I have been working with the PIC18F458 and have been happily using the simulator. However, I made some changes which caused the tmr0 to stop working. Now, after stripping out my changes and reducing the program, I cannot get tmr0 to work anymore. I even went to the extent of uninstalling and reinstalling MPLAB. I think that the problem is related to the fact that TMR0H:TMR0L no longer decrement. Has anyone seen a problem like this? Robert -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads