE9/SCE9 6.0 Architectural Overview COP8SBE9/SCE9 7.0 Absolute Maximum Ratings (Note Total Current out of GND Pin (Sink) 1) Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Protection Level Supply Voltage (VCC) Voltage at Any Pin -65°C to +140°C 2 kV (Human Body Model) Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications are not ensured when operating the device at absolute maximum ratings. 7V -0.3V to VCC +0.3V Total Current into VCC Pin (Source) 100 mA 100 mA 8.0 Electrical Characteristics DC Electrical Characteristics (0°C TA +70°C) Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Parameter Conditions Min Typ Max Units Operating Voltage 2.7 5.5 V Power Supply Rise Time 10 50 x 106 ns 0.1 VCC V Power Supply Ripple (Note 2) Peak-to-Peak Supply Current (Note 3) High Speed Mode CKI = 10 MHz VCC = 5.5V, tC = 0.5 µs 13.2 mA CKI = 3.33 MHz VCC = 4.5V, tC = 1.5 µs 6 mA CKI = 10 MHz, Low Speed OSC = 32 kHz VCC = 5.5V, tC = 0.5 µs 13.2 mA CKI = 3.33 MHz, Low Speed OSC = 32 kHz VCC = 4.5V, tC = 1.5 µs 6 mA Dual Clock Mode Low Speed Mode Low Speed OSC = 32 kHz VCC = 5.5V 60 103 µA High Speed Mode VCC = 5.5V, CKI = 0 MHz VCC (the pins do not have source current when biased at a voltage below VCC). These two pins will not latch up. The voltage at the pins must be limited to < 14V. WARNING: Voltages in excess of 14V will cause damage to the pins. This warning excludes ESD transients. Note 6: If timer is in high speed mode, the minimum time is 1 MCLK. If timer is not in high speed mode, the minimum time is 1 tC. Note 7: Absolute Maximum Ratings should not be exceeded. Note 8: Vcc must be valid and stable before G6 is raised to a high voltage. Note 9: Corresponds to 10 MHz maximum input clock frequency. Note 10: Corresponds to 3.33 MHz maximum input clock frequency. www.national.com 12 Parameter Conditions Operating Voltage Typ 4.5 Power Supply Rise Time Power Supply Ripple (Note 2) Min Max Units 5.5 10 50 x 10 Peak-to-Peak V 6 0.1 VCC ns V Supply Current (Note 3) High Speed Mode CKI = 10 MHz VCC = 5.5V, tC = 0.5 µs 14.5 mA CKI = 3.33 MHz VCC = 4.5V, tC = 1.5 µs 7.0 mA CKI = 10 MHz, Low Speed OSC = 32 kHz VCC = 5.5V, tC = 0.5 µs 14.5 mA CKI = 3.33 MHz, Low Speed OSC = 32 kHz VCC = 4.5V, tC = 1.5 µs 7.0 mA Dual Clock Mode Low Speed Mode Low Speed OSC = 32 kHz VCC = 5.5V 65 110 µA HALT Current with BOR Disabled (Note 4) High Speed Mode VCC = 5.5V, CKI = 0 MHz VCC (the pins do not have source current when biased at a voltage below VCC). These two pins will not latch up. The voltage at the pins must be limited to < (VCC + 7V. WARNING: Voltages in excess of 14V will cause damage to the pins. This warning excludes ESD transients. Note 15: If timer is in high speed mode, the minimum time is 1 MCLK. If timer is not in high speed mode, the minimum time is 1 tC. Note 16: Absolute Maximum Ratings should not be exceeded. Note 17: Vcc must be valid and stable before G6 is raised to a high voltage. www.national.com 14 COP8SBE9/SCE9 20032705 FIGURE 1. MICROWIRE/PLUS Timing dently configured as an input (Schmitt trigger inputs on ports L and G), output or TRI-STATE under program control. Three data memory address locations are allocated for each of these I/O ports. Each I/O port has three associated 8-bit memory mapped registers, the CONFIGURATION register, the output DATA register and the Pin input register. (See the memory map for the various addresses associated with the I/O ports.) Figure 3 shows the I/O port configurations. The DATA and CONFIGURATION registers allow for each port bit to be individually configured under software control as shown below: 9.0 Pin Descriptions The COP8SBE/SCE I/O structure enables designers to reconfigure the microcontroller's I/O functions with a single instruction. Each individual I/O pin can be independently configured as output pin low, output high, input with high impedance or input with weak pull-up device. A typical example is the use of I/O pins as the keyboard matrix input lines. The input lines can be programmed with internal weak pull-ups so that the input lines read logic high when the keys are all open. With a key closure, the corresponding input line will read a logic zero since the weak pull-up can easily be overdriven. When the key is released, the internal weak pull-up will pull the input line back to logic high. This eliminates the need for external pull-up resistors. The high current options are available for driving LEDs, motors and speakers. This flexibility helps to ensure a cleaner design, with less external components and lower costs. Below is the general description of all available pins. VCC and GND are the power supply pins. All VCC and GND pins must be connected. CONFIGURATION Register DATA Register 0 0 0 1 Input with Weak Pull-Up 1 0 Push-Pull Zero Output 1 1 Push-Pull One Output Port Set-Up Hi-Z Input (TRI-STATE Output) Port A is an 8-bit I/O port. All A pins have Schmitt triggers on the inputs. The 44-pin packages do not have a full 8-bit port and contain some unbonded, floating pads internally on the chip. The binary value read from these bits is undetermined. The application software should mask out these unknown bits when reading the Port A register, or use only bit-access program instructions when accessing Port A. These unconnected bits draw power only when they are addressed (i.e., in brief spikes). Port B is an 8-bit I/O port. All B pins have Schmitt triggers on the inputs. Port G is an 8-bit port. Pin G0, G2­G5 are bi-directional I/O ports. Pin G6 is always a general purpose Hi-Z input. All pins have Schmitt Triggers on their inputs. Pin G1 serves as the dedicated WATCHDOG output with weak pull-up if the WATCHDOG feature is selected by the Option register. The pin is a general purpose I/O if WATCHDOG feature is not selected. If WATCHDOG feature is selected, bit 1 of the Port G configuration and data register does not have any effect on Pin G1 setup. G7 serves as the dedicated output pin for the CKO clock output. Since G6 is an input only pin and G7 is the dedicated CKO clock output pin, the associated bits in the data and configuration registers for G6 and G7 are used