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51单片机~串口通信(讲解+代码)

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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;
}



转载:https://blog.csdn.net/qq_51523386/article/details/116019860
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