Hi Andy

You wrote:
> If you have the registers to spare, you may want to try simply loading a
> few (four of them, perhaps) with known values.  Check the contents of
> those registers on reset.  If they contain the proper values, you can
> assume that the PIC was reset via MCLR.  If they don't, assume that the
> PIC was just powered up.

Yes, useful tip for checking if reset was caused by power-up or
by MCLR reset.
However the subject were Watch Dog Timeout reset vs. MCLR reset.

According to the manual, the TO bit should indicate whether a
Watch dog timeout has occurred. But under some circumstances the
TO bit does NOT have the correct value. That is the problem.


   Michael