for special purpose functions as outlined below. Reading the G6 and G7 data bits will return zeros. The device will be placed in the HALT mode by writing a "1" to bit 7 of the Port G Data Register. Similarly the device will be placed in the IDLE mode by writing a "1" to bit 6 of the Port G Data Register. Users of the LLP package are cautioned to be aware that the central metal area and the pin 1 index mark on the bottom of the package may be connected to GND. See figure below: 20032770 FIGURE 2. CKI is the clock input. This can be connected (in conjunction with CKO) to an external crystal circuit to form a crystal oscillator. See Oscillator Description section. RESET is the master reset input. See Reset description section. The device contains up to six bidirectional 8-bit I/O ports (A, B, G, H and L), where each individual bit may be indepen15 www.national.com COP8SBE9/SCE9 9.0 Pin Descriptions (Continued) Writing a "1" to bit 6 of the Port G Configuration Register enables the MICROWIRE/PLUS to operate with the alternate phase of the SK clock. The G7 configuration bit, if set high, enables the clock start up delay after HALT when the R/C clock configuration is used. Config. Reg. Data Reg. G7 CLKDLY HALT G6 Alternate SK IDLE Port G has the following alternate features: G7 CKO Oscillator dedicated output G6 SI (MICROWIRE/PLUS Serial Data Input) 20032761 G5 SK (MICROWIRE/PLUS Serial Clock) G4 SO (MICROWIRE/PLUS Serial Data Output) FIGURE 4. I/O Port Configurations - Output Mode G3 T1A (Timer T1 I/O) G2 T1B (Timer T1 Capture Input) G1 WDOUT WATCHDOG and/or Clock Monitor if WATCHDOG enabled, otherwise it is a general purpose I/O G0 INTR (External Interrupt Input) G0 through G3 are also used for In-System Emulation. Port H is an 8-bit I/O port. All H pins have Schmitt triggers on the inputs. Port L is an 8-bit I/O port. All L-pins have Schmitt triggers on the inputs. Port L supports the Multi-Input Wake-up feature on all eight pins. Port L has the following alternate pin functions: L7 Multi-Input Wake-up L6 Multi-Input Wake-up 20032762 L5 L4 L3 L2 L1 Multi-Input Wake-up or T2B (Timer T2B Input) Multi-input Wake-up or T2A (Timer T2A Input/Output) Multi-Input Wake-up and/or RDX (USART Receive) Multi-Input Wake-up or TDX (USART Transmit) Multi-Input Wake-up and/or CKX (USART Clock) (Low Speed Oscillator Output) L0 Multi-Input Wake-up (Low Speed Oscillator Input) FIGURE 5. I/O Port Configurations - Input Mode 9.1 EMULATION CONNECTION Connection to the emulation system is made via a 2 x 7 connector which interrupts the continuity of the RESET, G0, G1, G2 and G3 signals between the COP8 device and the rest of the target system (as shown in Figure 6). This connector can be designed into the production pc board and can be replaced by jumpers or signal traces when emulation is no longer necessary. The emulator will replicate all functions of G0 - G3 and RESET. For proper operation, no connection should be made on the device side of the emulator connector. 20032760 FIGURE 3. I/O Port Configurations www.national.com 16 COP8SBE9/SCE9 9.0 Pin Descriptions (Continued) 20032709 FIGURE 6. Emulation Connection 17 www.national.com COP8SBE9/SCE9 RAM address 06F Hex. The SP is decremented as items are pushed onto the stack. SP points to the next available location on the stack. 10.0 Functional Description The architecture of the device is a modified Harvard architecture. With the Harvard architecture, the program memory (Flash) is separate from the data store memory (RAM). Both Program Memory and Data Memory have their own separate addressing space with separate address buses. The architecture, though based on the Harvard architecture, permits transfer of data from Flash Memory to RAM. All the CPU registers are memory mapped with the exception of the Accumulator (A) and the Program Counter (PC). 10.2 PROGRAM MEMORY The program memory consists of 8192 bytes of Flash Memory. These bytes may hold program instructions or constant data (data tables for the LAID instruction, jump vectors for the JID instruction, and interrupt vectors for the VIS instruction). The program memory is addressed by the 15-bit program counter (PC). All interrupts in the device vector to program memory location 00FF Hex. The program memory reads 00 Hex in the erased state. Program execution starts at location 0 after RESET. If a Return instruction is executed when the SP contains 6F (hex), instruction execution will continue from Program Memory location 7FFF (hex). If location 7FFF is accessed by an instruction fetch, the Flash Memory will return a value of 00. This is the opcode for the INTR instruction and will cause a Software Trap. 10.1 CPU REGISTERS The CPU can do an 8-bit addition, subtraction, logical or shift operation in one instruction (tC) cycle time. There are six CPU registers: A is the 8-bit Accumulator Register PC is the 15-bit Program Counter Register PU is the upper 7 bits of the program counter (PC) PL is the lower 8 bits of the program counter (PC) B is an 8-bit RAM address pointer, which can be optionally post auto incremented or decremented. X is an 8-bit alternate RAM address pointer, which can be optionally post auto incremented or decremented. For the purpose of erasing and rewriting the Flash Memory, it is organized in pages of 64 bytes as show in Table 1. S is the 8-bit Data Segment Address Register used to extend the lower half of the address range (00 to 7F) into 256 data segments of 128 bytes each. SP is the 8-bit stack pointer, which points to the subroutine/ interrupt stack (in RAM). With reset the SP is initialized to TABLE 1. Available Memory Address Ranges Device Program Memory Size (Flash) COP8SBE9 COP8SCE9 8192 64 1FFF 10.3 DATA MEMORY Segments Available Maximum RAM Address (HEX) 0-1 017F The data store memory is either addressed directly by a single byte address within the instruction, or indirectly relative to the reference of the B, X, or SP pointers (each contains a single-byte address). This single-byte address allows an addressing range of 256 locations from 00 to FF hex. The upper bit of this single-byte address divides the data store