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我在用官方的捕获模块例程eCAP Capture PWM Example进行脉冲捕获时。eCAP模块的输入为信号发生器。但在测试时发现当输入信号的频率在1.8KHz时,根据capxCount变量计算的周期和占空比是错误的。因为想咨询一下问题可能的原因,或者eCAP模块对于低频信号有什么额外需要设置的吗?