dingshi.asm

来自「这是用51单片机开发的流水灯程序」· 汇编 代码 · 共 32 行

ORG 0000H
LJMP START
ORG 000B
LJMP  T0INT
ORG 0030H
;主程序
START: MOV SP,#40H
       MOV P2,#FFH
	   MOV A,#1FH
	   MOV TMOD,#01H
	   MOV TH0,#0ECH
	   MOV TL0,#78H
	   MOV R0,#64H
	   SETB EA
	   SETB ET0
	   SETB TR0
DISP: MOV P1,A
     SJMP DISP
;T0中断服务子程序
T0INT:MOV TL0,#78H
      MOV TH0,#0ECH
	  DJNZ R0,QUIT
	  MOV R0,#64H
	  ANL A,#0F0H
	  CLR C
	  RLC A
	  JNC QUIT
	  MOV A,#10H
QUIT:ORL A,#0FH
     RETI
	 END