The biggest thing I got from that discussion is, don't use the rest of
port B for anything else.  If you only use IOC for port B you'll
be OK.  If you try to read or write port B otherwise, you'll have
to know more about the issues.

Barry

At 07:14 PM 4/10/02 +0200, you wrote:
>Hello all,
>
>
>I know this issue has passed the revue a dozen times already, however, I
>can't find any usefull things from the archives.
>
>I have two motion sensors which put out two PWM signals each. I want to
>measure the length of those four PWM signals (this is the action
>anglular data of the sensors). Now, with the PIC16F874 I use, I have two
>options: use a capture register or use interrupt on change. Problem with
>the capture is, I only have two. From the IOC ports RB7:RB4, there are
>four. However, I remember a lot of words of caution when using the IOC
>feature. If I have those four digital input signals only on those ports,
>can I use this safely? And what were the all-too-familiar problems with
>Interrupt on Change again?
>
>
>Best Regards,
>
>Claudio
>
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