> I've built a kind of chess-clock using a 32768Hz-crystal as > Timer1-oscillator I just noticed that. If the 32k is the period timer, then the frequency for the rest of the chip doesn't really matter, in which case you could use RC for it, as it's only processing instructions. As long as it's fast enough to deal with the output of the timer. Sorry about that -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist