Hi,
i'm working on project of development an electronic abacus. I used assembly on pic16f877a as micro controller. i have encounter a problem where this pic does not have enough i/o pins needed that is total about 65 input pins and 10 pins for output. i have find many solution like using mux or multiple pic.but i have find one solution that attract my interest that is using i/o expander. but the problem is i have no idea how to use it in assembly coding in order to declare the i/o expander. i really hope there is someone can help me solving this problem
i'm working on project of development an electronic abacus. I used assembly on pic16f877a as micro controller. i have encounter a problem where this pic does not have enough i/o pins needed that is total about 65 input pins and 10 pins for output. i have find many solution like using mux or multiple pic.but i have find one solution that attract my interest that is using i/o expander. but the problem is i have no idea how to use it in assembly coding in order to declare the i/o expander. i really hope there is someone can help me solving this problem