Quote Originally Posted by phoenix_1 View Post
Hi mackrackit,
My PIC is 18F4431
I have success with 20MHz XTAL and define osc 20 , fuse HS.
Mine works fine with 20Mhz HS also. It is when I try to run at 40Mhz HSPLL the problem starts. Maybe I have some bad 10s that are running a bit fast???
I have some new 10Mhz on order, find out then.