> any way of setting the internal RC oscilator on 16F627 > to its maximum ?? The internal RC oscillator is fixed at 4MHz (PCON.3 = 1) or 37kHz PCON.3 = 0). If you're talking about ER (external resistor) mode, there's no chart AFAIK to help set the frequency. Drawing one up is something I'd planned to do in the next day or two. I'll post it, but I have only the -04 parts to hand, the -20 will have to wait -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body