89c52串口发送接收小示例

//串口发送

void sendChar(char *p)//调用前关中断，调用完成后关中断
{
 while(*p != '\0')
 {
  SBUF = *P
  while(!TI);

  TI = 0;
  p++;
 }
}

//串口接收

//串口初始化

void series_init()
{
 SCON = 0x50; //串口工作方式1，允许接受
 TMOD = 0x20; //定时器T1工作方式2
 TH1 = 0xfd;TL1 = 0xfd; //定时初值
 PCON &= 0x00; //smod = 0
 TR1 = 1； //开启定时器1
 EA = 1;ES = 1; //开总中断可串行终端
}

unsigned char ReceiveBuf;
//串行中断服务函数
void series() interrupt 4
{
 RI = 0;
 ReceiveBuf = SBUF;
 /*
  do something;
 */
}