Kinetis MicrocontrollersのトピックRe: MKE04Z8 continuously restarts

MKE04Z8 continuously restarts

jankowalski — Tue, 22 Sep 2015 10:37:57 GMT

Hi,

I have recently build some solution based on MKE04Z8 (TSSOP16). Unfortunately it doesn't work correctly. I can program it with no error but after program uC continously restarts even if I insert only for loop which increments simple variable.

P.S I work on internal clock with FLL (at the moment not configured).

Re: MKE04Z8 continuously restarts

mjbcswitzerland — Tue, 22 Sep 2015 14:30:21 GMT

Hello Jan

Check the reset status register after the processor restarts in order to see the reason for it.

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html

KE: http://www.utasker.com/kinetis/FRDM-KE02Z.html / http://www.utasker.com/kinetis/FRDM-KE02Z40M.html / http://www.utasker.com/kinetis/FRDM-KE04Z.html / http://www.utasker.com/kinetis/FRDM-KE06Z.html

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: MKE04Z8 continuously restarts

david_diaz — Mon, 19 Oct 2015 22:05:19 GMT

Hello Jan,

Any update about your issue?

You can refer to the System Reset Status and ID Register (SIM_SRSID) in order to know the cause of the Reset.

You can find more information at Chapter 12.2.1 from the reference manual at:

www.freescale.com/files/microcontrollers/doc/ref_manual/MKE04P24M48SF0RM.pdf

I hope this information will be useful for you.

Have a great day.

David

Re: MKE04Z8 continuously restarts

briancavanagh — Mon, 20 Feb 2017 20:48:36 GMT

Hi David, I ordered a few PCB's and soldered on the MKE04Z8VTG4 and was experiencing resets on Pin 1.

At first I was thinking it was something within my circuits on the board. What I did to confirm this was remove all components connect to the MKE04Z8VTG4 with the exception of:

1. Decoupling cap between pins 3 and 4 (I'm providing 5Vdc)

2. RC circuit at Pin 1 (PTA5), R=10k and C=.1uF.

The signal appears as a "Sawtooth" at a frequency of 5.435kHz. The DC offset is 2.26Vdc with a ramp of 720mV, and then returns to 2.26Vdc, and then repeats. Can you assist me with this or direct me to someone who can?

Thank you,

Brian

Re: MKE04Z8 continuously restarts

mjbcswitzerland — Mon, 20 Feb 2017 21:04:57 GMT

Brian

This behavior is typical of a board that has no software loaded to it - although the frequency is more like 250Hz.

Faster reset cycling can be due to the watchdog being incorrectly initialised, leading to a faster reset cycle.

Remember that the watchdog is enabled by default and if it is not disabled/configured/re-triggered within 4ms it will reset, which pulls the RESET pin low. Then the input will ramp up again due to the R/C.

If the watchdog disable/configure routine does something wrong the watchdog will also fire (faster) and thus cause a faster saw tooth signal to be generated.

Regards

Mark

Professional support for Kinetis: http://www.utasker.com/index.html
Remote desktop one-on-one coaching: http://www.utasker.com/services.html
Getting started to expert videos: https://www.youtube.com/results?search_query=utasker+shorts