IC693PWR322LT/IC693PWR322CA

IC693PWR322LT/IC693PWR322CA

IC693PWR322LT/IC693PWR322CA

IC693PWR322LT/IC693PWR322CA

1. 捕获通道 1 触发 DMA，同时设置 捕获上升沿 ，这样，只要上升沿触发了，可以自动完成捕获并DMA传输至用户缓存。通道 2 下降沿捕获 ，不触发 DMA。

2. 配置DMA，传输外设地址不是某一个寄存器，而是 DMAR，同时设置传输数量，这是 2 的倍数，因为一次需要传输两次，32 位宽度。

3. 因为需要传输两次 CCRx，所以需要正确设置 DCR 寄存器。

以上配置就是整个功能为关键的部分。如果你理解了下面介绍的捕获原理，你自然知道为什么需要这么设置了。

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