Hi all:
I am having a hell of a time programming the pic18f4550 due to its so many clock options. I have been able to get every thing to work if i use a 4MHz ceramic resonator and the XT option from the fuse config menue. The problem occures when i use a 20MHz resonator.
I use the command Define osc 20 but the timing is still off. I tried to send serial data and the timing is all off.
any ideas

thanx


sam