> The datasheet seems to indicate a max variation of +/- > 5%, but I don't have a benchmark to compare that against.=20 Write a small clock program and compare it with one on the wall or a 32kHz crystal on T1OSC. You could toggle a seconds LED and a minutes LED 1% per hour is 36 seconds and the PIC might be obviously fast or slow. You'll probably get an idea of its outness after only a minute or two Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .