I'm designing a few simple PIC circuits, but I'm running into 
one area where my EE fu is lacking (not that that's a big surprise)...

I can follow the Microchip datasheets in selecting the appropriate
caps for a crystal or ceramic resonator (or just take the built-in
caps if I get a resonator w/caps), but Microchip says to take care
not to overdrive the crystal/resonator and put a series resistor
between the OSC2 pin and the crystal/resonator "if necessary".

How do I tell if that's necessary, and what value of resistor to
use?
-- 
Steve Willoughby     | "It is our choices... that show what we truly 
<steve@alchemy.com>  | are, far more than our abilities."
                     |     --Albus Dumbledore, in Harry Potter and the 
                     |            Chamber of Secrets, by J. K. Rowling

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