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MOV P2,#02H ;MC2 on
MOV R5,#04H
ACALL DELAY
DJNZ R1,MC2
MOV P2,#04H ;MC3 on
MOV P1,#B0H ; 3
MOV R5,#20H ; 4s
ACALL DELAY
MOV R1,#03H ;3 次
MC3: MOV P2,#00H ;MC3 off
MOV R5,#04H
ACALL DELAY
MOV P2,#04H ;MC3 on
MOV R5,#04H
ACALL DELAY
DJNZ R1,MC3
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