PIC16C62B DS35008A PIC16CXXX 1024TOSC QS-9000 11F-3 DK-2750 D-81739 - Datasheet Archive
PIC16C62B Rev. A Silicon Errata Sheet The PIC16C62B (Rev. A) parts you have received conform functionally to the Device Data
PIC16C62B PIC16C62B PIC16C62B PIC16C62B Rev. A Silicon Errata Sheet The PIC16C62B PIC16C62B (Rev. A) parts you have received conform functionally to the Device Data Sheet (DS35008A DS35008A), except for the anomalies described below. FIGURE 1: MCLR EXTERNAL CIRCUIT VDD All the problems listed here will be addressed in future revisions of the PIC16C62B PIC16C62B silicon. 1. Module: RESET The minimum specification for the MCLR must be met in order to RESET the PIC16CXXX PIC16CXXX. If a MCLR pulse occurs that is less that the minimum specification (parameter #30), improper device operation can occur. If the minimum specification cannot be met, then an external circuit must be used to insure that any pulse width less than the specification will be filtered before it reaches the MCLR pin. R1 R2 MCLR C1 PIC16CXXX PIC16CXXX 4.7K R1 10K 0.01µF C1 0.1µF R2 = 100 Work Around A possible circuit is shown in Figure 1. Proper design validation needs to be done to ensure desired operation over the applications operating conditions Note: As with any windowed EPROM device, please cover the window at all times, except when erasing. © 1999 Microchip Technology Inc. DS80016B-page 1 PIC16C62B PIC16C62B 2. Module: OSCILLATOR The Oscillator Start-up Timer (TOST) delay may not occur when the device wakes-up from sleep. Figure 1 shows the start-up of the crystal after the event that causes the device to wake up from sleep mode (as specified in device data sheet). The startup time (TOST) may not occur. The events that wake-up the device from sleep are: · · · · An interrupt A WDT overflow (wake-up) A Brown-out Reset A MCLR reset Figure 1: Wake-up from Sleep Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 OSC1 CLKOUT(4) TOST(2) Wake-up Event Occurs INSTRUCTION FLOW PC PC Instruction fetched Inst(PC) = SLEEP Instruction executed Inst(PC - 1) PC+1 - TCY TCY TCY TCY Inst(PC + 1) SLEEP Note 1: For TOST delay to be enabled, the XT, HS or LP oscillator mode must be selected. 2: TOST = 1024TOSC 1024TOSC, This delay may not occur, and every valid clock edge will generate internal device clocks. 3: CLKOUT is not available in these osc modes, but shown here for timing reference. In applications where time based measurements are started immediately after wake-up from sleep, the suggested work around should be implemented. Work Around After the SLEEP instruction, do a software delay of 256 TCY (same as 1024 TOSC). At the Reset and Interrupt vector addresses, test to see if the device woke from sleep (the TO and PD bits), and if the device did wake from sleep, ensure that the total cycle delay is 256 TCY. DS80016B-page 2 © 1999 Microchip Technology Inc. PIC16C62B PIC16C62B Module: TMR1 Clarifications/Corrections to the Data Sheet: When operating in external clock mode (TMR1CS is set), reading either of the timer 1 registers (TMR1H or TMR1L) may cause the timer not to increment as expected. This occurs for both synchronous and asynchronous inputs. 3. In the Device Data Sheet (DS35008A DS35008A), the following clarifications and corrections should be noted. none. The scenarios which display this are: · When a read operation of the TMR1H register occurs, the TMR1L register may not increment. · When a read operation of the TMR1L register occurs, the TMR1H register may not increment. This improper operation is only an issue when the TMR1L register increments from FFh to 00h (FFh 00H) during the read of the TMR1L register. Work Around Do not read either the TMR1H or the TMR1L registers when operating in external clock mode (TMR1CS is set). If the application needs to read the 16-bit counter, evaluate if this function can be moved to the TMR0 or one of the other timer resources on the device. © 1999 Microchip Technology Inc. DS80016B-page 3 Note the following details of the code protection feature on PICmicro® MCUs. · · · · · · The PICmicro family meets the specifications contained in the Microchip Data Sheet. Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet. The person doing so may be engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable". Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our product. If you have any further questions about this matter, please contact the local sales office nearest to you. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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