STM32F745 - Disable Watchdog in Sleep mode

[LJain.1]

Hello,

I am using STM32F745VEHx. I would like to disable the software independent watchdog before microcontroller goes into Sleep low power mode and then re-enable it once microcontroller comes out of Sleep. I can find literature which suggests this can be done for Standby using the option bytes but I cant find a way to do this for Sleep.

My question is, can this be done for Sleep? If yes, can you please explain the process of doing it?

Thanks,

Lakeri

[Diane POMABIA]

Hi @[LJain.1] 

Independent watchdog is disable by default in all power mode but can be enable by software in all power mode.

You can find these information in Reference Manual RM0385 chapter 4 (Power controller).

If IWDG has been enabled, in sleep mode it will always work.

To enabled IWDG, you have to write 0x0000 CCCC in the IWDG Key Register(IWDG_KR).you can find more details about configuration of IWDG in reference Manual RM0385 chapter 27( Independent Watchdog)

This is the link to download Reference Manual:

https://www.st.com/resource/en/reference_manual/rm0385-stm32f75xxx-and-stm32f74xxx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

Regards

Dianep