Jinx wrote:
> Does it matter which capacitor (the one on OSC1 or OSC2)
> is variable to trim the crystal frequency ? I've looked in all the
> MChip oscillator pdfs I can find but they don't say. Maybe it
> doesn't matter or maybe they left it out

I think the one on the oscillator input pin (can't remember off the top of
my head whether that's OSC1 or OSC2) would be the better choice for using as
a trimmer.

But why do you want to do this?  You'd be adjusting to within a few pF and
then hoping that nothing else changes, like the temperature or the age of
the crystal.  Why not just buy a more accurate crystal?  How accurate do you
need?  You can get crystals down to 20ppm or so.  After that it gets more
complicated with whole oscillator circuits in temperature controlled cans.
After that it gets way more complicated, large, heavy, and expensive.


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