Shouldnt CLRF TMR0 clear the timer0 (location 0x01) ?? Single stepping thru, it TMR0 doesnt seem to behave. Or maybe in single step it won't because it relies on the clock to run it (the option reg is set to a 0x40) _________________________________________________________________ Click here for a FREE online computer virus scan from McAfee. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads