Re: [PICLIST] [PIC] Interrupt on change by Thomas McGahee .

What you want to do is clear the interrupt flag right after you save the registers at the beginning of the ISR and determine that the source of the interrupt was the interrupt-on-change. As soon as you finish processing the interrupt check the flag again to see if ANOTHER interrupt occured during processing. If so, handle it by doing a GOTO to the place where you initially cleared the flag in the interrupt before. If the flag is NOT set, then you exit the ISR in the usual way. This will catch as many interrupts as possible, but ANY method is going to fail if the interrupts come in so fast you can't process them! Fr. Thomas McGahee {Original Message removed}