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; 七段顯示器-> 0，1 , 2 , 3 , 0

ORG 0H
SJMP BEGIN
;------------------------
ORG 30H
BEGIN: MOV SP,#07H
MOV P1,#C0H ;0
MOV P2,#00H ;RELAY OFF
;-----------------------
WAIT: JNB P0.3,BEGIN
JNB P0.1,SURE
SJMP WAIT
;------------------------
SURE: MOV R5,#01H
ACALL DELAY
JNB P0.1,START
SJMP WAIT
;-----------------------
START: MOV P2,#01H ;MC1 ON
MOV P1,#F9H ; 1
MOV R5,#10H ; 2s
ACALL DELAY
MOV R1,#03H ;3 次
MC1: MOV P2,#00H ;MC1 off
MOV R5,#04H
ACALL DELAY
MOV P2,#01H ;MC1 on
MOV R5,#04H
ACALL DELAY
DJNZ R1,MC1
MOV P2,#02H ;MC2 on
MOV P1,#A4H ; 2
MOV R5,#18H ; 3s
ACALL DELAY
MOV R1,#03H ;3 次
MC2: MOV P2,#00H ;MC2 off
MOV R5,#04H
ACALL DELAY