Hi all,

I'd like to know how to check that the osccilator is working as requested. I mean how do I know exactly that the external crystal is working at 8 Mhz

I made some experiment with 18F4431, the program run well with internal oscilator setup 4Mhz, but it does not function when I switch to external crystal
I am using easypic 4 board.

Thanks,

Johan