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How to set up clock for crystal-less USB on MK20DX128VFM5 ?

Question asked by Andrew Lentvorski on Nov 15, 2014
Latest reply on Nov 16, 2014 by Andrew Lentvorski

I've been trying to create a non-OS (barebones) crystal-less USB CDC echo example for the K20 series.  None of the pre-made demo projects seem to do that (if there is one that I missed--please ship me a pointer as it will save me a lot of grief).

 

I can't seem to find the right magic combination of system clock and USB clock configuration options in order to make Processor Expert in the Kinetis Design Studio happy.

 

Does anybody have some pointers or suggestions?

 

Thanks.

 

Keywords: crystal-less crystalless MK20DX128

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