Flash code corruption on pic6f870

cbarn24050_at_aol.com
Date: 02/27/05 

Date: 27 Feb 2005 10:46:38 -0800

I have about 20 units in the field using the PIC16f870. Some have been
in use for nearly 2 years without any problems but recently 2 units
have come back as faulty. They have the same symptons, the program
crashes during its interrupt routine, it doesn't return, it doeas
execute the first few instructions though I can tell how far it gets
before it crashes. After 15mS the watchdog resets and the cycle
repeats. There appears to be no hardware faults anywhere. Ive read the
data eeprom values and they are as expected, I can't read the code as
its protected. Low voltage programming is disabled and code protection
bits are set. The program does not have any routines for writing to
code memory. If I reprogram the chip with the same software it now
works faultlessly. Anyone got any ideas?

Relevant Pages

  • Re: Flash code corruption on pic6f870
    ... > crashes during its interrupt routine, it doesn't return, it doeas ... Low voltage programming is disabled and code protection ... If I reprogram the chip with the same software it now ...
    (comp.arch.embedded)
  • Re: Flash code corruption on pic6f870
    ... was never verified at the extremes of power supply voltage for that device. ... > crashes during its interrupt routine, it doesn't return, it doeas ... Low voltage programming is disabled and code protection ...
    (comp.arch.embedded)