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关于AM3359的内部中断(time out)响应

Other Parts Discussed in Thread: AM3359

我做了一个time out的程序。(使用的是DMTimer3)
发现:

程序从发生time out开始,
到程序进入中断函数为止。(也就是中断响应时间)

一共进行了8.96us,而我们原来使用的CPU只用了0.50us。

我想问一下,这什么AM3359的响应时间这么慢?