Scott Dattalo wrote:
> But what about the other part of what I posted. Is it really
> necessary to double-read PORTB during interrupt-on-change interrupt?

There was some kind of issue regarding that.  I remember a problem a long
time ago that was fixed by doing that, and I've just copied it that way ever
since and haven't had a problem.  It's been so long that I don't remember
the details of exactly what the problem was or why the second read fixed it.
I just looked at the data sheet again, and didn't see a good reason.  Then
again, I sortof remember this was about something that wasn't in the data
sheet...


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