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2812串口接收数据老是进入break中断是为什么?

两个2812芯片用线连接后进行收发,A发B收,波特率都是115200,奇校验,8数据位,1停止位。在B收的时候,前一段都是数据00,大概过一会就直接收不到数据,查询接收状态寄存器时,break中断标志位置1.想不明白为什么,求大神解读~~~~~~谢谢~~