Hello again, I thought that I would share my tmr1 resolution on the 16c64 with you all. Two things caused me a lot of grief. 1. Clearing the ccp1con from a compare mode clears the ccp1 pin. 2. False interrupts may be generated when making compare mode changes. Once I established these two possibilities, I was able to write the code to handle their effects. I hope this helps others if they are using the compare mode. Yours, Derrick Early early@finite.nrl.navy.mil