topic BIG PROBLEM! K22FX512 continue to reset in Kinetis Microcontrollers

BIG PROBLEM! K22FX512 continue to reset

ypkdani — Fri, 31 Mar 2017 14:11:05 GMT

Hello,

i have develop a new embedded board with the MK22FX512VLL12. I have put a pull-up of 10kohm on the reset pin but when i try to program this micro for the first time the reset pin continue to oscillate.

i have try with the segger commander with the command erase and unlock kinetis but nothing. I can't erase the memory. I have read some post that speak about this problem but i didn't find a solution. I use a EDU Segger Jlink.

This happen on all board

Thanks

Re: BIG PROBLEM! K22FX512 continue to reset

ypkdani — Fri, 31 Mar 2017 18:16:12 GMT

Ok, for two board i have solve using jlink commander:

run command "r0" to set reset pin to 0
give "unlock kinetis"
give "erase MK22FXAXXX12"

monday i will try with other board

Re: BIG PROBLEM! K22FX512 continue to reset

jorge_a_vazquez — Tue, 25 Apr 2017 01:32:02 GMT

Hi Daniel Cortellazzi

Actually this is not a problem, it is telling you that there is anything in the flash memory, so when your device try to fetch a instruction from the internal flash and it doesn't find anything it cause a hard fault and it reset, when the process repeat, it reset again, and it stock in this loop.

If you flash a program in this devices the reset line should behave normal.

Have a great day,
Jorge Alcala

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Re: BIG PROBLEM! K22FX512 continue to reset

Lily_cheng — Thu, 29 May 2025 05:54:58 GMT

I had the same promblem.

after saveral reset K22FX512 continue to reset.
sometimes JLINK can't connect to K22FX512.

yes, you are right ,the data in flash has some error which cause this promblem, but the question is , why flash's data error after reset ?

I read data when sometimes connect success, the data goes to FF.

Could you explain why the data goes to FF after reset?