51单片机汇编秒表程序
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ORG 0000H
LJMP MAIN
ORG 0003H
LJMP INT_0
ORG 000BH
LJMP T0_INT
ORG 0013H
LJMP INT_1
ORG 001BH
LJMP T1_INT MAIN:
MOV TMOD,#11H
MOV TH1,#0D8H
MOV TL1,#0F0H
MOV TH0,#3CH
MOV TL0,#0B0H
SETB EA
SETB ET1
SETB ET0
SETB EX0
SETB EX1
SETB IT0
SETB IT1
SETB TR1
MOV 32H,#00H
MOV R1,#80H
MOV 30H,#00H LOOP:
MOV A,R4
CJNE A,33,Y
MOV A,R5
CJNE A,32H,Y
INC 30H
Y: MOV A,P3
CJNE A,#0CFH,Y1
LJMP Y2
Y1:
MOV A,30H
CJNE A,#01H,LOOP
CLR P1^0
LCALL DELAY2
SETB P1^0
LCALL DELAY2
LJMP LOOP
Y2:
JNB P3^5,Y2
JNB P3^4,Y2
MOV R3,#0AH
LJMP Y3
Y3: MOV R4,33H
MOV R5,32H
MOV A,P3
CJNE A,#0DFH,Y5
Y4:JNB P3^4,OUT
JNB P3^5,Y4
INC 32H
MOV A,32H
CJNE A,#10,Y3
INC 33H
MOV 32H,#00H
LJMP Y3
Y5:
MOV A,P3
CJNE A,#0EFH,Y3
Y6: JNB P3^5,OUT
JNB P3^4,Y6
MOV A,32H
CJNE A,#00,JJ
DEC 33H
MOV 32H,#09H
LJMP Y3
OUT:JNB P3^5,OUT
JNB P3^4,OUT
MOV R5,#00H
MOV R3,#00H
LJMP LOOP
JJ:
DEC 32H
LJMP Y3
INT_0:
CPL TR0
RETI
INT_1:
MOV R6,#00H
MOV R5,#00H
MOV R3,#00H
MOV R0,#00H
MOV 30H,#00H
T0_INT:
MOV TH0,#0D8H
MOV TL0,#0F0H
INC R0
CJNE R0,#0AH,T0_END
MOV R0,#00H
INC R6
CJNE R6,#0AH,T0_END
MOV R6,#00H
INC R5
CJNE R5,#0AH,T0_END
MOV R5,#00H
INC R4
CJNE R4,#0AH,T0_END
MOV R4,#00H
INC R3
CJNE R3,#0AH,T0_END
MOV R3,#00H
T0_END:RETI
T1_INT:
MOV TH1,#0D8H
MOV TL1,#0F0H
CJNE R1,#04H,NEXT1
MOV R1,#80H NEXT1:
CJNE R1,#80H,NEXT2
MOV P2,R1
MOV A,R6
MOV DPTR,#TAB
MOVC A,@A+DPTR
MOV P0,A
AJMP NEXT6 NEXT2:
CJNE R1,#40H,NEXT3
MOV P2,R1
MOV A,R5
MOV DPTR,#TAB
MOVC A,@A+DPTR
AJMP NEXT6
NEXT3:
CJNE R1,#20H,NEXT4
MOV P2,R1
MOV A,R4
MOV DPTR,#TAB
MOVC A,@A+DPTR
MOV P0,A
AJMP NEXT6 NEXT4:
CJNE R1,#10H,NEXT5
MOV P2,R1
MOV A,R3
MOV DPTR,#TAB
MOVC A,@A+DPTR
MOV P0,A
AJMP NEXT6 NEXT5:
CJNE R1,#08H,NEXT6
MOV P2,#40H
MOV P0,#7FH
AJMP NEXT6 NEXT6:
MOV A,R1
RR A
MOV R1,A
T1_END:RETI
DELAY2:MOV 7DH,#250
DEL11:DJNZ 7DH,DEL21
DEL21:NOP
NOP
NOP
NOP
NOP
NOP
NOP
MOV A,7DH
CJNE A,#00H,DEL11
RET