Jinx wrote:
>
> Ooops, forgot to mention the obvious point - if you have an
> accurate stable crystal frequency then you don't need WDT.
> A 32.768kHz crystal with maximum prescaler will overflow
> every (32768/4) * 65536 * 256 = 2048 seconds (34m8s),
> which is a lot less often than WDT, but you have the extra
> current draw by having Timer1 running


As an alternative solution, the PIC draws very little
current when running at *very low* speeds. For some apps
it might be best to run the PIC at a couple of kHz
and get uninterrupted timing AND the same average current
as sleep/run alternating.
-Roman

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