;并行口輸入輸出測試程序

 ORG   0000H
 LJMP  START
 ORG   0030H

START:
       mov   a, #0FEh
      
Output:
       mov   P1, a
	mov	p2,a
	MOV	p3,a
	mov	p0,a
       RL    a
       call  Delay
      
       Ljmp  OUTPUT

Delay:
       mov   r6, #0
       mov   r7, #0
DelayLooP:
       djnz  r7, DelayLoop
       djnz  r6, DelayLoop
       ret

       end