8051学习笔记——232通信

 1 #include <reg51.h>
 2 
 3 int flag = 0;
 4 unsigned int Send_Data,Recv_Data;
 5 
 6 void main()
 7 {
 8     SCON = 0X50; //MODE 2
 9     TMOD = 0x20;  //MODE 2
10 
11     TH1 = 0XFD;
12     TL1 = 0XFD;
13 
14     TR1 = 1;
15     ES = 1;                    //开串口中断 
16     EA = 1;
17 
18     while(1)
19     {
20         if(flag == 1)
21         {
22             SBUF = Send_Data;
23             while(TI == 0);
24             TI = 0;    
25             flag = 0;
26         }
27     }
28 }
29 
30 void ser_int() interrupt 4                //3定时器1的中断号  1定时器0的中断号 0外部中断1 2外部中断2  4串口中断
31 {
32     if(RI == 1)
33     {
34         RI = 0;
35         Recv_Data = SBUF;
36         Send_Data = Recv_Data;
37         flag = 1;
38     }
39 }