hi, how does one decide the operating frequency of a crystal oscillator required for a PIC18F452? is there any relation between the supply power and the frequency? the datasheet seems confusing. can anyone also kindly brief on the XT, HS, etc resonators mentioned in the datasheet?
They are roughly proportional to each other.
The higher the frequency range, the more power consumed per hertz. you use the lowest frequency oscillator that runs reliably, if you are worried about power consumption. This depends a bit on how much energy it takes to drive your particular resonant device (Crystals generally run on less power than ceramic resonators.)
You might want to join the technical discussion groups at the Microchip site.
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