piclist 2002\08\03\172406a >
Thread: Has any one ever got a PIC 18F244 chip to work at 40mhz
www.piclist.com/techref/microchip/devices.htm?key=18F
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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"
frequency?

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


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<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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