How to store data on reset

[lazaro]

I'm using an MXRT1062 micro, after a certain number of restarts the watchdog is going off causing an error when the system is back on. I want to store the PC before the shutdown but don't have enough time to store it to flash. Is there anything on this chip I could use to store the PC before the reboot while the watchdog is going off?

[jingpan · Accepted solution]

Hi @lazaro ，

There is a 256-bit general-purpose register in SNVS. Maybe you can use it. Please refer to 20.3.3.2.1 in reference manual.

Regards,

Jing

[lazaro]

Is there an application note on how to use the SNVS?

[jingpan]

Hi,

Please refer to this link

https://community.nxp.com/t5/i-MX-RT/SNVS-general-purpose-registers/m-p/918327

If you haven't backup battery, there is no other way in this chip. You have to add a I2C eeprom or something like that.

Regards,

Jing