memory into two separate sections as outlined previously. With the exception of the RAM register memory from address locations 00F0 ­ 00FF, all RAM memory is memory mapped with the upper bit of the single-byte address being equal to zero. This allows the upper bit of the single-byte address to determine whether or not the base address range (from 0000 ­ 00FF) is extended. If this upper bit equals one (representing address range 0080 ­ 00FF), then address extension does not take place. Alternatively, if this upper bit equals zero, then the data segment extension register S is used to extend the base address range from 0000 ­ 007F to XX00 ­ XX7F, where XX represents the 8 bits from the S register. Thus the 128-byte data segment extensions are located from addresses 0100 ­ 017F for data segment 1, 0200 ­ 027F for data segment 2, etc., up to FF00 ­ FF7F for data segment 255. The base address range from 0000 ­ 007F represents data segment 0. Refer to Table 1, to determine available RAM segments for this device. Figure 7 illustrates how the S register data memory extension is used in extending the lower half of the base address The data memory address space includes the on-chip RAM and data registers, the I/O registers (Configuration, Data and Pin), the control registers, the MICROWIRE/PLUS SIO shift register, and the various registers, and counters associated with the timers and the USART (with the exception of the IDLE timer). Data memory is addressed directly by the instruction or indirectly by the B, X and SP pointers. The data memory consists of 256 bytes of RAM. Sixteen bytes of RAM are mapped as "registers" at addresses 0F0 to 0FF Hex. These registers can be loaded immediately, and also decremented and tested with the DRSZ (decrement register and skip if zero) instruction. The memory pointer registers X, SP, B and S are memory mapped into this space at address locations 0FC to 0FF Hex respectively, with the other registers being available for general usage. The instruction set permits any bit in memory to be set, reset or tested. All I/O and registers (except A and PC) are memory mapped; therefore, I/O bits and register bits can be directly and individually set, reset and tested. The accumulator (A) bits can also be directly and individually tested. Note: RAM contents are undefined upon power-up. 10.4 DATA MEMORY SEGMENT RAM EXTENSION Data memory address 0FF is used as a memory mapped location for the Data Segment Address Register (S). www.national.com Data Memory Size (RAM) 256 Flash Memory Option Register Page Size Address (Hex) (Bytes) 18 stack (used with subroutine linkage and interrupts) is always located in the base segment. The stack pointer will be initialized to point at data memory location 006F as a result of reset. (Continued) range (00 to 7F hex) into 256 data segments of 128 bytes each, with a total addressing range of 32 kbytes from XX00 to XX7F. This organization allows a total of 256 data segments of 128 bytes each with an additional upper base segment of 128 bytes. Furthermore, all addressing modes are available for all data segments. The S register must be changed under program control to move from one data segment (128 bytes) to another. However, the upper base segment (containing the 16 memory registers, I/O registers, control registers, etc.) is always available regardless of the contents of the S register, since the upper base segment (address range 0080 to 00FF) is independent of data segment extension. The instructions that utilize the stack pointer (SP) always reference the stack as part of the base segment (Segment 0), regardless of the contents of the S register. The S register is not changed by these instructions. Consequently, the The 128 bytes of RAM contained in the base segment are split between the lower and upper base segments. The first 112 bytes of RAM are resident from address 0000 to 006F in the lower base segment, while the remaining 16 bytes of RAM represent the 16 data memory registers located at addresses 00F0 to 00FF of the upper base segment. No RAM is located at the upper sixteen addresses (0070 to 007F) of the lower base segment. Additional RAM beyond these initial 128 bytes, however, will always be memory mapped in groups of 128 bytes (or less) at the data segment address extensions (XX00 to XX7F) of the lower base segment. The additional 128 bytes of RAM in this device are memory mapped at address locations 0100 through 017F. 20032710 FIGURE 7. RAM Organization 10.4.1 Virtual EEPROM The Flash memory and the User ISP functions (see Section 5.7), provide the user with the capability to use the flash program memory to back up user defined sections of RAM. This effectively provides the user with the same nonvolatile data storage as EEPROM. Management, and even the amount of memory used, are the responsibility of the user, however the flash memory read and write functions have been provided in the boot ROM. One typical method of using the Virtual EEPROM feature would be for the user to copy the data to RAM during system initialization, periodically, and if necessary, erase the page of Flash and copy the contents of the RAM back to the Flash. 10.5 OPTION REGISTER The Option register, located at address 0x3FFF (hex) in the Flash Program Memory, is used to configure the user selectable security, WATCHDOG, and HALT options. The register can be programmed only in external Flash Memory programming or ISP Programming modes. Therefore, the register must be programmed at the same time as the program memory. The contents of the Option register shipped from the factory read 00 Hex. The format of the Option register is as follows: Bit 7 Bit 6 Reserved Bit 5 SECURITY Bit 4 Bit 3 Reserved Bit 2 Bit 1 Bit 0 WATCH DOG HALT FLEX Bits 7, 6 These bits are reserved and must be 0. 