thanks erik
ill try so explain my problem again i hope this time it be clear

what i wanna do is when i get intrupt on ext0
i scan port 1 and see which pin has been trigred
and each pin has a spacific usage and iam not using all
the pins of the port i only use 5 pins
p1.0 ,p1.1,p1.2,p1.3,p1.4