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Input capture module in MK22FN512VLH12 Microcontroller

Question asked by Prasanna Naik on Mar 14, 2019
Latest reply on Mar 20, 2019 by Alexis Andalon


   I want to measure frequency of a signal (Range: 20 to 70 Hz) with resolution of 0.005 Hz. I was trying to use capture mode of K22f but it is 16 bit capture module. One of my colleague experimented with 16 bit capture and was not able to get the desired resolution due to the problem mentioned in the thread below:

Error in frequency measurement using capture inputs of LPC11U68 

Please suggest a method to measure the input frequency with the desired accuracy using MK22FN512VLH12 microcontroller. Also, please share reference code if possible. I have FREEDOM KINETIS K22F board for evaluation.


Thanks in Advance!!!


Best Regards,