19 www.national.com COP8SBE9/SCE9 10.0 Functional Description COP8SBE9/SCE9 10.0 Functional Description enforced by the user when the contents of the Flash Memory are accessed via the user ISP or Virtual EEPROM capability. If the security feature is enabled, then any attempt to externally read the contents of the Flash Memory will result in the value FF (hex) being read from all program locations (except the Option Register). In addition, with the security feature enabled, the write operation to the Flash program memory and Option Register is inhibited. Page Erases are also inhibited when the security feature is enabled. The Option Register is readable regardless of the state of the security bit by accessing location FFFF (hex). Mass Erase Operations are possible regardless of the state of the security bit. (Continued) Bit 5 =1 Security enabled. Flash Memory read and write are not allowed except in User ISP/Virtual E2 commands. Mass Erase is allowed. =0 Security disabled. Flash Memory read and write are allowed. Bits 4, 3 These bits are reserved and must be 0. Bit 2 =1 =0 WATCHDOG feature disabled. G1 is a general purpose I/O. WATCHDOG feature enabled. G1 pin is WATCHDOG output with weak pullup. Bit 1 =1 Note: The actual memory address of the Option Register is 0x3FFF (hex), however the MICROWIRE/PLUS ISP routines require the address FFFF (hex) to be used to read the Option Register when the Flash Memory is secured. HALT mode disabled. =0 The security bit can be erased only by a Mass Erase of the entire contents of the Flash unless Flash operation is under the control of User ISP functions. HALT mode enabled. Bit 0 =1 =0 The entire Option Register must be programmed at one time and cannot be rewritten without first erasing the entire last page of Flash Memory. Execution following RESET will be from Flash Memory. Flash Memory is erased. Execution following RESET will be from Boot ROM with the MICROWIRE/ PLUS ISP routines. 10.7 RESET The device is initialized when the RESET pin is pulled low or the On-chip Brownout Reset is activated. The COP8 assembler defines a special ROM section type, CONF, into which the Option Register data may be coded. The Option Register is programmed automatically by programmers that are certified by National. The user needs to ensure that the FLEX bit will be set when the device is programmed. The following examples illustrate the declaration of the Option Register. Syntax: [label:].sect config, conf .db value ;1 byte, ;configures ;options .endsect Example: The following sets a value in the Option Register and User Identification for a COP8SBE9HVA7. The Option Register bit values shown select options: Security disabled, WATCHDOG enabled HALT mode enabled and execution will commence from Flash Memory. .chip 8SBE .sect option, conf .db 0x01 ;wd, halt, flex .endsect . .end start Note: All programmers certified for programming this family of parts will support programming of the Option Register. Please contact National or your device programmer supplier for more information. 20032711 FIGURE 8. Reset Logic The following occurs upon initialization: Port A: TRI-STATE (High Impedance Input) Port B: TRI-STATE (High Impedance Input) Port G: TRI-STATE (High Impedance Input). Exceptions: If Watchdog is enabled, then G1 is Watchdog output. G0 and G2 have their weak pull-up enabled during RESET. Port H: TRI-STATE (High Impedance Input) Port L: TRI-STATE (High Impedance Input) PC: CLEARED to 0000 PSW, CNTRL and ICNTRL registers: CLEARED SIOR: UNAFFECTED after RESET with power already applied RANDOM after RESET at power-on T2CNTRL: CLEARED HSTCR: CLEARED ITMR: Cleared except Bit 6 (HSON) = 1 Accumulator, Timer 1 and Timer 2: RANDOM after RESET WKEN, WKEDG: CLEARED WKPND: RANDOM SP (Stack Pointer): Initialized to RAM address 06F Hex B and X Pointers: 10.6 SECURITY The device has a security feature which, when enabled, prevents external reading of the Flash program memory. The security bit in the Option Register determines, whether security is enabled or disabled. If the security feature is disabled, the contents of the internal Flash Memory may be read by external programmers or by the built in MICROWIRE/PLUS serial interface ISP. Security must be www.national.com 20 RESET may also be used to cause an exit from the HALT mode. (Continued) A recommended reset circuit for this device is shown in Figure 9. UNAFFECTED after RESET with power already applied RANDOM after RESET at power-on S Register: CLEARED RAM: UNAFFECTED after RESET with power already applied RANDOM after RESET at power-on USART: PSR, ENU, ENUR, ENUI: Cleared except the TBMT bit which is set to one. ISP CONTROL: ISPADLO: CLEARED 20032712 ISPADHI: CLEARED PGMTIM: PRESET TO VALUE FOR 10 MHz CKI WATCHDOG (if enabled): The device comes out of reset with both the WATCHDOG logic and the Clock Monitor detector armed, with the WATCHDOG service window bits set and the Clock Monitor bit set. The WATCHDOG and Clock Monitor circuits are inhibited during reset. The WATCHDOG service window bits being initialized high default to the maximum WATCHDOG service window of 64k T0 clock cycles. The Clock Monitor bit being initialized high will cause a Clock Monitor error following reset if the clock has not reached the minimum specified frequency at the termination of reset. A Clock Monitor error will cause an active low error output on pin G1. This error output will continue until 16­32 T0 clock cycles following the clock frequency reaching the minimum specified value, at which time the G1 output will go high. FIGURE 9. Reset Circuit Using External Reset 10.7.2 On-Chip Brownout Reset The device generates an internal reset as VCC rises. While VCC is less than the specified brownout voltage (Vbor), the device is held in the reset condition and the Idle Timer is preset with 00Fx (240­256 tC). When VCC reaches a value greater than Vbor, the Idle Timer starts counting down. Upon underflow of the Idle Timer, the internal reset is released and the device will start executing instructions. This internal reset will perform the same functions as external reset. Once VCC is above Vbor and this initial Idle Timer time-out takes place, instruction execution begins and the Idle Timer can be used normally. If, however, VCC drops below the selected Vbor, an internal reset is generated, and the Idle Timer is preset with 00Fx. The device now waits until VCC is greater than Vbor and the countdown starts over. When enabled, the functional operation of the device, at frequency, is guaranteed down to the Vbor level. 