Hi, I am having problems with the interrupt on Tmr1 on a C73. I have it configured to interrupt from a RC0, I set Tmr1H and Tmr1L to $FF. The first time a +ve edge comes along I get the interrupt, which is then followed by 3 other +ve edges, I do what I have to do, then on leaving the interrupt handler set Tmr1H and Tmr1L back to $FF and clear the Tmr1IF ready for the next time. The next +ve edge comes along and gets ignored. The one after that causes an interrupt and off I go, but this time I am one edge out of sync. Anyone got any ideas? Thanks and regards, Mike Watson