1)for using ports as input first we must write ffh to this port..initially all ports have ffh on it ....in my project i use port3 for input.and i must read this port 4 times...after first reading will i make port3 ffh again...
2)another help about register banks...is it necessary to select one of them at the begining or if no bank selected...the microcont. use bank0 as default...
3)is there any command to end the program like hlt....or is it suitable to use infinite loop....
4)is it possible to call a subrt. in a subrt.
thanks all...