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。
8051微控制器具有这两个引脚，因此它支持串行通信，并且这些引脚位于AT89C52微控制器的10号和11号引脚上。
首先，将对此项目进行原理图设计（如下图），在端口1上连接8个LED，并通过串行端口发送字符来打开或关闭这些LED。设计完原理图之后，我们将为8051微控制器设计编程代码，并测试结果。
#include <reg52.h> #define Baud_rate 0xFD // BAUD RATE 9600 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) //initialize cct { P0 = 0x00; //not used P1 = 0x00; //Used for Appliances P2 = 0x00; //not used P3 = 0x03; //used for serial } void SerialInitialize(void) // INITIALIZE SERIAL PORT { TMOD = 0x20;// Timer 1 IN MODE 2 -AUTO RELOAD TO GENERATE BAUD RATE SCON = 0x50;// SERIAL MODE 1, 8-DATA BIT 1-START BIT, 1-STOP BIT, REN //ENABLED TH1 = Baud_rate;// LOAD BAUDRATE TO TIMER REGISTER TR1 = 1;// START TIMER } void SendByteSerially(unsigned char serialdata) { SBUF = serialdata; // LOAD DATA TO SERIAL BUFFER REGISTER while(TI == 0);// WAIT UNTIL TRANSMISSION TO COMPLETE TI = 0;// CLEAR TRANSMISSION INTERRUPT FLAG } void serial_ISR (void) interrupt 4 { //receive character char chr; if(RI==1) { chr = SBUF; RI = 0; } P0 = ~P0; //Show the data has been updated 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; //do nothing } RI = 0; }
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