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CHAPTER
INTRODUCTION
This manual provides general information, hardware preparation, installation instructions, monitor program description, operating instructions, hardware description, support information M68HC11 Evaluation Board (EVB). Downloading S-record information contained Appendix While listing monitor program stored diskettes supplied with (see file buf25.asm). (This file viewed using text reader capable handling 123K file.) NOTE Unless otherwise specified, address references hexadecimal throughout this manual. asterisk following signal name denotes that signal true valid when signal low.
FEATURES
features include: economical means debugging user assembled code evaluating target systems incorporating MC68HC11 microcomputer unit (MCU) device One-line assembler/disassembler Host computer downloading capability MC68HC11 based debugging/evaluating circuitry MC68HC24 Port Replacement Unit (PRU) based expansion circuitry MC6850 Asynchronous Communications Interface Adapter (ACIA) based terminal port circuitry RS-232C compatible terminal/host computer ports
M68HC11EVB/D
SPECIFICATIONS
Table lists specifications. Table 1-1. Specifications
Characteristics ACIA ports: Terminal Host computer extension Temperature: Operating Storage Relative humidity Power requirements Specifications MC68HC11A1FN MC68HC24FN MC68B50 RS-232C compatible RS-232C compatible HCMOS-TTL compatible degrees degrees (non-condensing) (max) (max) (max) 7.062 (17.8 4.625 (11.75
Dimensions: Width Length
M68HC11EVB/D
GENERAL DESCRIPTION
MC68HC11 device advanced single-chip with on-chip memory peripheral functions. Refer MC68HC11 data sheet additional device information. demonstrate capabilities this MCU, functions with debug monitor program called BUFFALO (Bit User Fast Friendly Logical Operations). This monitor program contained within on-board EPROM (external MCU). provides cost tool debugging evaluation MC68HC11 MCU-based target system equipment (Figure block diagram EVB). intended replacement much more powerful flexible tool, such Motorola M68HC11EVM Evaluation Module. operates either debugging evaluation (emulation) mode operation. first mode operation lets debug your code using BUFFALO monitor program. User code assembled host computer then downloaded Motorola S-records. second mode operation lets evaluate (emulate) user code target system environment utilizing memory MC68HC11 MCU. emulates single-chip mode operation, even though operates expanded multiplexed mode operation times. Overall evaluation/debugging control provided BUFFALO monitor program terminal interaction. target system interface provided devices. RS-232C terminal/host port interface circuitry provides communication data transfer operations between external terminal/host computer devices. Independent baud rate selection capabilities provided terminal host ports. Hardware selectable (300-9600) baud rates provided ACIA-based terminal port. non-selectable (fixed) 9600 baud rate provided host port Serial Communications Interface (SCI). requires user-supplied +12, power supply RS-232C compatible terminal operation. RS-232C compatible host computer used with download Motorola S-records BUFFALO monitor commands. Motorola S-record format devised purpose encoding programs data files printable format transportation between computer systems. transportation process therefore monitored S-records easily edited. Refer Appendix additional S-record information.
M68HC11EVB/D
Figure 1-1. Block Diagram
EQUIPMENT REQUIRED
Table lists external equipment requirements operation. Table 1-2. External Equipment Requirements
External Equipment +12, power supply(1) Terminal (RS-232C compatible) Host computer (RS-232C compatible)(2) Terminal/host computer RS-232C cable assembly(1) Target system port extension cable assembly(1) Refer Chapter details. Optional required basic operation
M68HC11EVB/D
HARDWARE DESCRIPTION
CHAPTER HARDWARE DESCRIPTION
INTRODUCTION
This chapter provides overall general description hardware. This description supported simplified block diagram (Figure 5-1) memory diagram (Figure 5-2). schematic diagram, located Chapter also referred following descriptions.
GENERAL DESCRIPTION
Overall evaluation/debugging control provided monitor BUFFALO program residing EPROM (external MCU) terminal intervention. target system interface provided devices. RS-232C terminal/host port interface circuitry provides communication data transfer operations between external terminal/host computer devices. 5.2.1 Microcomputer
M68HC11A1 (U10) operates expanded mode operation. This accomplished applied MODA MODB pins. configuration (CONFIG) register (implemented EEPROM) programmed such that ROMON cleared operations. When this cleared, internal disabled that memory space becomes externally accessed space. This allows memory $E000-$FFFF contain monitor BUFFALO program user program emulation) external EPROM. monitor program uses internal located $0048-$00FF. control registers located $1000-$103F. allows user features monitor BUFFALO program, however should noted that monitor program uses on-chip locations $0048-$00FF leaving only bytes user (i.e., $0000-$0047). This should remembered when writing code.
M68HC11EVB/D
HARDWARE DESCRIPTION
5.2.2
Port Replacement Unit
operates expanded multiplexed mode operation. MC68HC24 device (U1) used replace ports (including STRA STRB control lines) used single chip mode operation. provides required single chip mode lines target system evaluation (emulation) extension port connector
Figure 5-1. Block Diagram
M68HC11EVB/D
HARDWARE DESCRIPTION
INTERNAL (MCU RESERVED) USED PRU+REG.DECODE USED FLIP-FLOP DECODE OPTIONAL USED TERMINAL ACIA USED EEPROM USED USER MONITOR EPROM
$0000 $00FF $0100 $0FFF $1000 $17FF $1800 $3FFF $4000 $5FFF $6000 $7FFF $8000 $97FF $9800 $9FFF $A000 $B5FF $B600 $B7FF $B800 $BFFF $C000 $DFFF $E000 $FFFF
$0000-$0032 $0033-$0047 $0048-$00C3 $00C4-$00FF
USER USER STACK POINTER MONITOR VARIABLES VECTOR JUMP TABLE
Figure 5-2. Memory Diagram
M68HC11EVB/D
HARDWARE DESCRIPTION
5.2.3
Memory
memory single design. User resides different address locations that ROM. code debugged which re-locatable will require modification before being transferred EPROM executed instead monitor (evaluation mode). evaluate programs normally held ROM, byte provided (socket U5). access time nanoseconds necessary frequency MHz. Jumper headers configure socket additional byte supplied user required. Refer paragraph 2.3.3 additional memory select information. 5.2.4 Address Decoding/De-multiplexing
Address decoding accomplished MC74HC138 device (U6) segmented into byte blocks. order address data lines de-multiplexed using MC74HC373 device (U2), communicate with ROM, RAM, ACIA. uses multiplexed input direct from MCU. 5.2.5 RS-232C Port Interface Circuits
uses MC68B50 ACIA device (U9) communicate terminal RS-232C driver/receiver interface (terminal port). terminal port baud rate hardware selectable (300-9600 baud) jumper header second RS-232C driver/receiver interface (host port) fixed 9600 baud using clock external bus. This baud rate changed software reprogramming BAUD register ONSCI subroutine BUFFALO monitor program. Refer buf25.asm file diskette additional information pertaining ONSCI subroutine. host port provided downloading Motorola S-records BUFFALO monitor commands. When using host port, either executing HOST LOAD commands, target system Serial Communications Interface (SCI) switched host port MC74HC4066 digital switch device (U7) MC74HC74 latch device (U11). receiver connection from host port connected port MCU. switching receiver line from target system host port accomplished writing logic address range $4000-$5FFF. Likewise, writing zero address same range results target system being connected MCU. RS-232C handshake lines used, delay approximately milliseconds present between successive characters sent host computer during execution LOAD command monitor program.
M68HC11EVB/D
SUPPORT INFORMATION
CHAPTER SUPPORT INFORMATION
INTRODUCTION
This chapter provides connector signal descriptions, parts list with associated parts location diagram, schematic diagrams EVB.
CONNECTOR SIGNAL DESCRIPTIONS
provides input/output (I/O) connector that used interconnect target system. Connector facilitates this interconnection. Connectors also provided facilitate interconnection terminal host computer, respectively. Connector interconnects external power supply EVB. assignments above connectors through identified Tables through respectively. Connector signals identified number, signal mnemonic, signal name description.
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-1. Port Connector (P1) Assignments
Signal Mnemonic MODB Ground MODE input control line used mode selection. high level enables expanded multiplexed mode, level enables special test mode MCU. MODE input control line used mode selection during reset. open-drain output line used LIR* status indication. STROBE input control line used parallel port operations. ENABLE CLOCK output control line used timing reference. clock frequency fourth frequency XTAL EXTAL pins. STROBE output control line used parallel port operations. EXTAL External clock input line. XTAL Internal clock line used control clock generator circuitry. PORT (bits 0-7) General purpose lines. RESET active bi-directional control line used initialize MCU. INTERRUPT REQUEST active input line used request asynchronous non-maskable interrupts MCU.
Number
Signal Name Description
MODA
STRA
9-16
STRB EXTAL XTAL PC0-PC7 RESET* XIRQ*
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-1. Port Connector (P1) Assignments (continued)
Signal Mnemonic IRQ* PA7-PA0 PB7-PB0
Number 27-34 35-42
Signal Name Description INTERRUPT REQUEST active input line used request asynchronous interrupts MCU. PORT (bits 0-5) General purpose lines. These lines used with Serial Communications Interface(SCI) Serial Peripheral Interface(SPI).
+5.0 power. PORT (bits 7-0) General purpose lines. PORT (bits 7-0) General purpose output lines. PORT (bits 0-7) General purpose input channel input lines.
VOLTAGE REFERENCE Input reference supply voltage (low) line analog-to-digital (A/D) converter. Used increase accuracy conversion. VOLTAGE REFERENCE HIGH Input reference supply voltage (high) line. Same purpose connected.
53-60
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-2. Terminal Port Connector (P2) Assignments
Signal Mnemonic
Number
Signal Name Description PROTECTIVE GROUND RECEIVED DATA Serial data input line. TRANSMITTED DATA Serial data output line. connected. CLEAR SEND output signal used indicate readyto-transfer data status. This connected both DATA READY output signal used indicate online/in-service/active status. This connected both SIGNAL GROUND This line provides signal ground common return connection (common ground reference) between RS-232C compatible terminal. DATA CARRIER DETECT output signal used indicate acceptable received line (carrier) signal been detected. This connected both connected. DATA TERMINAL READY input line used indicate on-line/in-service/active status. connected.
SIG-GND
9-19 21-25
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-3. Host Port Connector (P3) Assignments
Signal Mnemonic
Number
Signal Name Description PROTECTIVE GROUND RECEIVED DATA Serial data output line. TRANSMITTED DATA Serial data input line. connected. DATA READY output signal used indicate online/in-service/active status. This connected SIGNAL GROUND This line provides signal ground common return connection (common ground reference) between RS-232C compatible host computer. DATA CARRIER DETECT output signal used indicate acceptable received line (carrier) signal been detected. This connected connected. DATA TERMINAL READY input line used indicate on-line/in-service/active status. connected.
SIG-GND
9-19 21-25
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-4. Input Power Connector (P4) Assignments
Signal Mnemonic
Number
Signal Name Description Power Input voltage (-12 used logic circuits. GROUND Power Input voltage used logic circuits. Power Input voltage (+12 used logic circuits.
M68HC11EVB/D
SUPPORT INFORMATION
PARTS LIST
Table lists components reference designation order. reference designation used identify particular part parts location diagram (Figure 6-1) that associated with parts list table. This parts list reflects latest issue hardware time printing.
Figure 6-1. Parts Location Diagram
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-5. Parts List
Reference Designation Printed Wiring Board (PWB) C1-C5, C8-C11, C13, C14, C17, R1-R3, R5-R10 R11, R13-R15 M68HC11EVB Capacitor, Vdc, +/-20% Capacitor, Vdc, +/-20% Capacitor, Vdc, +/-20% Capacitor, electrolytic, Vdc, +/-20% Header, jumper, single post, pin, Aptronics 92970501-02 Header, jumper, single post, pin, Aptronics 92970501-03 Header, jumper, double post, pin, Aptronics 92971501-06 Header, double post, pin, Aptronics 929715-01-30 (MCU port connector) Connector, cable, 25-pin, DBP-25SAA (terminal/host port connector) Terminal block, position, Electrovert 25.112.0453 (power supply connector) Resistor, ohm, 1/4W Resistor, ohm, 1/4W Resistor, ohm, 1/4W Resistor, ohm, 1/4W Component Description
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-5. Parts List (continued)
Reference Designation R17, Component Description Resistor, 100k ohm, 1/4W Resistor, 2.2k ohm, 1/4W Switch, push-button, SPDT, #8125-R2/7527 I.C., MC68HC24FN, I.C., MC74HC373N, transparent latch I.C., 2764, EPROM, I.C., MCM6164, (user supplied) I.C., MCM6164, RAM, I.C., MC74HC138, decoder/de-multiplexer I.C., MC74HC4066/MC14066B, digital switch I.C., MC1488P, RS-232C driver I.C., MC68B50P, ACIA I.C., MC68HC11A1FN, (Note I.C., MC74HC74, D-type flip-flop I.C., MC74HC14, inverter I.C., MC74HC4040, binary ripple counter I.C., MC1489P, RS-232C receiver Voltage detector, 3.80-4.20 Vdc, Motorola #MC34064P Seiko S-8054HN Socket, mount, pin, PLCC, 821-551-1 (use with
M68HC11EVB/D
SUPPORT INFORMATION
Table 6-5. Parts List (continued)
Reference Designation XU3-XU5 XU10 Fabricated jumper Component Description Socket, pin, DIP, Robinson Nugent ICL-286-S7-TG (use with U3-U5) Socket, pin, DIP, Robinson Nugent ICL-246-S7-TG (use with Socket, mount, pin, PLCC, 821-575-1 (use with U10) Crystal, MCU, (Notes Crystal, ACIA, 2.4576 Aptronics 929955-00 (use with jumper headers J1-J6)
NOTES supplied with have configuration (CONFIG) register ROMON cleared disable internal ROM, thereby allowing external EPROM containing BUFFALO program control operations. Crystal frequencies from MHz) used without changes capacitors resistor (R5) values. crystal obtains E-clock/9600 baud operation. crystal obtains E-clock/4800 baud operation.
6-10
M68HC11EVB/D
SUPPORT INFORMATION
DIAGRAMS
Figure schematic diagram.
Figure 6-2. Schematic Diagram (Sheet
M68HC11EVB/D
6-11
SUPPORT INFORMATION
Figure 6-2. Schematic Diagram (Sheet
6-12
M68HC11EVB/D

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