#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
void delay();
char Cri_opt[3]; //標準選擇命令碼
char Cha_opt[3]; //通道選擇命令碼
char Xbuff[15]; //數據發送緩沖區
char Rbuff[15]; //數據接收緩沖
uchar Xget;
uchar Xput;
uchar Rput;
uchar Rget;

void send() interrupt 4 using 3 //主設備發送中斷程序    
{
TI = 0; //關閉發送中斷
if(Xput!=Xget) //Xput：發送緩沖區入指針；Xget：發送緩沖區出指針
  {SBUF = Xbuff[Xget]; //發送數據
      Xget = (Xget++)&0x0f; //當數據取空時指針Xget轉到起始位置
    }
  delay(); 
 }

void rece() interrupt 4 using 3 //主設備接收中斷程序
{ RI = 0; //關閉接收中斷
if(Rput != Rget)  //Rput：接收緩沖區入指針；Rget:接收緩沖區出指針