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mkm
Explorer
August 21, 2023
Solved

PH3-BOOT0

Hi,

I am using STM32U585RIT6 MCU & I planned to flash the firmware through SWD and onboard debugger module (STLINK-V3MODS) through VCP.

I am having confusion in configuring the PH3-BOOT0 pin.

Should I connect it to 5V or GND.

Or shall I make it No connect.

@RomainR.  Can you pls help me on this?

Thanks in advance for any suggestions or help

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    Diane POMABIABest answer
    ST Employee
    August 21, 2023

    Hi @mkm 

    If you need to boot on the internal flash memory, this pin is set to level LOW (GND) by a pull‑down resistor.

    It is possible to put this GPIO to level HIGH to boot on the system flash memory (bootloader), by connecting  this pin to VDD.

    Regards

    Diane

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    1 reply

    Diane POMABIABest answer
    ST Employee
    August 21, 2023

    Hi @mkm 

    If you need to boot on the internal flash memory, this pin is set to level LOW (GND) by a pull‑down resistor.

    It is possible to put this GPIO to level HIGH to boot on the system flash memory (bootloader), by connecting  this pin to VDD.

    Regards

    Diane

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