Ooopsie, sorry about the typo. Probably obvious, but just in case > For example, at a lower speed, 3.2768MHz > Fosc = 819200Hz, /256 = 3200 TMR0 rollovers/sec. Set pre-scaler > to /32 for 100Hz interrupt Fosc is 3.2768MHz, 819200Hz is the TMR0 count rate -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body