> >> > given recent advice on the fact that portb interrupt on change
> >> > can be unpredicatable
>
> And the reason I gave that advice is
>
> 1) AN566 and in my case it didn't help.
>
> 2) I read the previous threads

> in a general case where interrupts are asynchronous and
> unpredictable and other PORTB pins are being used, then
> IOC is not suitable

That's what I remember as the gist of the previous threads, but
I couldn't be certain (and James didn't say if anything else was
on PortB) , which is why I suggested he look into it. It looks as
though you've given James good advice, he'll be OK with INT

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