On Mon, Dec 20, 2010 at 8:12 AM, Olin Lathrop w= rote: > 6 - If I remember right, 20MHz crystal doesn't work with USB. =A0Did you = read > the datasheet before designing the circuit? =A0I didn't think so. =A0Go r= ead it. > Now it is your turn to read the datasheet ... --=20 Xiaofan --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .