Alice Campbell wrote:
>
> Hello Chris,
> i don't think you need 2 crystals, you just need more
> creative ways of wasting time with one crystal.
> for example, figure out the exact number of cycles that it
> takes to process one sample compleyely, then set up a nested
> set of loops that will waste cycles until the total is
> 1/16 second. then do that 15 more times.
>
> you can even sleep the chip in little chunks of time, using
> the option register prescaler, the little chunks would be
> easier to count than a bazillion cycles.
>
> i dont consider running an f877 at 32kHz a waste, i consider
> it a lesson in humility for the mighty pic.

Not to mention the power you'd save by running a slow clock.
The slower your base clock rate, the less power the PIC draws.

It sounds to me like you're doing a data logging app. Why not
use a 'nice' crystal rate like 1.8432Mhz, which still lets you
get high baud rates easily, while saving a substantial amount of power
over 16Mhz?

Robert

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