1. Power Supply Variations outside expected limits (transients etc)
2. Interrupts (Intentional or not) and how they are handled..
3. Input pins changing into output pins (& driving a low impedance)
4. Floating pins defined as inputs & susceptable to exernal noise/
RF/static
5. External harware driving pins outside the limits.
6. Clock/Xtal problems.

If you still have problems we might need a bit more info as to the
application / environment etc. to suggest something deeper.

Richard P






After chasing a random crashing problem on a 16F877 project for days now,
I've run dry of troubleshooting strategies (not that I had very many
sensible ones to begin with).  In short, my project will perform certain
operations flawlessly sometimes, then fails spectacularly on the 'n'th
attempt, with 'n' generally residing between 1 and 10.  My inexperience has
likely led me to commit some programming faux pas I just can't spot.  To
help get me unstuck, would any of you gurus be willing to complete the
phrase;

"When my program blows up randomly, the first thing I look for is..."

Thanks in advance!

Rob Robson

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