GPIO口的外部输入阻抗。

[enxiguan]

我是用MCU的eTImer模块测量一个10V的PWM的周期和占空比，使用一个300K和100K的电阻进行分压，但是MCU无法有效的采集到PWM，将上面的电阻换成50K和100K就可以，请问这是什么原因？

[xiangjun_rong]

Hi, Enxi,

I suppose that the eTimer is peripheral of MPC56xx family, you use MPC56xx family, pls post your question to MPC community:

https://community.nxp.com/community/s32/mpc5xxx 

BR

Xiangjun Rong