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Issamos
Lead III
October 28, 2025
Solved

B3 on the NUCLEO-C092RC is not mentioned on the UM3353

  • October 28, 2025
  • 2 replies
  • 148 views

Hello ST Community team,

on the MB2046 schematic, there is a button called B3 or Boot mode pin:

Issamos_0-1761645530483.png

But the UM3353 (chapter 7.9) mention only B1 and B2:

Issamos_1-1761645637407.png

Could you please correct this on the coming doc revisions.

Best Regards.

II

Best answer by Imen.D

Hello @Issamos 

Thank you for having reported this.

You are right ! The function for B3 Boot mode is missing description in UM3353.

An internal ticket ID 220601 is submitted in order to correct this.
(PS: Ticket ID 220601 is an internal tracking number and is not accessible or usable by customers).

2 replies

Imen.DBest answer
Technical Moderator
October 28, 2025

Hello @Issamos 

Thank you for having reported this.

You are right ! The function for B3 Boot mode is missing description in UM3353.

An internal ticket ID 220601 is submitted in order to correct this.
(PS: Ticket ID 220601 is an internal tracking number and is not accessible or usable by customers).

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
Technical Moderator
December 16, 2025

Hi @Issamos 

The UM3353 is now updated and published with correction.

Thank you for your contributions.

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"