11-串口通信

#include "reg52.h"

sfr AUXR = 0x8e;

unsigned char urdat;

void InitUart()
{
	TMOD = 0x20;
	TH1 = 0xfd;
	TL1 = 0xfd;
	TR1 = 1;
	
	SCON = 0x50;
	AUXR = 0x00;
	ES = 1;
	EA = 1;
}

void SendByte(unsigned char dat)//发送
{
	SBUF = dat;
	while(TI == 0);
	TI = 0;
}

void ServiceUart() interrupt 4 //接收
{
	if(RI == 1)
	{
		RI = 0;
		urdat = SBUF;
		SendByte(urdat + 1);
	}
	
}



void main()
{
	InitUart();
	SendByte(0x5a);
	SendByte(0xa5);
	while(1);
}