> Regarding your question about capacitance.  There are series cut crystals=
 and
> parallel cut crystals.  You can use either one in a given circuit and it =
will work.
> However, it won't be ideal,  and if you use a parallel crystal in a serie=
s circuit,
> the frequency of the crystal won't be what it is stated to be.  and vice =
versa for a
> series cut crystalin a parallel circuit.  What this boils down to is use =
the correct
> crystal for the circuit you have.

My understanding is that the crystal manufacturers not only tweak the reson=
ant frequency so that the stated frequency is on the required parallel or s=
eries resonant point, but that they can make other tweaks that make the cry=
stal more reliable in the designed mode of operation, and if used in the ot=
her mode may not oscillate reliably, or may jump to other frequency spurs t=
hat may not affect the designed mode.
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