设计要求：

实现与Proteus中的8051单片机进行串行通信。先回顾一下串行通信。在串行通信中有两个引脚分别称为TX和RX。TX引脚用于发送数据，而RX引脚用于接收数据。

原理图和代码就直接放一下好了

#include

#define Baud_rate 0xFD

void SerialInitialize(void);

void SendByteSerially(unsigned char);

void cct_init(void);

sbit Appliance1 = P1^0;

sbit Appliance2 = P1^1;

sbit Appliance3 = P1^2;

sbit Appliance4 = P1^3;

sbit Appliance5 = P1^4;

sbit Appliance6 = P1^5;

sbit Appliance7 = P1^6;

sbit Appliance8 = P1^7;

void main()

{

cct_init();

SerialInitialize();

EA = 1;

ES = 1;

 while(1) {;}

}

void cct_init(void) 

{

 P0 = 0x00; 

 P1 = 0x00;  

 P2 = 0x00;  

 P3 = 0x03; 

}

void SerialInitialize(void) 

{

 TMOD = 0x20; 

SCON = 0x50;

 

 TH1 = Baud_rate; 

 TR1 = 1; 

}

void SendByteSerially(unsigned char serialdata)

{

 SBUF = serialdata; 

 while(TI == 0); 

 TI = 0; 

}

void serial_ISR (void) interrupt 4

{

 

 char chr;

 if(RI==1)

 {

 chr = SBUF;

 RI = 0;

 }

 P0 = ~P0; 

 switch(chr)

 {

 case '1': Appliance1 = 1; SendByteSerially('k'); break;

 case '2': Appliance2 = 1; SendByteSerially('k'); break;

 case '3': Appliance3 = 1; SendByteSerially('k'); break;

 case '4': Appliance4 = 1; SendByteSerially('k'); break;

 case '5': Appliance5 = 1; SendByteSerially('k'); break;

 case '6': Appliance6 = 1; SendByteSerially('k'); break;

 case '7': Appliance7 = 1; SendByteSerially('k'); break;

 case '8': Appliance8 = 1; SendByteSerially('k'); break;

     

 case 'a': Appliance1 = 0; SendByteSerially('k'); break;

 case 'b': Appliance2 = 0; SendByteSerially('k'); break;

 case 'c': Appliance3 = 0; SendByteSerially('k'); break;

 case 'd': Appliance4 = 0; SendByteSerially('k'); break;

 case 'e': Appliance5 = 0; SendByteSerially('k'); break;

 case 'f': Appliance6 = 0; SendByteSerially('k'); break;

 case 'g': Appliance7 = 0; SendByteSerially('k'); break;

 case 'h': Appliance8 = 0; SendByteSerially('k'); break;

 default: ; break;

 }

 RI = 0;

}

好像没什么特别需要注意的