>
>I presume the trimmer cap goes on the OSCIN pin. Yes?

Either. You're adjusting the total capacitance across the crystal. Both
caps are in series from the circuit's point of view.


>Also, I was wondering how sensitive/accurate the timing would
>be relative to the trimmer cap value changing with temperature
>variations.

Proportional, relatively linear.
Temperature compensation is a whole 'nother project.  The xtal has it's own
curve, and you should try to negate that with the curves of the caps.
That's the short version anyway.  The chip also plays in this, at least as
far as it's input C varies over temperature.


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