PIC16C641 PIC16C641 Rev. A Silicon Errata Sheet The PIC16C641 (Rev. A) parts you have received conform functionally to the Device Data Sheet (DS30559A), except for the anomalies described below. All the problems listed here will be addressed in future revisions of the PIC16C641 silicon. 1. Module: Timer0 The TMR0 register may increment when the WDT postscaler is switched to the Timer0 prescaler. If TMR0 = FFh, this will cause TMR0 to overflow (setting T0IF). Work Around Follow the following sequence: a) b) c) d) Read the 8-bit TMR0 register into the W register Clear the TMR0 register Assign WDT postscaler to Timer0 Write W register to TMR0 2. Programming: Code Protect Bits The user could see the following error messages when using PROMATE to program the devices. The messages are for the configuration bits only. Work Around a) b) After a program or verify, there could be an indication that there was a config. bit error. If the error box shows all configuration bits as correct but does not show the code protect bits (CP), then the device was properly programmed but code protect will not operate. When reading in a part, you may get an error that indicates that the code protect bits are invalid and the device is unusable. Again, the device was properly programmed but code protect will not operate. In both cases, the part was programmed correctly but code protect will not operate. Note: As with any windowed EPROM device, please cover the window at all times, except when erasing. 1998 Microchip Technology Inc. DS30559A/C641/E2A1-page 1 PIC16C641 Clarifications/Corrections to the Data Sheet: 3. The specification for the High Voltage Open Drain I/O (The RA4 pin on most devices) cannot be met without possible long term reliability issues on that I/O pin. If a high voltage drive is required, use an external transistor that can support the required voltage. In the Device Data Sheet (DS30559A), the following clarifications and corrections should be noted. TABLE 1: Param No. D150 Module: I/O Ports DC SPECIFICATION CHANGES FROM DATA SHEET Data Sheet Specification New Specification Sym. VOD Characteristic Open-drain High Voltage DS30559A/C641/E2A1-page 2 Units Min Typ Max Min Typ Max Ñ Ñ 10 Ñ Ñ 14 V 1998 Microchip Technology Inc. PIC16C641 1998 Microchip Technology Inc. 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