>>It seems to work. After 20 hours running the PIC has run ~ 10 seconds too
>>fast, or about 1 in 1000. Is this to be expected without tuning a C? I use
>>a 16F84-10 with 10 MHz Xtal and tow 20 pf C's.
>
>I think 1 in 1000 (0.1%) is a pretty bad value unless you are using an RC
>circuit for a clock or running at temperature extremes.

10 seconds in 20 hours is more like 1 in 7200, for .015%   That's
better...seems like hobby grade crystals used to be .005% or .01% so
that's not so bad.  It's always good when you come out high
because you can add a little more picofarads to get down to
the frequency you want.

Barry

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