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80128d.pdf
PIC16F87XA Rev. B0 Silicon/Data Sheet Errata
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 evi-dent
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
