S32K146 Passive Filter Enable function

[kkw]

Hi:

    I used PTC15 as GPIO function, set input mode with pulldown register and enable  Passive Filter . Then connect 1 HZ, 1KHZ, 1MHZ, 30 MHZ, 50 MHZ square wave  to PTC15. But PTC 15 can detect high. 

   Will Passive Filter function filter high frenquency? Why PTC15 can detect high level? Is all GPIO has this fucntion? 

[Robin_Shen]

Hi kkw,

Please refer S32K146_IO_Signal_Description_Input_Multiplexing.xlsx that is attached to the S32K-RM.

In IO Signal Table, column U shows the reset state of PCR_PFE (bit 4) and column V specifies which pin has the PFE bit configurable.
Unfortunately PTC15 does not support this feature.

Best Regards,
Robin
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