STM32G0 Lsecss issue

[oziesin]

Hi all,

I enabled LSECSSON register after select rtc clock as said from RM.

I did not have any problem but if i shutdown power and power on , device used LSI as a rtc source and it cannot start LSE. Why this is happening ?

[Imen.D]

Hello @oziesin​ ,

Which pin of the chip are you using to start from shutdown mode ?

Imen

[oziesin]

Manually, I plug off of energy pin and plug in again.

[Imen.D]

Hi @oziesin​ ,

Make sure you are well powering OFF the device.

As you know at power ON, device start from default configuration (all status/config bits at their default status), and so behaviour at each power-on should be always the same. 

When you switch poweron -> poweroff, I would suggest to check that VDD goes to ‘0’ and stay enough time w/o power.

Imen