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Bassett.David
Bassett.David
Associate III
May 25, 2021
Solved

Factory default value of FLASH_OPTR

  • May 25, 2021
  • 2 replies
  • 2730 views

Hello,

I would like to know the behavior of the BOOT0 pin on a factory fresh STM32G474 device. I'm wondering if I can use PB6 as a general input without causing side effects if the flash option register is at factory defaults. The reference manual shows: "Reset value: 0xFXXX XXXX", but what are the *** *** values as shipped from the factory?

Thank you for any insight you can provide - much appreciated!

Regards,

Dave

    This topic has been closed for replies.
    Best answer by Igor Cesko

    Hi Bassett.David,

    This register is loaded from option bytes. The "ST production value" for option bytes is written in reference manual RM0440 (chapter FLASH option bytes). For FLASH_OPTR (and STM32G474 device) is the ST production value: 0xFFEF F8AA .

    Regards

    Igor

    2 replies

    Igor Cesko
    Igor CeskoBest answer
    ST Employee
    May 26, 2021

    Hi Bassett.David,

    This register is loaded from option bytes. The "ST production value" for option bytes is written in reference manual RM0440 (chapter FLASH option bytes). For FLASH_OPTR (and STM32G474 device) is the ST production value: 0xFFEF F8AA .

    Regards

    Igor

    Bassett.David
    Bassett.DavidAuthor
    Associate III
    May 26, 2021

    Hello Igor,

    Thank you very much! I apologize for missing it. (In RM0440 Rev. 6, I was looking at page 138, but the information I needed was on page 110).

    Regards,

    Dave

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