I use interrupts on change in combination with 2
rotary encoders. PB7 together with PB0 and PB6 with
PB1.
No prob's at all. Use the internal pull-ups. Enable
the Interupt on Change and Global Interupt.
When an interupt occurs you have to check whole portb.

grtz

Simon

 --- Claudio Tagliola <cptagliola@CHELLO.NL> 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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