> Except when i read the documentation more carefully, I see that the IoC
> interrupt is cleared by any IO to the port, and my outputs are being
> driven all the time.  There is even a caveat that IoC interrupts may be
> missed entirely if the transition occurs during an IO instruction to the
> port.  Hmmph.  That doesn't sound good.  Does anyone have any
> experience with how much trouble this is likely to be in real life?

Interrupt-on-change should be renamed "wake-up-on-change" because it's
useless on a running processor.

Cheers,

Bob

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