#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define key_port P1
#define dis_port P2

void main (void)
{
	uchar key_in=0xff;
	SCON=0x50; //MODER1,REN=1;
	TMOD=0x20; //TIMER1 MODER2;
	TH1=0xfd;  //bode=2400
	TL1=0xfd;
	TR1=1;
    EA=1;
	ES=1;
	while(1)
	{		
	  if (key_in != key_port)
	  {
			key_in = key_port;
			SBUF=key_in;
		  }
	}
}

void get_disp (void) interrupt 4 using 0
{
	if(RI)			//如果是串口輸入引起中斷
	{
		 dis_port = SBUF;
		 RI=0;
		}
	 else TI=0;		//否則就是串口輸出引起的中斷
}