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1.通过单片机内部比较器的边沿跳变进入中断读取TAR的值
2.通过定时器进行比较器的输出的捕获得到的TAR的值
1与2对比，哪个比较精确，误差会多大，如果在8M MCLK的情况下跑。
没有明白楼主的意思。。。
1、主频越高越好
2、capture+DMA最好。
3、中断次之
