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Errata 80129F
PIC18F8720/8620/6720/6620 Rev. A3:
Module: Core
Certain code sequence and placement may cause
the corruption of a few bits in the instruction fetch
when the part is used above 4 MHz. A corrupted
instruction fetch will cause the part to execute an
improper instruction and result in unpredictable
outputs.
Microchip cannot predict which code sequences
and placement will cause this failure.
If this failure
mechanism exists in your system, it should be
evident during statistically significant pre-production
testing (minimum suggested sample
size 100 units) of your particular code sequence
and placement.
Work around.
Use the part at or below 4 MHz.
E-mail: 
info@telesys.ru
