My application require lots of things to be done at the same time, one port is to for taking input other to sent data to displaying on 7-segment , also the other port is activating 8 different relays. Each input is to be treated separately.
Port 1 each pin wait for input
POrt 2 sends data to 7-segment
etc ..the describtion is too long but objective is to do lots of things at the same time treating each input bit action separately as done in the state machine example on this web.