10.7.1 External Reset The RESET input, when pulled low, initializes the device. The RESET pin must be held low for a minimum of one instruction cycle to guarantee a valid reset. 21 www.national.com COP8SBE9/SCE9 10.0 Functional Description COP8SBE9/SCE9 10.0 Functional Description (Continued) 20032713 FIGURE 10. Brownout Reset Operation filtering of VCC be done to ensure that the brownout feature works correctly. Power supply decoupling is vital even in battery powered systems. There are two optional brownout voltages. The part numbers for the two versions of this device are: COP8SBE, Vbor = low voltage range COP8SCE, Vbor = high voltage range Refer to the device specifications for the actual Vbor voltages. High brownout voltage devices are guaranteed to operate at 10MHz down to the high brownout voltage. Low brownout voltage devices are guaranteed to operate at 3.33MHz down to the low brownout voltage. Low brownout voltage devices are not guaranteed to operate at 10MHz down to the low brownout voltage. Under no circumstances should the RESET pin be allowed to float. If only the on-chip Brownout Reset feature is being used, the RESET pin should be connected directly to VCC. The RESET input may also be connected to an external pull-up resistor or to other external circuitry. The output of the brownout reset detector will always preset the Idle Timer to a value between 00F0 and 00FF (240 to 256 tC). At this time, the internal reset will be generated. The contents of data registers and RAM are unknown following the on-chip reset. One exception to the above is that the brownout circuit will insert a delay of approximately 3 ms on power up or any time VCC drops below a voltage of about 1.8V. The device will be held in Reset for the duration of this delay before the Idle Timer starts counting the 240 to 256 tC. This delay starts as soon as the VCC rises above the trigger voltage (approximately 1.8V). This behavior is shown in Figure 10. In Case 1, VCC rises from 0V and the on-chip RESET is undefined until the supply is greater than approximately 1.0V. At this time the brownout circuit becomes active and holds the device in RESET. As the supply passes a level of about 1.8V, a delay of about 3 ms (td) is started and the Idle Timer is preset to a value between 00F0 and 00FF (hex). Once VCC is greater than Vbor and td has expired, the Idle Timer is allowed to count down (tid). Case 2 shows a subsequent dip in the supply voltage which goes below the approximate 1.8V level. As VCC drops below Vbor, the internal RESET signal is asserted. When VCC rises back above the 1.8V level, td is started. Since the power supply rise time is longer for this case, td has expired before VCC rises above Vbor and tid starts immediately when VCC is greater than Vbor. Case 3 shows a dip in the supply where VCC drops below Vbor, but not below 1.8V. On-chip RESET is asserted when VCC goes below Vbor and tid starts as soon as the supply goes back above Vbor. The internal reset will not be turned off until the Idle Timer underflows. The internal reset will perform the same functions as external reset. The device is guaranteed to operate at the specified frequency down to the specified brownout voltage. After the underflow, the logic is designed such that no additional internal resets occur as long as VCC remains above the brownout voltage. The device is relatively immune to short duration negativegoing VCC transients (glitches). It is essential that good www.national.com 22 Section 7.0 Power Saving Features. The low speed oscillator utilizes the L0 and L1 port pins. References in the following text to CKI will also apply to L0 and references to G7/CKO will also apply to L1. (Continued) 10.8.1 Oscillator CKI is the clock input while G7/CKO is the clock generator output to the crystal. An on-chip bias resistor connected between CKI and CKO is provided to reduce system part count. The value of the resistor is in the range of 0.5M to 2M (typically 1.0M). Table 2 shows the component values required for various standard crystal values. Resistor R2 is on-chip, for the high speed oscillator, and is shown for reference. Figure 12 shows the crystal oscillator connection diagram. A ceramic resonator of the required frequency may be used in place of a crystal if the accuracy requirements are not quite as strict. 20032714 FIGURE 11. Reset Circuit Using Power-On Reset 10.8 OSCILLATOR CIRCUITS The device has two crystal oscillators to facilitate low power operation while maintaining throughput when required. Further information on the use of the two oscillators is found in High Speed Oscillator Low Speed Oscillator 20032716 20032715 FIGURE 12. Crystal Oscillator C2 can be trimmed to obtain the desired frequency. C2 should be less than or equal to C1. Note: The low power design of the low speed oscillator makes it extremely sensitive to board layout and load capacitance. The user should place the crystal and load capacitors within 1cm. of the device and must ensure that the above equation for load capacitance is strictly followed. If these conditions are not met, the application may have problems with startup of the low speed oscillator. TABLE 2. Crystal Oscillator Configuration, TA = 25°C, VCC = 5V R1 (k) R2 (M) C1 (pF) C2 (pF) CKI Freq. (MHz) 0 On Chip 18 18 10 0 On Chip 18 18 5 0 On Chip 18­36 18­36 1 5.6 On Chip 100 100­156 0.455 0 20 * * 32.768 kHz* TABLE 3. Startup Times CKI Frequency 1­10 ms 3.33 MHz The crystal and other oscillator components should be placed in close proximity to the CKI and CKO pins to minimize printed circuit trace length. The values for the external capacitors should be chosen to obtain the manufacturer's specified load capacitance for the crystal when combined with the parasitic capacitance of the trace, socket, and package (which can vary from 0 to 8 pF). The guideline in choosing these capacitors is: Manufacturer's specified load cap = (C1 * C2) / (C1 + C2) + Cparasitic Startup Time 10 MHz *Applies to connection to low speed oscillator on port pins L0 and L1 only. *See Note below. 