I just remember that the Atmel Xmega series have buskeepers for any
pins. I was planning to use an Xmega32E5 so It looks like I don't need
any extra parts.

Thanks, Bob

On Tue, Nov 18, 2014, at 11:09 AM, Bob Blick wrote:
> 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
>=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.
>=20
> 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.
>=20
> Any other ideas would also be welcome!
>=20
> Thanks, Bob

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