q_dif.asm

51系列单片机的汇编程序包

    ORG 0000H
    AJMP MAIN
    ORG 001BH
    LJMP DS_INT
MAIN:MOV TMOD,#10H
     MOV TH1,#3CH
     MOV TL1,#0B0H
     MOV IE,#88H
     SETB TR1
     SETB P1.0
     MOV R0,#04H
     MOV R1,#14H
LOOP:SJMP $
DS_INT:JB P1.0,HIGH_D
       DJNZ R1,NEXT
       CPL P1.0
       MOV R0,#04H
       MOV R1,#14H
  NEXT:
       MOV TH0,#3CH
       MOV TL0,#0B0H
       RETI
  HIGH_D:DJNZ R0,NEXT
       CPL P1.0
       AJMP DS_INT

       END