跑马移位.asm

单片机实验：跑马灯

   org 0000h
   ajmp  start
  org  0030h
start:   mov a,#01h         
loop:    mov p1,a
         acall  delay
         rl  a
         ajmp  loop
delay:   mov r5,#1h
 del0:   mov  r6,#20h
del1:	 mov  r7,#248
 del2:   djnz  r7,del2
         djnz  r6,del1
		 djnz  r5,del0
		 ret
		 end