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关于C6657 SPI中断



最近在学习论坛里C6657的SPI例程,有几点不懂(下图),希望能得到解答,谢谢!

1.代码中三次写入SPIDAT0为何能触发接收溢出中断?

2.三次写入数据后延时有何作用?

3.接收满中断与接收溢出中断区别是什么?如何产生接收满中断?