Added the tag for you.

William Chops Westfield wrote:

> So I have these 12f chips, with 5 outputs and one input.
>
> I figure I should connect something up to the input, so I can have some
> control over what happens on the outputs.  switches and serial data are
> both interesting, but the immediate idea is to connect an IRRC receiver
> there, so I can control my PIC with my TV's remote.
>
> This is an ideal application, I would think, for interrupts.  Set the
> input to interrupt on change to get the "leading edge" of the sequence,
> then use the timer to get several subsequent interrupts at where the
> data bits ought to be, and go back to 'change on interrupt' when it's
> all done.  Piece of cake...
>
> 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?
> You can assume that the output pins are driving a multiplexed array of
> LEDs, and the IRRC would be used to select a particular pattern, or
> something like that.  So it's not CRITICAL that the commands be
> detected immediately, but it would be annoying to have the commands
> detected a couple bits late a significant percentage of the time...
>
> Thanks
> Bill W
>
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