左右循环灯

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* 缙云职业中专 zhouchanghong *
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             ORG 0000H
             LJMP MAIN
             ORG 0030H
MAIN  :MOV P1,#0FFH
             MOV A,#00H
MAIN2 :MOV A,#0FEH
MAIN1 :MOV P1,A
              ACALL DEL1S
              RL A
              JNB P1.7,MAIN0
               LJMP MAIN1
MAIN0 :RR A
              MOV P1,A
              ACALL DEL1S
              JNB P1.0,MAIN2
              LJMP MAIN0
DEL1S :MOV R5,#200
D1         :MOV R6,#250
D2         :MOV R7,#10
D3         :DJNZ R7,D3
                DJNZ R6,D2
                DJNZ R5,D1
                RET
                END