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MKL25Z128VFT4 Reset pin is toggling

Question asked by David Tu on Mar 8, 2016
Latest reply on Dec 14, 2016 by Jianwu Tong

I have problem to program MKL25Z128VFT4 MCU. The design isn't change at all. However until recent purchase new MKL25Z128VFT. I have program issue with SWD interface. The reset pin always toggling.

The IO level 1.8 V is expected. However due to the toggling. it never reaches to 1.8v that cause me cannot program the chip.

The capture is from reset pin.

IMG_20160308_141112.jpg

 

Here is schematic:

MCU.jpg

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