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?
Hi,
The reset pin oscillating is normal behavior for unprogrammed Kinetis product.
Please check below thread for the reason:
Problem with pin reset on MCU MKL25Z128VLK4.
Re: Problem to program KL05Z - reset_b oscillation
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
Dear. Hui_Ma
Thanks for your answer.
i Will try to program use the j-link tool.
best regard.
sun man Kim.