3­10 ms 1 MHz 10­30 ms 32 kHz (low speed oscillator) 23 3­20 ms 455 kHz 2­5 sec www.national.com COP8SBE9/SCE9 10.0 Functional Description COP8SBE9/SCE9 10.0 Functional Description 10.9.3 ICNTRL Register (Address X'00E8) (Continued) Unused 10.8.2 Clock Doubler This device contains a frequency doubler that doubles the frequency of the oscillator selected to operate the main microcontroller core. The details of how to select either the high speed oscillator or low speed oscillator are described in, Power Saving Features. When the high speed oscillator connected to CKI operates at 10 MHz, the internal clock frequency is 20 MHz, resulting in an instruction cycle time of 0.5 µs. When the 32 kHz oscillator connected to L0 and L1 is selected, the internal clock frequency is 64 kHz, resulting in an instruction cycle of 152.6 µs. The output of the clock doubler is called MCLK and is referenced in many places within this document. T1C1 T0EN µWPND µWEN T1PNDB T1ENB T1C0 Bit 0 T0EN Timer T0 Interrupt Enable (Bit 12 toggle) µWPND MICROWIRE/PLUS interrupt pending µWEN Enable MICROWIRE/PLUS interrupt T1PNDB Timer T1 Interrupt Pending Flag for T1B capture edge T1ENB Timer T1 Interrupt Enable for T1B Input capture edge 10.9.4 T2CNTRL Register (Address X'00C6) 10.9.1 CNTRL Register (Address X'00EE) T1C2 T0PND The ICNTRL register contains the following bits: LPEN L Port Interrupt Enable (Multi-Input Wake-up/Interrupt) T0PND Timer T0 Interrupt pending 10.9 CONTROL REGISTERS T1C3 LPEN Bit 7 MSEL IEDG T2C3 SL1 Bit 7 T2C2 T2C1 T2C0 T2PNDA T2ENA T2PNDB Bit 7 SL0 Bit 0 T2ENB Bit 0 The T2CNTRL register contains the following bits: T2C3 Timer T2 mode control bit T2C2 Timer T2 mode control bit T2C1 Timer T2 mode control bit T2C0 Timer T2 Start/Stop control in timer modes 1 and 2, Timer T2 Underflow Interrupt Pending Flag in timer mode 3 T2PNDA Timer T2 Interrupt Pending Flag (Autoreload RA in mode 1, T2 Underflow in mode 2, T2A capture edge in mode 3) T2ENA Timer T2 Interrupt Enable for Timer Underflow or T2A Input capture edge The Timer1 (T1) and MICROWIRE/PLUS control register contains the following bits: T1C3 Timer T1 mode control bit T1C2 Timer T1 mode control bit T1C1 Timer T1 mode control bit T1C0 Timer T1 Start/Stop control in timer modes 1 and 2. T1 Underflow Interrupt Pending Flag in timer mode 3 MSEL Selects G5 and G4 as MICROWIRE/PLUS signals SK and SO respectively IEDG External interrupt edge polarity select (0 = Rising edge, 1 = Falling edge) T2PNDB Timer T2 Interrupt Pending Flag for T2B capture edge T2ENB Timer T2 Interrupt Enable for T2B Input capture edge SL1 & SL0 Select the MICROWIRE/PLUS clock divide by (00 = 2, 01 = 4, 1x = 8) 10.9.2 PSW Register (Address X'00EF) HC C Bit 7 T1PNDA T1ENA EXPND BUSY EXEN 10.9.5 HSTCR Register (Address X'00AF) GIE Reserved Bit 0 Bit 7 The PSW register contains the following select bits: HC Half Carry Flag C Carry Flag T1PNDA Timer T1 Interrupt Pending Flag (Autoreload RA in mode 1, T1 Underflow in Mode 2, T1A capture edge in mode 3) T1ENA Timer T1 Interrupt Enable for Timer Underflow or T1A Input capture edge EXPND External interrupt pending BUSY MICROWIRE/PLUS busy shifting flag EXEN Enable external interrupt GIE Global interrupt enable (enables interrupts) The HSTCR register contains the following bits: T2HS Places Timer T2 in High Speed Mode. The Half-Carry flag is also affected by all the instructions that affect the Carry flag. The SC (Set Carry) and R/C (Reset Carry) instructions will respectively set or clear both the carry flags. In addition to the SC and R/C instructions, ADC, SUBC, RRC and RLC instructions affect the Carry and Half Carry flags. www.national.com 24 T2HS Bit 0 executing from the flash memory or the Boot ROM. The user must program the FLEX bit as appropriate for the application. In the erased state, the FLEX bit = 0 and the device will power-up executing from Boot ROM. When FLEX = 0, this assumes that either the MICROWIRE/PLUS ISP routine or external programming is being used to program the device. If using the MICROWIRE/PLUS ISP routine, the software in the boot ROM will monitor the MICROWIRE/PLUS for commands to program the flash memory. When programming the flash program memory is complete, the FLEX bit will have to be programmed to a 1 and the device will have to be reset, either by pulling external Reset to ground or by a MICROWIRE/PLUS ISP EXIT command, before execution from flash program memory will occur. If FLEX = 1, upon exiting Reset, the device will begin executing from location 0000 in the flash program memory. The assumption, here, is that either the application is not using ISP, is using MICROWIRE/PLUS ISP by jumping to it within the application code, or is using a customized ISP routine. If a customized ISP routine is being used, then it must be programmed into the flash memory by means of the MICROWIRE/PLUS ISP or external programming as described in the preceding paragraph. (Continued) 10.9.6 ITMR Register (Address X'00CF) LSON HSON DCEN CCKS EL RSVD ITSEL2 ITSEL1 Bit 7 ITSEL0 Bit 0 The ITMR register contains the following bits: LSON Turns the low speed oscillator on or off. HSON DCEN Turns the high speed oscillator on or off. Selects the high speed oscillator or the low speed oscillator as the Idle Timer Clock. CCKSEL Selects the high speed oscillator or the low speed oscillator as the primary CPU clock. RSVD ITSEL2 This bit is reserved and must be 0. Idle Timer period select bit. ITSEL1 Idle Timer period select bit. ITSEL0 Idle Timer period select bit. 11.0 In-System Programming 11.3 REGISTERS There are six registers required to support ISP: Address Register Hi byte (ISPADHI), Address Register Low byte (ISPADLO), Read Data Register (ISPRD), Write Data Register (ISPWR), Write Timing Register (PGMTIM), and the Control Register (ISPCNTRL). The ISPCNTRL Register is not available to the user. 11.1 INTRODUCTION This device provides the capability to program the program memory while installed in an application board. This feature is called In System Programming (ISP). It provides a means of ISP by using the MICROWIRE/PLUS, or