Which is the BOOT1 pin in STM32L0? Don't find in the pin description.

[FBIZA.1]

According to the ST boot mode selection (page 236), we can activate the bootloader following the pattern: Boot0(pin) = 1 and Boot1(pin) = 0; but the DatasheetSTM32L0 doesn’t specify which one is the BOOT1 pin in the pin description (page 33). I could only find the BOOT0 pin.

[Uwe Bonnes]

Boot1 is some Option Bit.

[FBIZA.1]

Could you explain what you mean?

(just to make sure, did you mean optional?)

Thanks in advance!

[berendi]

It looks like an error in AN2606.

Option bits are non-volatile configuration bits that control booting and security features. Read about them in chapters 2 and 3 of the reference manual.

[FBIZA.1]

Which reference manual? could you please send me the link, I can't find the information.

Thanks in advance!

[berendi]

https://lmgtfy.com/?q=stm32l051+reference+manual

[Mohamed Aymen HZAMI · Accepted solution]

Hello,

You can modify the BOOT1 state by using the option bytes.

1. connect your device to the Cubeprogrammer
2. select the option byte button "OB" like this :

then you can modify BOOT0 and BOOT1 according to your needs.

Best Regards,

Mohamed Aymen.

[FBIZA.1]

Thanks a lot for your clarifying answer!