STM32F429 IWDG freeze in stop mode

YKuo.1 · ‎2023-01-18

Hi,

I'm wondering if it's possible to freeze the IWDG in stop mode for STM32F429. I couldn't find this option in the STM32CubeProgrammer. Not sure if this is feasible.

Thanks,

FBL · ‎2023-01-19

Hello @Community member,

First, to get the product's option bytes you may refer to the RM0090 section 3.7.1 Description of user option bytes Table 16. It is clear that this product doesn't support IWDG option bit.

Second, to start the independent watchdog, you should program the control bits by writing to its Key register or by hardware option. Once started it cannot be stopped except by a Reset.

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

FBL · ‎2023-01-19

Hello @Community member,

First, to get the product's option bytes you may refer to the RM0090 section 3.7.1 Description of user option bytes Table 16. It is clear that this product doesn't support IWDG option bit.

Second, to start the independent watchdog, you should program the control bits by writing to its Key register or by hardware option. Once started it cannot be stopped except by a Reset.

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

YKuo.1 · ‎2023-01-19

Got it, Thanks for your prompt response.