Hi, I was wondering if anyone could provide some oscillator guidance. I am trying to run a 16f690 off a 20 mgherz ceramic resonator with built in capacitors. I think i have all my my programming correct, but when I go to turn it on, it does not work. The oscillator does not start up. However, if I try to measure the voltage with my multimeter and touch the Clock input pin, the PIC starts to work. There is about 2.3V on the clock output and input pin . Right now i have a 1 mega Ohm resistor across the input and output leads of the resonator like the datasheet said for it to have. I am running the resonator in HS mode. My guess is that my programming is correct but there is not enough drive to get the oscillator going. Unfortunately, I have no idea about how to fix the problem. This is my first oscillator circuit which I am using for a school project. Anyone have any ideas? Thanks, Adam Stambler -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist