I never do this unless it is a 20Mhz Xtal with the PIC running at 5V or 
higher.

--Bob

Steve Willoughby wrote:

>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?
>  
>


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