单片机10分钟（带暂停）倒计时程序

ORG 0000H
     AJMP MAIN
     ORG 000BH
     AJMP INTT0
     ORG 0030H
MAIN:MOV TMOD,#01H
     MOV TH0,#3CH
     MOV TL0,#0B0H
     MOV DPTR,#TAB
     SETB EA
     SETB ET0
     SETB TR0
L2:  MOV R7,#00H
L1:  MOV A,#0
     MOV B,#10
     DIV AB
     SETB P2.2
     SETB P2.1
     SETB P2.0
     MOVC A,@A+DPTR
     MOV P0,A 
     CLR P2.3  
     SETB P2.3
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A  
     CLR P2.2   
     SETB P2.2
     MOV A,#10
     MOV B,#10
     DIV AB
     MOVC A,@A+DPTR
     MOV P0,A 
     CLR P2.1  
     SETB P2.1
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A  
     CLR P2.0  
     SETB P2.0
     CJNE R7,#14H,L1
LOOP1:MOV R6,#20H
      MOV R2,#00H
      MOV R4,#09H
LOOP:MOV R3,#59
HERE:MOV A,R3
     MOV B,#10
     DIV AB
     SETB P2.2
     SETB P2.1
     SETB P2.0 
     MOVC A,@A+DPTR
     MOV P0,A 
     CLR P2.3  
     SETB P2.3
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.2   
     SETB P2.2
     MOV A,R4
     MOV B,#10
     DIV AB
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.1  
     SETB P2.1
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.0
     SETB P2.0
KAIGUAN:JB P2.6,L4
     CLR TR0
L6:  MOV A,R3
     MOV B,#10
     DIV AB
     SETB P2.2
     SETB P2.1
     SETB P2.0 
     MOVC A,@A+DPTR
     MOV P0,A 
     CLR P2.3  
     SETB P2.3
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.2   
     SETB P2.2
     MOV A,R4
     MOV B,#10
     DIV AB
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.1  
     SETB P2.1
     MOV A,B
     MOVC A,@A+DPTR
     MOV P0,A
     CLR P2.0
     SETB P2.0 
     JB P2.7,L6
      SETB TR0
      AJMP L4
L4:CJNE R2,#14H,HERE
     DJNZ R6,$ 
     MOV R2,#00H
     DEC R3
     CJNE R3,#0FFH,HERE
     DEC R4
     CJNE R4,#0FFH,LOOP
     AJMP L2   
INTT0:MOV TH0,#3CH
      MOV TL0,#0B0H
      INC R2
      INC R7
      RETI
TAB:DB 040H,079H,24H,030H,019H,12H,02H,78H,00H,10H
      END

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