solarwind wrote:
> If I use an
> external clock source, will the clock still be pulsing even after the
> micro is asleep? And that's what I'm worried will waste a lot of
> energy.

So don't do that.  Use the internal RC oscillator with the PLL such that the
PIC runs as fast as possible when doing calculations, then go back to sleep
when there is nothing to do.  One advantage of the R-C oscillator is that it
can start and stop almost instantly.

If the wide calculations where taking 1 second without the PLL, then they
will probably be fast enough as is when running at the highest speed the
processor can from its internal R-C oscillator.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist