boxing.asm

这个文件通过修改计时器初值

INPUT BIT P1.0
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP TIME0
ORG 0030H
MAIN: MOV TH0,#50H
   MOV TL0,#23H
  MOV TMOD,#01H
  SETB TR0
  SETB ET0
  SETB EA
  CLR INPUT
AJMP $	   
TIME0: PUSH ACC
  PUSH PSW
  CPL P1.0
  JB P1.0,ANOTHER
  MOV TL0,#23H
  MOV TH0,#50H
  AJMP STOP
ANOTHER: MOV TL0,#50H
   MOV TH0,#23H
 STOP: POP PSW
  POP ACC
 RETI
END