>Series cut .. Parallel cut - How does one figure out which applies to the
>crystal in question.  I just looked at EVERY crystal in Digikey, and NONE

Every crystal will run in both modes, but.....
as I understand it when the crystal is ground to frequency there are tweaks
they can do to minimize the spurious responses in each mode, and what is
best for parallel mode ain't necessarily best for series mode. It also
affects things like the ESR in series mode, and similar parameters in
parallel mode that may determine if it will oscillate in that mode unless
you have a very determined oscillator circuit.

This is apart from the slightly different frequency of operation between the
two modes. For PIC use unless you are going for absolute frequency accuracy
then you will not see the difference in frequency.


>I guess the correct method is to use a CRYSTAL ball.  <Groan>

I think this comes into the "see through a glass darkly" mode.

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