the user can provide his own, customized ISP routine. The factory installed ISP uses the MICROWIRE/PLUS port. The user can provide his own ISP routine that uses any of the capabilities of the device, such as USART, parallel port, etc. 11.3.1 ISP Address Registers The address registers (ISPADHI & ISPADLO) are used to specify the address of the byte of data being written or read. For page erase operations, the address of the beginning of the page should be loaded. For mass erase operations, 0000 must be placed into the address registers. When reading the Option register, FFFF (hex) should be placed into the address registers. Registers ISPADHI and ISPADLO are cleared to 00 on Reset. These registers can be loaded from either flash program memory or Boot ROM and must be maintained for the entire duration of the operation. Note: The actual memory address of the Option Register is 0x3FFF (hex), however the MICROWIRE/PLUS ISP routines require the address FFFF (hex) to be used to read the Option Register when the Flash Memory is secured. 11.2 FUNCTIONAL DESCRIPTION The organization of the ISP feature consists of the user flash program memory, the factory boot ROM, and some registers dedicated to performing the ISP function. See Figure 13 for a simplified block diagram. The factory installed ISP that uses MICROWIRE/PLUS is located in the Boot ROM. The size of the Boot ROM is 1k bytes and also contains code to facilitate in system emulation capability. If a user chooses to write his own ISP routine, it must be located in the flash program memory. TABLE 4. High Byte of ISP Address ISPADHi Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Addr 15 Addr 14 Addr 13 Addr 12 Addr 11 Addr 10 Addr 9 Addr 8 TABLE 5. Low Byte of ISP Address ISPADLO Bit 7 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Addr 7 20032717 Bit 6 Addr 6 Addr 5 Addr 4 Addr 3 Addr 2 Addr 1 Addr 0 11.3.2 ISP Read Data Register The Read Data Register (ISPRD) contains the value read back from a read operation. This register can be accessed from either flash program memory or Boot ROM. This register is undefined on Reset. FIGURE 13. Block Diagram of ISP As described in Section 10.5 OPTION REGISTER, there is a bit, FLEX, that controls whether the device exits RESET 25 www.national.com COP8SBE9/SCE9 10.0 Functional Description COP8SBE9/SCE9 11.0 In-System Programming 11.3.4 ISP Write Timing Register The Write Timing Register (PGMTIM) is used to control the width of the timing pulses for write and erase operations. The value to be written into this register is dependent on the frequency of CKI and is shown in Table 8. This register must be written before any write or erase operation can take place. It only needs to be loaded once, for each value of CKI frequency. This register can be loaded from either flash program memory or Boot ROM and must be maintained for the entire duration of the operation. The MICROWIRE/PLUS ISP routine that is resident in the boot ROM requires that this Register be defined prior to any access to the Flash memory. Refer to Section 11.7 MICROWIRE/PLUS ISP for more information on available ISP commands. On Reset, the PGMTIM register is loaded with the value that corresponds to 10 MHz frequency for CKI. (Continued) TABLE 6. ISP Read Data Register ISPRD Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 11.3.3 ISP Write Data Register The Write Data Register (ISPWR) contains the data to be written into the specified address. This register is undetermined on Reset. This register can be accessed from either flash program memory or Boot ROM. The Write Data register must be maintained for the entire duration of the operation. TABLE 7. ISP Write Data Register ISPWR Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 TABLE 8. PGMTIM Register Format PGMTIM Register Bit CKI Frequency Range 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 1 25 kHz­33.3 kHz 0 0 0 0 0 0 1 0 37.5 kHz­50 kHz 0 0 0 0 0 0 1 1 50 kHz­66.67 kHz 0 0 0 0 0 1 0 0 62.5 kHz­83.3 kHz 0 0 0 0 0 1 0 1 75 kHz­100 kHz 0 0 0 0 0 1 1 1 100 kHz­133 kHz 0 0 0 0 1 0 0 0 112.5 kHz­150 kHz 0 0 0 0 1 0 1 1 150 kHz­200 kHz 0 0 0 0 1 1 1 1 200 kHz­266.67 kHz 0 0 0 1 0 0 0 1 225 kHz­300 kHz 0 0 0 1 0 1 1 1 300 kHz­400 kHz 0 0 0 1 1 1 0 1 375 kHz­500 kHz 0 0 1 0 0 1 1 1 500 kHz­666.67 kHz 0 0 1 0 1 1 1 1 600 kHz­800 kHz 0 0 1 1 1 1 1 1 800 kHz­1.067 MHz 0 1 0 0 0 1 1 1 1 MHz­1.33 MHz 0 1 0 0 1 0 0 0 1.125 MHz­1.5 MHz 0 1 0 0 1 0 1 1 1.5 MHz­2 MHz 0 1 0 0 1 1 1 1 2 MHz­2.67 MHz 0 1 0 1 0 1 0 0 2.625 MHz­3.5 MHz 0 1 0 1 1 0 1 1 3.5 MHz­4.67 MHz 0 1 1 0 0 0 1 1 4.5 MHz­6 MHz 0 1 1 0 1 1 1 1 6 MHz­8 MHz 7.5 MHz­10 MHz 0 1 1 1 1 0 1 1 R R/W R/W R/W R/W R/W R/W R/W www.national.com 26 memory and reprogram it. If the device is subsequently reset before the Flex bit has been erased by specific Page Erase or Mass Erase ISP commands, execution will start from location 0000 in the Flash program memory. The high voltage (2 x VCC) on G6 will not erase either the Flex or the Security bit in the Option Register. The Security bit, if set, can only be erased by a Mass Erase of the entire contents of the Flash Memory unless under the control of User ISP routines in the Application Program. While the G6 pin is at high voltage, the Load Clock will be output onto G5, which will look like an SK clock to the MICROWIRE/PLUS routine executing in slave mode. However, when G6 is at high voltage, the G6 input will also look like a logic 1. The MICROWIRE/PLUS routine in Boot ROM monitors the G6 input, waits for it to go low, debounces it, and then enables the ISP routine. CAUTION: The Load clock on G5 could be in conflict with the user's external SK. It is up to the user to resolve this conflict, as this condition is considered a minor issue that's only encountered during software development. The user should also be cautious of the high voltage applied to the G6 pin. This high voltage could damage other circuitry connected to the G6 pin (e.g. the parallel port of a PC). The user may wish to disconnect other circuitry while G6 is connected to the high voltage. VCC must be valid and stable before high voltage is applied to G6. The correct sequence to be used to force execution from Boot ROM is : 1. Disconnect G6 from the source of data for MICROWIRE/ PLUS ISP. 2. Apply VCC to the device. 3. Pull RESET Low. 4. After VCC is valid and stable, connect a voltage between 2 x VCC and VCC+7V to the G6 pin. Ensure that the rise time of the high voltage on G6 is slower than the minimum in the Electrical Specifications. Figure 14 shows a possible circuit dliagram for implementing the 2 x VCC. Be aware of the typical input current on the G6 pin when the high voltage is applied. The resistor used in the RC network, and the high voltage used, should be chosen to keep the high voltage at the G6 pin between 2 x VCC and VCC+7V. 5. Pull RESET High. 6. After a delay of at least three instruction cycles, remove the high voltage from G6. (Continued) 11.4 MANEUVERING BACK AND FORTH BETWEEN FLASH MEMORY AND BOOT ROM When using ISP, at some point, it will be necessary to maneuver between the flash program memory and the Boot ROM, even when using customized ISP routines. This is because it's not possible to execute from the flash program memory while it's being programmed. Two instructions are available to perform the jumping back and forth: Jump to Boot (JSRB) and Return to Flash (RETF). The JSRB instruction is used to jump from flash memory to Boot ROM, and the RETF is used to return from the Boot ROM back to the flash program memory. See Section 19.0 Instruction Set for specific details on the operation of these instructions. The JSRB instruction must be used in conjunction with the Key register. This is to prevent jumping to the Boot ROM in the event of run-away software. For the JSRB instruction to actually jump to the Boot ROM, the Key bit must be set. This is done by writing the value shown in Table 9 to the Key register. The Key is a 6 bit key and if the key matches, the KEY bit will be set for 8 instruction cycles. The JSRB instruction must be executed while the KEY bit is set. If the KEY does not match, then the KEY bit will not be set and the JSRB will jump to the specified location in the flash memory. In emulation mode, if a breakpoint is encountered while the KEY is set, the counter that counts the instruction cycles will be frozen until the breakpoint condition is cleared. If an interrupt occurs while the key is set, the key will expire before interrupt service is complete. It is recommended that the software globally disable interrupts before setting the key and re-enable interrupts on completion of Boot ROM execution. The Key register is a memory mapped register. Its format when writing is shown in Table 9. TABLE 9. KEY Register Write Format KEY When Writing Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 1 0 0 1 1 0 X X Bits 7­2: Key value that must be written to set the KEY bit. Bits 1­0: Don't care. 11.5 FORCED EXECUTION FROM BOOT ROM When the user is developing a customized ISP routine, code lockups due to software errors may be encountered. The normal, and preferred, method to recover from these conditions is to reprogram the device with the corrected code by either an external parallel programmer or the emulation tools. As a last resort, when this equipment is not available, there is a hardware method to get out of these lockups and force execution from the Boot ROM MICROWIRE/PLUS routine. The customer will then be able to erase the Flash Memory code and start over. The method to force this condition is to drive the G6 pin to high voltage (2 x VCC) and activate Reset. The high voltage condition on G6 must not be applied before VCC is valid and stable, and must be held for at least 3 instruction cycles longer than Reset is active. This special condition will bypass checking the state of the Flex bit in the Option Register and will start execution from location 0000 in the Boot ROM. In this state, the user can input the appropriate commands, using MICROWIRE/PLUS, to erase the flash program 20032766 FIGURE 14. Circuit Diagram for Implementing the 2 x VCC 27 www.national.com COP8SBE9/SCE9 11.0 In-System Programming COP8SBE9/SCE9 11.0 In-System Programming Manual, available from the same web site. This document includes details of command format and delays necessary between command bytes. The MICROWIRE/PLUS ISP supports the following features and commands: · Write a value to the ISP Write Timing Register. NOTE: This must be the first command after entering MICROWIRE/PLUS ISP mode. · Erase the entire flash program memory (mass erase). · Erase a page at a specified address. · Read Option register. · Read a byte from a specified address. (Continued) 11.6 RETURN TO FLASH MEMORY WITHOUT HARDWARE RESET After programming the entire program memory, including options, it is necessary to exit the Boot ROM and return to the flash program memory for program execution. Upon receipt and completion of the EXIT command through the MICROWIRE/PLUS ISP, the ISP code will reset the part and begin execution from the flash program memory as described in the Reset section. This assumes that the FLEX bit in the Option register was programmed to 1. · Write a byte to a specified address. · Read multiple bytes starting at a specified address. · Write multiple bytes starting at a specified address. · Exit ISP and return execution to flash program memory. The following table lists the MICROWIRE/PLUS ISP commands and provides information on required parameters and return values. 11.7 MICROWIRE/PLUS ISP National Semiconductor provides a program, which is available from our web site at www.national.com/cop8, that is capable of programming a device from the parallel port of a PC. The software accepts manually input commands and is capable of downloading standard Intel HEX Format files. Users who wish to write their own MICROWIRE/PLUS ISP host software should refer to the COP8 FLASH ISP User TABLE 10. MICROWIRE/PLUS ISP Commands Command Function Command Value (Hex) Parameters Return Data PGMTIM_SET Write Pulse Timing Register 0x3B Value N/A PAGE_ERASE Page Erase 0xB3 Starting Address of Page N/A MASS_ERASE Mass Erase 0xBF Confirmation Code N/A (The entire Flash Memory will be erase