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MOV P2,#08H
MOV R5,#04H
ACALL DELAY
MOV P1,#B0H ;3
MOV P2,#04H
MOV R5,#04H
ACALL DELAY
MOV P1,#A4H ;2
MOV P2,#02H
MOV R5,#04H
ACALL DELAY
AJMP START
;----------------------
DELAY: MOV R6,#FAH
DE1: MOV R7,#FAH
DE2: DJNZ R7,DE2
JNB P0.3,STOP
DJNZ R6,DE1
JNB P0.3,STOP
DJNZ R5,DELAY
JNB P0.3,STOP
RET
;-----------------------
STOP: AJMP BEGIN
;-----------------------
END