Hi,

Vince Deno wrote:
> > Can anyone suggest a way to take advantage of the power-saving
> > capabilities (killing the OSC) without having to worry about generating a
> > false WDT reset?  Any suggestions regarding this, or any other
> > power-saving functionality would be greatly appreciated.

You could use an external watchdog or RTC chip to wake you up on a
pin change.  Generally speaking lower voltage, lower clock rate and
lower duty cycle will give better power.  If you told me more about
your application I could possibly make some suggestions.

You should remember the watchdog timer eats some power too (around
9uA typ. if I have the right datasheet open).
Another issue with PIC's is the internal pull-ups, make sure no
current is flowing through them.  Don't leave any tri-state inputs
open.  Power switching is another way to save power, if you have
devices in your design that are not used all the time you could
switch them off with a MOSFET (make sure no current will flow through
them when they are off, e.g. through the protection diodes).
The latest edition of Art of Electronics has a chapter on low power
design, well worth reading.

> > Regards,
> >
> > Vince Deno

Hope this helps,
Guy - mlsirton@inter.net.il