I thought that any change to a running timer caused a 2 cycle skid. Is that not still the case? dwayne At 08:45 PM 5/21/2008, Mark Rages wrote: >I think there must be a difference between mid-range (which you were >referencing) and 18F (which I was referencing) parts. But the 30F5011 >that Mario is using is different still. It is a 16-bit part and >doesn't need the high/low synchronization hack. So your idea will >work: Mario can just "bset TMR1,15" in the timer1 ISR. -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist