LSE enable for STM32WLE5CCU6

[OTudo.1]

Hi,

I am trying to activate LSE in a project with STM32WLE5CCU6, the pins PC14 and PC15 are activated, but in the window with clock tree, the RTC clock mux does not alow me to select LSE (it is locked on LSI). This happens even if all other pins are unused. I am using CubeMX version 6.3.0.

Does anybody encounter this problem? I am doing something wrong? Can anyone check?

Thank you

[TDK]

You need to enable the LSE in System Core -> RCC first, then you can select it as a clock source.

[OTudo.1]

Thank you for answering,

That is exactly how I set it up, I selected Crystal for LSE clock, but in Clock configuration page RTC Clock Mux is still locked.

I had attached the ioc file.

[Mike_ST · Accepted solution]

Hello,

Please activate the RTC in the Timers section, and select, "activate clock source".

[OTudo.1]

Thank you,

Now I understand how to activate it.