> I wrote a program for a 16F84A and first tested it out on a 4Mhz chip.
It
> worked fine but when burning the program on a 20Mhz 16F84A and changing
the
> ceramic resonator, it doesn't function at all.  Just out of curiosity, I
> turned off the circuit, put a 4Mhz ceramic resonator in place of the
20Mhz
> one and it worked with the 20Mhz PIC.  Any ideas?

Forgot to change from XT to HS oscillator mode?


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