10S计时汇编语言程序设计

ORG 0000H
     AJMP MAIN
     ORG 000BH
     AJMP INTT0
     ORG 0030H
MAIN:CLR P2.7
     CLR P2.6     
     MOV DPTR,#TAB
     CLR A
     MOV R2,#0H
     MOV R3,#0H
     MOV TMOD,#01H
     MOV TH0,#4CH
     MOV TL0,#00H
     SETB EA
     SETB ET0
     SETB TR0
HERE: CJNE R2,#14H,HERE
      MOV R2,#0H
      PUSH ACC
      MOVC A,@A+DPTR
      MOV P0,A
      POP ACC
      INC A
      INC R3     
      CJNE R3,#0AH,HERE

      MOV R3，#00H        ;此处用DJNZ 更方便，只不过R3的初始值要设置为0AH,同时取消INC R3指令（此行上面第二行）    
      CLR A
      AJMP HERE
      ORG 80H
INTT0:MOV TH0,#4CH
      MOV TL0,#00H
      INC R2
      RETI 
TAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
      END