8031.asm

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 ORG   0000H

START:
       mov   a, #0fEH
       mov   r5, #8
Output:
       mov   P0, a
        mov   P1, a
        ； mov   P2, a
         mov   P3, a
       rl    a
       Acall  Delay
       djnz  r5, Output
       Sjmp  START

Delay:
       mov   r6, #0
A1:    mov   r7, #0
DelayLoop:
       NOP
       NOP
       djnz  r7, DelayLoop
       djnz  r6, A1
       ret

       end