Which brings up another point:

I've been using 1/(2*pi*R*C) to determine the PIC frequency using an RC
oscillator circuit.  Not being an EE, I'm not sure if this is entirely
correct, but it seems to be in agreement with what I see happening with the
PIC when I use it in my application.

Anything wrong with doing it this way?

e.g., an 18pF cap with (2) 4.7Kohm resistors in series gives me
approximately 4.25us per cycle, or 941 KHz input frequency, at least by my
calculations.

Please correct me if I'm mistaken.

--Andrew

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