I'm experimenting again. This time its PWM on a 16F6XXa. The datasheet gives no example of how to intialise this mode (as it does for comparators and Vref). Is it straight forward to generate a (for example) 4KHz tone through an 8 ohm speaker? Or do I have a bunch more reading to do? Rob -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu