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85问答库 > stm32中捕获上升沿或者下降沿，可以用外部中断，也可以用定时器捕获，二者有什么区别呢

stm32中捕获上升沿或者下降沿，可以用外部中断，也可以用定时器捕获，二者有什么区别呢

2025-03-21 10:12:54

推荐回答（1个）

回答1：

你要搞清楚一个概念，输入捕获的中断和counter的溢出中断是两种类型的中断，当counter溢出时，如果使能了溢出中断，则会触发溢出中断，不会触发通道的捕获中断，通道的捕获中断只有当该通道有信号触发（比如上升沿，下降沿，或相应电平）时才会产生中断标志置位，中断发生。

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