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YKuo.1
YKuo.1
Associate II
January 19, 2023
Solved

STM32F429 IWDG freeze in stop mode

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,

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FBLBest answer
ST Technical Moderator
January 19, 2023

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 "Best answer" on the reply which solved your issue or answered your question.Best regards,FBL
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2 replies

FBLBest answer
ST Technical Moderator
January 19, 2023

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 "Best answer" on the reply which solved your issue or answered your question.Best regards,FBL
YKuo.1
YKuo.1Author
Associate II
January 19, 2023

Got it, Thanks for your prompt response.

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