8051 development board Exp.8 74ls14 74hc14 reverser assembly code tutorial

org 0000h
ajmp main
org 0080h
main: mov a,#0
loop: mov p1,a ; P1 port output
call delay ; keep on for a while
inc a ; show next figure
jmp loop
delay: mov r5,#50 ;call delay
d1: mov r6,#40
d2: mov r7,#248
djnz r7,$
djnz r6,d2
djnz r5,d1
ret
end