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I have a doubt about the STM32F4XXX reference manual

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there is maybe a mistake at the page 99 in the RM0090 Reference manual document:

the bit area 12 is valid or not?

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TDKBest answer

Bits 31:13 should be marked as reserved, instead of 31:11.

It is correct in 3.9.1 but incorrect in 3.9.2.

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ST Technical Moderator

Hello @fang liang ,

Can you please describe clearly the issue with bit 12 ?

Why is that not valid ?

Imen

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Senior

I guess it's because the range 31:11 is declared Reserved, but just below you have bit 12 and 11 shown as readable and/or writable.

bits 12 and 11 are in the range 31:11.

Senior

Should the reserved bits be 31:13 or should bits 12 and 11 be reserved?

TDKBest answer

Bits 31:13 should be marked as reserved, instead of 31:11.

It is correct in 3.9.1 but incorrect in 3.9.2.

"If you feel a post has answered your question, please click ""Accept as Solution""."

fang liangAuthor

Associate II

thank you for all