>        What happens if one is running a 16F84 or any of the older
>PIC'S using an external clock source and you give it the sleep
>instruction?  My guess would be that it either does something like a
>power-on reset or it may halt in whatever state it was in before it
>got the instruction.  Anyone remember the mythical HCF or Halt and
>Catch Fire instruction that reportedly lurked in the old 6502's and
>Z80's?

The pic will sleep nevertheless in my experience. I did not check power
requirements in this condition, but it was sleeping ok. The HCF was a
PDP11 (and clones) feature, neither the 65xx nor the X80 had it.

Peter

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