//--------定時初始化--------
void time_int()
{TMOD=0x10;
 TH0=0x018;
 TL0=0x010;
 PT0=1;
 EA=1;
 ET0=1;
}
//----------定時中斷-------------
void ding2()interrupt 1 using 1
{ TH0=0x018;
  TL0=0x010;
  scd=1;
}