In my project, i want to control 16 relays in sequence
used P2,P0 (set relay 1 on in #A seconds,then clr relay 1 in #B seconds, then set relay 2 in A seconds then clr relay 2 in B seconds, continuit to relay 3, 4, 5,...1).

The timeset A, B can be incremented or decremented by input switch and display on LCD (used 4bit data, T1602B)

But i faced to some problems, call subroutine, reading input switch to jump to subroutine, now i am tired of seeing what my code is, it is too long

Could anyone gives me some advice to solve this ?

Thanks