STM8S207R8T6的串口3不能实现接收中断，我用的是IAR库函数版本，内部16M晶振，编译没有问题，各位大神帮给我看看哪里出问题了，附件是我的工程文件



void main(void)
{
  UART_Init(); //初始化UART
  
  Send_Str("STM8S UART 实验！ ");//发送字符串
  enableInterrupts(); //开启中断

  while (1)
  {
   
  }
  
}
void UART_Init(void)
{
    UART3_DeInit();
    UART3_Init((u32)9600, UART3_WORDLENGTH_8D, UART3_STOPBITS_1, UART3_PARITY_NO, UART3_MODE_TXRX_ENABLE);
    UART3_ITConfig(UART3_IT_RXNE_OR, ENABLE);
    UART3_Cmd(ENABLE);
   
   enableInterrupts();
}
INTERRUPT_HANDLER(UART3_RX_IRQHandler, 21)
{
    /* In order to detect unexpected events during development,
       it is recommended to set a breakpoint on the following instruction.
    */
   //UART3_ClearITPendingBit(UART3_IT_RXNE);
   UART3_SendData8(UART3_ReceiveData8());
}