On 11/14/06, Przemyslaw Lopaciuk wrote: > > Hi, > I'm using PIC18F8621 with 40 MHz crystal and I've just tested it with an > oscilloscope. > The odd thing is that it shows that the frequency is about 13MHz on both > outputs (X1 and X2). > What could be the reason of it? Load capacitance? There's no way you're pulling it THAT much. It would just quit. Possibly aliasing if this is a digital scope. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist