MKL28Z7 GPIO digital filter function

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MKL28Z7 GPIO digital filter function

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liangliangma
Contributor II

Hi,

I read from the MKL28Z7 user manual that there is a digital filter function for the digital input pins, but I can not find the list of the pins that has this function. I tried on all the ports, seems the DFER, DFCR, DFWR registers of all the ports are read only. So where I can find more information about this digital filter function?

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi Liangliang,

Please download the MKL28ZRM, then read the chapter "3.11.1.1 Port control and interrupt summary".

Ports summary.png

Best Regards,

Robin

 

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi Liangliang,

Please download the MKL28ZRM, then read the chapter "3.11.1.1 Port control and interrupt summary".

Ports summary.png

Best Regards,

Robin

 

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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liangliangma
Contributor II

So there is no digital glitch filter on MKL28Z7, what a shame. Thanks for your reply anyway.

How about the passive input filter on PTA4 and PTB19, I cannot find specific document anywhere. I guess it is comprised by the pin internal pull up register (20kΩ~50kΩ), and 25pF pin load for normal/low drive pins, right?

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi Liangliang,

You can find analog/passive filter specifications in DataSheet(MKL28Z512VXX7):

analog filter.png

PTA4 PTA20 PTB19 analog passive filter.png

Best Regards,

Robin

 

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