topic Strange waveform measurement of Reset pin in Kinetis Microcontrollers

Strange waveform measurement of Reset pin

sunmankim — Tue, 16 Dec 2014 00:59:47 GMT

I was making a sample board using the MK64FN1M0VLQ12

Apply the power and confirmed the clock and reset.

But this strange wave was measured at reset pin. like as below,

My sample board have a 10K ohm pull up resistor.

Regardless of the existence of the pull-up resistor, this waveform is

always measured, Like the attached picture.

It seems like a reset pin directly drives High-Low as the output pin.

So I am the SWD debugging using the J-Link Tool Fail to proceed.

Is there a way to fix this problem?

Hui_Ma — Wed, 17 Dec 2014 06:01:07 GMT

Hi,

The reset pin oscillating is normal behavior for unprogrammed Kinetis product.

Please check below thread for the reason:

Customer can use J-Link tool to program the K64 flash memory, then the reset pin oscillating behavior should be fixed.

Wish it helps.

Best regards,

Ma Hui

sunmankim — Fri, 19 Dec 2014 01:29:45 GMT

Dear. Hui_Ma

Thanks for your answer.

i Will try to program use the j-link tool.

best regard.

sun man Kim.