ex-2.asm

来自「发光二极管&LED显示程序清单 方波输出以及BEEP蜂鸣程序清单」· 汇编 代码 · 共 46 行

ORG 0000H
LJMP start
org 000bh
LJMP SERVE
org 0030h
START:
      MOV SP,#60H
      MOV R0,#00H
      MOV R7,#00H
      CLR P1.0
      SETB P1.1
      MOV B,#02H
      MOV TMOD,#01H
      MOV TH0,#3CH
      MOV TL0,#0B0H
      SETB ET0
      SETB EA
      SETB TR0
      SJMP $
SERVE:
      MOV TH0,#3CH
      MOV TL0,#0B0H
      DJNZ B,CONTI
      MOV B,#02H
NEXT:
     CPL P1.0
     JNB P1.0,CONTI
     INC R7
     MOV A,R7
     SUBB A,#150
     JC CONTI
     MOV A,R7
     MOV R4,B
     MOV B,#5;;;
     DIV AB
     MOV R3,B
     MOV B,R4
     CJNE R3,#0,CONTI
     CPL P1.1
     INC R0
     CJNE R0,#8,CONTI
     MOV R0,#0
     MOV R7,#0
CONTI:
      RETI