piclist 2002\08\03\172406a >
Thread: Has any one ever got a PIC 18F244 chip to work at 40mhz
face BY : Jim email (remove spam text)

Are you sure that any of your "over 20 MHz crystals"
are fundamental crystrals at this "over 20 MHz"

Odds are, that all those "higher-frequency crystals"
are actually "overtone" crystals and as such their
"overtone frequency" is stamped on the outside.

I would then place money on a bet that the simple
little oscillator used on the PIC chips *only*
oscillates at the lower "fundamental" frequency
of those crystals ...

(All this comes from the perspective of a radio engineer
who has done work with crystals in communications gear
in the (now-distant) past ...)

RF Jim

{Original Message removed}
<00af01c23b31$1de3cd60$0100a8c0@piii500a> 7bit

See also: www.piclist.com/techref/microchip/devices.htm?key=18F
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Subject (change) Has any one ever got a PIC 18F244 chip to work at 40mhz

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