/*//兩個單片機通訊，使用中斷法


#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=0xf3;  //bode=2400
	TL1=0xf3;
	ET1=1;
	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
}

*/
























#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
uchar aa;
void  init()
{
     TMOD=0x20;
	 TH1=0xfd;
	 TL1=0xfd;
	 TR1=1;
	 
	 SM0=0;
	 SM1=1;
	 REN=1;
	 
	 
}
void  main()
{
     init();
	 P1=0xff;
	 aa=P1;
	 SBUF=aa;
	 while(TI!=1);
	 TI=0;
	 
	 EA=1;
	 ES=1;

	 P1=0xff;
	 aa=P1;

	 while(1)
	 {
	
	    if(aa!=P1)
		   {
			   P1=0xff;
		       aa=P1;
		       SBUF=aa;
			}

	  }

}
void ser ( ) interrupt 4 
{
      if(RI==1)
	    {
	        P2=SBUF;
	        RI=0;
		 }
      else TI=0;
		 
}