51单片机~串口通信

（一）计算机串行通信原理：
























综上：所以在设置的时候，经常将SCON设置为0X50==0101 0000 ，使用方式1.

（二）工作：








中断控制 led灯，每发送一条指令灯亮或灭（反转一下）

#include"reg52.h"

typedef signed char int8;
typedef signed int  int16;
typedef signed long  int32;
typedef unsigned char uint8;   //字符型
typedef unsigned int uint16;
typedef unsigned long uint32;

sbit led=P2^0;

void InitUART(void)
{
    TMOD = 0x20;
    SCON = 0x50;
    TH1 = 0xF3;
    TL1 = TH1;
    PCON = 0x80;
    EA = 1;
    ES = 1;
    TR1 = 1;
}

void SendOneByte(unsigned char c)
{
    SBUF = c;
    while(!TI);
    TI = 0;
}

void main(void)
{
    InitUART();
}

void UARTInterrupt(void) interrupt 4
{
    if(RI)
    {
        RI = 0;
        //add your code here!
	    led=~led;
    }
    else
        TI = 0;
}