topic Re: MKL28Z7 GPIO digital filter function in Kinetis Microcontrollers

MKL28Z7 GPIO digital filter function

liangliangma — Wed, 04 Jan 2017 03:41:59 GMT

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?

Re: MKL28Z7 GPIO digital filter function

Robin_Shen — Thu, 05 Jan 2017 01:27:46 GMT

Hi Liangliang,

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

Best Regards,

Robin

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

Re: MKL28Z7 GPIO digital filter function

liangliangma — Fri, 06 Jan 2017 02:50:16 GMT

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?

Re: MKL28Z7 GPIO digital filter function

Robin_Shen — Mon, 09 Jan 2017 09:01:20 GMT

Hi Liangliang,

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

Best Regards,

Robin