I'm needing to detect ten external interrupts from pulses that can be very short so I won't be able to respond to a port-wide interrupt fast enough to poll the port for the interrupting pin or pins.=20 I could use a one-shot or buskeeper circuit with diode before it but if I could find a micro that had separate interrupt vectors or built-in pin hold I could reduce parts count. At this point I am planning to use a buskeeper circuit and port-wide interrupts, poll the pins, then turn the pins into outputs and clear the buskeepers. Any other ideas would also be welcome! Thanks, Bob --=20 http://www.fastmail.com - Email service worth paying for. Try it for free --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .