485接收数据是外部中断还是内部中断

Widow · 发表于 2017-5-3 15:21:15

      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART2连了MAX485模块，这样的话接收到数据产生中断是外部中断还是内部中断？
      外部中断和内部中断有什么区别？
      谢大神指教