BIG PROBLEM! K22FX512 continue to reset

[ypkdani]

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

[ypkdani]

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

1. run command "r0" to set reset pin to 0
2. give "unlock kinetis"
3. give "erase MK22FXAXXX12"

monday i will try with other board

[jorge_a_vazquez]

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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[Lily_cheng]

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?