> ...and what can cause my PIC16F84A-20P to work with a 4MHz resonator but
not
> a 20MHz resonator?

XT instead of HS oscillator mode, for one.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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