Hello All Again, Another IOC question: what happens if a pin on portb changes while i'm busy with the interrupt handler from a previous pin change? I'm using four timed PWM modulated signals which could come very close together, so the chance of collosion is quite high. Regards, Claudio -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu