PIC18FXX39
PIC18FXX39 Rev. B5 Silicon Errata Sheet
The PIC18FXX39 Rev. B5 parts you have received
conform functionally to the Device Data Sheet
(DS30485A), except for the anomalies described
below.
All the problems listed here will be addressed in future
revisions of the PIC18FXX39 silicon.
2. Module: Data EEPROM
When reading the data EEPROM, the contents of
the EEDATA register may become corrupted in the
second instruction cycle after the RD bit
(EECON1<0>) is set. The actual contents of the
EEPROM remains unaffected.
Work around
To ensure the integrity of the contents of EEDATA,
the register must be read in the instruction imme-
diately following the setting of the RD bit. Use the
movf
or
movff
instructions to do this (see
Example 1).
Additionally, all interrupts must be disabled prior to
the read instruction sequence. Interruptions of the
sequence may have the same result of altering the
contents of EEDATA.
1. Module: Program Memory
Data corruption may occur during a Table Write
operation if a peripheral interrupt also occurs. This
happens only when the interrupt enable bit (PIE or
INTCON register) for the corresponding interrupt
has also been set.
Work around
Before executing any Table Write instructions, dis-
able ALL peripheral interrupts. This is best done by
clearing all Interrupt Enable bits in the three Inter-
rupt Control registers (INTCON, INTCON2 and
INTCON3) and both Peripheral Interrupt Enable
registers (PIE1 and PIE2). After the Table Write is
complete, restore all INTCON and PIE registers to
their pre-instruction state.
Date Codes that pertain to this issue:
All engineering and production devices.
EXAMPLE 1:
鈥?/div>
鈥?/div>
bcf
bsf
movf
bsf
鈥?/div>
鈥?/div>
SUGGESTED SEQUENCE
FOR READING EEDATA
INTCON,GIEH ;disable interrupts
;if using interrupts
EECON1,RD
;start the read operation
EEDATA,W
;move the data out of
;EEDATA
INTCON,GIEH ;enable interrupts
;if using interrupts
Date Codes that pertain to this issue:
All engineering and production devices.
錚?/div>
2002 Microchip Technology Inc.
DS80148A-page 1
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8-Pin FLASH-Based 8-Bit CMOS Microcontrollers
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EPROM/ROM-Based 8-Bit CMOS Microcontroller Series
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