STM32L431 LPTIM2 mode Stop 2

[Mich1]

In the datasheet page 25, it is indicated that in mode stop 2 LPTIM2 is frozen. But in STM32CubeMx Version 5.2.0 we can see that LPTIM2 Clock mux can choose LSE so the timer is not frozen. Is there an error in the datasheet?

[Nesrine.JLASSI]

Hi @Community member​ 

I redid the same scenario, you can't choose LSE in the LPTIM2 Clock .

Best regards,

Nesrine

[After Forever]

Nesrine

> I redid the same scenario, you can't choose LSE in the LPTIM2 Clock .

Have you enabled the LSE in RCC settings? I redid the scenario too, and I can choose LSE as LPTIM2 Clock.

Mich

> Is there an error in the datasheet?

I think there is no contradiction, you can clock LPTIM2 from LSE, but LPTIM2 isn't active in stop mode 2, even if LSE is active.

[Mich1]

How should I understand first line at page 142 of the reference manual? Stop 2 => 2 columns (dash and Wakeup capability) what is the meaning of dash?

LPTIM2 is optional in stop mode 2 for Wakeup capability but not for dash column for the STM32L431. How do I undestand that?