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M4关于定时器测频



我用的两个定时器测频,为什么当频率在80HZ到500HZ的范围内会出错,其他频段内结果还不错,用的是TI官方的测频模块,算法也是用的TI提供的,但出现这种结果,希望知道的告诉下,谢谢