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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SPDIP 28 8-Bit 4 MHz I/O number 22

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1999 Microchip Technology Inc. DS80053B-page 1

PIC16F87X

The PIC16F87X (Rev. B) parts you have received con-

form functionally to the Device Data Sheet

(DS30292A), except for the anomalies described

below.

All the problems listed here will be addressed in future

revisions of the PIC16F87X silicon.

All devices have been marked revision “B” and “engi-

neering sample” or “ES”.

1. Module: Program Memory

When instruction execution resumes after an inter-

nal program cycle terminates, the following 16

memory locations must be blank (all 1’s). Other-

wise this may cause unexpected device operation.

Work Around

To address this issue, use the following software

sequence. Fixed in silicon revision B3.

EXAMPLE 1: CODE WORK AROUND

bsf STATUS, RP1

bcf STATUS, RP0

bcf INTCON, GIE ; If interrupts enabled

movlw 0x55

movwf EECON2

movlw 0xAA

movwf EECON2

bsf EECON1, WR

nop

;

; When used with MPASM, the data 0x3fff places all ’1’s at that point in the program.

; This executes as an addlw 0xff instruction which is completely benign at this point

; in the program.

;

data 0x3fff ; Instruction with all ones

data 0x3fff ; needed to clear high voltage

data 0x3fff ; out of the program memory

data 0x3fff ; arrays

data 0x3fff

bsf INTCON, GIE ; If interrupts enabled

bcf EECON1, WREN

PIC16F87X Rev. B Silicon Errata Sheet

Summary of content (5 pages)

PAGE 1
PIC16F87X PIC16F87X Rev. B Silicon Errata Sheet The PIC16F87X (Rev. B) parts you have received conform functionally to the Device Data Sheet (DS30292A), except for the anomalies described below. All the problems listed here will be addressed in future revisions of the PIC16F87X silicon. All devices have been marked revision “B” and “engineering sample” or “ES”. EXAMPLE 1: 1.
PAGE 2
PIC16F87X 2. Module: MSSP - SPI mode The scenarios which display this are: The SDI pin is controlled by the module and not by the state of the TRIS bit. This means that the SDI pin cannot be an output when the MSSP module is in SPI mode. a) When a read operation of the TMR1H register occurs, the TMR1L register may not increment. b) When a read operation of the TMR1L register occurs, the TMR1H register may not increment.
PAGE 3
PIC16F87X 6. Module: I/O Ports Clarifications/Corrections to the Data Sheet: The IOL condition for the VOL specification has been relaxed for the I/O ports. Table 2 shows what the current data sheet specification is, as well as the limit that the device is currently tested to. In the Device Data Sheet (DS30292A), the following clarifications and corrections should be noted: None. Work Around None TABLE 2: Param No.
PAGE 4
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.
PAGE 5
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