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TL16C554接收数据卡住的问题

Other Parts Discussed in Thread: TL16C554

我搞TL16C554,用查询方式接收。
现在可以接收到数据,可是只能接收两三个数据,就会卡住。
程序如下:
do
  {
   dat=Read_LSR(1);
   _nop_();
  }while(!(dat&0x01));
  LED1=~LED1;
   dat1=Read_RBR(1);
   _nop_();
   Write_THR(1,dat1);
    _nop_();
请高手支招,谢谢!