----------
>Has anybody heard of, or experienced PIC16C74's not meeting temperature
>specs? I have a couple of em' that seem to get lost at around 10 C. These are
>not industrial parts, but should get down to at least 0 C.
>
>Rodger Mayeda
>Pacific Gas and Electric Co. R&D
>

The book does hint that the WDT slows down as temp increases.
Therefore the WDT may speed up as temp decreases.  So as someone
else said, "the watch dog may be timming out".

I had a problem with a PIC16C74 going out to lunch.  I read the
book at 4.3.2 "WDT programming considerations".  It sugesses that
the OPTION register be updated at regular intervals.  I added
the OPTION register update and the problem went away.

Another small mention in the book that may have a large effect,
is adding componets for a power up circuit to (not)MCLR.
Figure 4.5 "External power on reset circuit".

   ---------
   Bill Cornutt
   billcorn@infoserv.com
   Located in Ione California USA.
   A small town in Northern California.
   Sitting against the foothills of the Mother Lode.
   ----------------------------------------------------