S32K344 resets every three days or RTC system clock returns to initial value every three days

[SCoder41]

(S32K344) I implemented a function where the RTC system clock was set to an initial value (2025-3-11 15:25:0), and then the current system time was obtained every 0.5 seconds and stored on the SD card. I tested continuously for 7 days, but after 7 days, I found that the logs in the SD card would return to the initial value of 2025-3-11 15:25:0 every time it reached [2025-3-13, 4:41:57]. Is it because the system reset or is it just an issue with RTC?

[Julián_AragónM · Accepted solution]

Hi @SCoder41,

Just from the log, I am unable to pinpoint if the issue is mainly the RTC or the MCU. Could you share the code (either here, or by a private message). If not, could you share exactly what the code does? 

Also, if the reset source is not a SW reset, (i.e. hardware reset), the counter value will be reset. You must configure either SIRC or SXOSC, and perform SW reset to avoid resetting the counter: Solved: Does the S32K312 RTC support system time keeping at reset? - NXP Community

Best regards,
Julián

[SCoder41]

I have sent you the code via private message.

[SCoder41]

My code size exceeds 25MB, is there any other way to send it to you?