Dave Turner wrote: > I just discovered whilst reading the datasheet that intrc isn't > actually the internal 8mhz osc, but an internal RC (well, duh, but I > didn't notice). They are the same thing. The internal 8MHz oscillator is implemented as an R/C oscillator. I sortof remember (this means it's your job to check) that this PIC has one of the new "precision internal oscillators". If so, it should be good enough to talk to Hyperterm on a PC, but only if it's calibrated. Again, I don't have the data sheet here, but on many PICs the calibration value is stored somewhere special and your program has to fetch it and write it to OSCCAL. This may not apply to you. In any case, read the data sheet section on the internal oscillator carefully (actually, read the whole thing carefully). ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist