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JTros.1
JTros.1
Visitor II
February 24, 2021
Solved

WWDG timeout: example calculation in RM incorrect?

  • February 24, 2021
  • 1 reply
  • 1061 views

In the STM32F4 Reference Manual, there is an example calculation of the WWDG timeout period t_WWDG (see attached image).

However when I type in the numbers from the example, I get a different value (87.38 ms instead of 21.85 ms). It seems that the value was calculated with WDGTB[1:0] set to 1 instead of 3.

Can someone confirm that this is correct?

This topic has been closed for replies.
Best answer by Imen.D

Hello @JTros.1​ and welcome to the STM32 Community :)

Thanks for pointing out this issue.

You are right, the correct value should be 87.38ms (not 21.85 ms) and the same error is also in the STM32F2 and STM32F1 reference manuals.

I’ve asked the appropriate team to fix this in the coming releases.

Please mark this answer as "Best Answer" by clicking on the "Select as Best" button, this can be very helpful for Community users to find this post more quickly.

Thanks for your contribution.

Imen

1 reply

I
Imen.DBest answer
ST Technical Moderator
March 1, 2021

Hello @JTros.1​ and welcome to the STM32 Community :)

Thanks for pointing out this issue.

You are right, the correct value should be 87.38ms (not 21.85 ms) and the same error is also in the STM32F2 and STM32F1 reference manuals.

I’ve asked the appropriate team to fix this in the coming releases.

Please mark this answer as "Best Answer" by clicking on the "Select as Best" button, this can be very helpful for Community users to find this post more quickly.

Thanks for your contribution.

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
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