>> True, but just using the closest divisor from the 5MHz instruction
>> clock is still far more accurate and stable than a 555 timer.

(you've attributed that to me, it was Olin)

> I'm curious.  Why do you expect the PICs internal (RC, right?) clock
> to be more stable than an external (555 based, and still RC) clock?

At the time the PIC had a 20MHz crystal

You'd need to compare Table 18.8 of the 628 manual to the 555
and timing components datasheets. I suspect you're right, and as
you say it's academic and largely unimportant in this app anyway
in a "normal" temperature range

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