>Image was taken from
>    DS30292B-page 123 (PIC16F87X 28/40-pin
>8-Bit CMOS FLASH Microcontrollers).
>    Rs may be required in HS mode, as well
>as XT mode, to avoid overdriving crystals
>with low drive level specification.
><< resistor.gif >>


I noticed that it says "May be required for AT strip cut crystals."

Is that what you're using?  Series and parallel cuts behave differently, I
think.  I don't know any more than that.  All I know is that I use their
recommended crystals and never used a series or parallel resistor.  And
everything works just fine.

--Andrew

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