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想通过3200的板子读出一段时间内脉冲的个数，我看了一些interrupt和timer的内容，感觉还是不太理解怎么才能让板子将高低电平区分开并计数，求指点
Input Edge-Count Mode这个功能估计可以实现你的想法
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http://www.ti.com.cn/cn/lit/ug/swru367c/swru367c.pdf
9.4.2
