ex_2.c

MAX232的串口的驱动

#include "reg52.h"

sbit P1_0	=P1^0;

void DELAY();

main()
{
unsigned char i;
	TMOD=0X20;		//设置T1为方式2
	TH1=0XFD;		//设置波特率为9600
	TL1=0XFD;
	SCON=0X50;		//设置串口位方式1
	PCON=0X00;
	TR1=1;			//定时器1开始计数
	do
	{
		while(RI==0);	
		RI=0;
		i=SBUF;
	}while(i!=0x55);
	SBUF=0X41;
	while(1);
}