Is this correct about the RTC and the sub second counter

[MSipo]

I'm using an STM32L051.

Is this how the sub second counter works in the RTC? The sub second counter always starts at PREDIV_S when a new second starts?

The graph shows a simplified example when PREDIV_S is 3.

[waclawek.jan]

Which STM32?

> Is this how the sub second counter works in the RTC?

Yes. However, note, that reading it out properly may be tricky.

JW

[MSipo]

I'm using an STM32L051.