Tried to post this earlier, but it didn't get through, I don't think:

Has anyone thought of using the WDT?  Just check the flag bits at the
beginning of your program, and you can tell if you're starting from
scratch (better init everything) or just waking up from the WDT.

You can set the WDT prescaler to the interval you want, then do your
loop stuff, and go to sleep.  The WDT will wake you up.  You just have
to structure your program to branch to the loop entry from the
beginning if it's a WDT entry...

That is, if you're not already planning to use the WDT for the obvious...

Someone give me a sanity check on this...  I may use it in an upcoming
project.

Regards,

- JohnR

--
John R. Haggis                         outside mail, please respond to:
IBM Almaden Research Center            haggis@netcom.com
927-2474  /  ZZHAGGIS AT ALMADEN


--------- Forwarded Message Follows ---------

   "My plan is to assign the prescaler to the RTCC and spin waiting for
    it to equal zero."

That works; my usual technique is to set the RTCC to a negative number
and bit-test the MSB.  Remember to account for the delay between
initializing the RTCC and when it begins to increment.

                                Paul Milazzo <milazzo@bbn.com>
                                BBN Systems and Technologies
                                Cambridge, MA