topic Re: S32k148 RTC Initialization is not consistent between power cycles in S32K

S32k148 RTC Initialization is not consistent between power cycles

Pratap_Metharamitta — Tue, 01 Apr 2025 22:21:02 GMT

Hello NXP team,

We have issue with S32k148 RTC Initialization, it is not consistent between power cycles, what we are initially setting is:

But sometimes we are seeing this:

On the same device randomly after some power cycles.

Any suggestions will be appreciated.

Regards, Pratap

Senlent — Wed, 02 Apr 2025 07:33:22 GMT

Hi@Pratap_Metharamitta

I think the Power Cycle you mentioned refers to switching between RUN mode and low power mode.

For example, if it is RUN mode and VLPS mode, you can check the clock configuration of the RTC.

Usually there are two different clock configurations corresponding to RUN mode and VLPS mode respectively.

When you enter VLPS, the clock in VLPS mode will be switched.

When your MCU wakes up from VLPS mode, you need to switch your clock to RUN mode again

（so, I don't know whether you have re-initialized the clock configuration in RUN mode after waking up.）.

These are some of my guesses. You can check whether it may be caused by this problem.

Pratap_Metharamitta — Wed, 02 Apr 2025 15:25:06 GMT

The Power Cycle I have mentioned refers to switching between ARM RESET Mode, RUN Mode, Low Power Mode and No Power (VDD to 0V) Mode.

Senlent — Thu, 03 Apr 2025 03:03:12 GMT

Could you please share the project, i will take some time to help you double check it.