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Strage pulse from FTM

Question asked by Kiyoshi Matsuzaki on Jul 29, 2016
Latest reply on Aug 2, 2016 by xiangjun.rong

Hi, all.

 

I created our original board with Kinetis K64F, then I build software using KSDK1.2.

This softwave generated clock pulse from FTM0 and the frequency is changed every 20msec.

I checked wave form and I got some strange pulses.(please see atached image)

The pulse at the left side is correct. The smaller pulse at the center is incorrect.

There are two strange points about the pulse at the center.

1.

Software didn't set this frequency.

2.

Eventhough the software set this frequency, I think pulse has to be 3.3V, but this strange pulse is 1.6V.

 

I would like a reason of this strange pulse.

If you have any advises, suggestions, etc, please let me know.

 

Best regards,

 

Kiyoshi Matsuzaki

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