>
>
> So, even if I could trust the measurements I make when trimming,
> I've gone off trimming these units anyway


Yeah, trimming is a PITA.

> If the crystal wants about 16pF, then yes, but the data sheet you
> > sent dosen't say
>
> I can compensate for a frequency error in s/w, but 22pFs would
> be close enough to not do any long-term physical damge ?


I don't think it's possible to damage the crystal JUST by having too small a
cap.. What's the drive level vs the spec?   What's the oscillation margin
(negative resistance)?  Overdriving is a frequently neglected source of
problems.

I'd be very tempted though, to fix it right by getting the loading caps up
to the right value, at least so the crystal is singing within spec'd
tolerance.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist