Jan -

   In our application of the 12c508, I believe the chip does
reset when sleeping, and an inut comes in on GP0/1/3.
Right after the start statement in our code, we check the
status register, to see what got us to the beginning. IF
it was a wakeup from sleep, then we skip our initialization
code, otherwise we figure this is powerup and we initialize
our variables, etc.

   Does this help answer your question?

Best regards.
- Gary gmdsr@vivanet.com
  Embedded Research
  http://www.vivanet.com/~gmdsr