oscillator error is relative, not absolute. That is, if it's 1% out at > 300 baud, it'll also be 1% out at 300k baud. For long packets with > no regular synch, 1% could be significant > Async serial resyncs on every start bit, so that's not really an issue. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .