Interrupt on Change with 16F886

[richard]

You are right. I forgot to note that col and rows are connected to a keyboard matrix 3x4.

but how is it wired , what will make the columns change state the rows are set to all 1's the initial col port pins are set to all 1's
where can a o come from ?

usually a zero or a one is walked down a row or col

[Ioannis]

Well, I have to work the project on the morning and not late at night...

I missed that portb=0 obviously and just focused on the Interrupt itself and the settings...

Ioannis