S32K146 Passive Filter Enable function

kkw — Fri, 23 Oct 2020 04:04:14 GMT

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?

Re: S32K146 Passive Filter Enable function

Robin_Shen — Fri, 23 Oct 2020 07:46:23 GMT

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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topic Re: S32K146 Passive Filter Enable function in S32K

S32K146 Passive Filter Enable function

Re: S32K146 Passive Filter Enable function