Does STM32F042K6T6(LQF-32) microcontroller require boot pin to be grounded through resistor?

[SMula]

Hi,

I am working on STM32F042K6T6(LQF-32) ARM microcontroller with STM32CubeMX and Keil software, according to the datasheet boot0 pin is available in pin-31 but when I open the same controller in STM32CubeMX I am neither finding any such pin nor its function like BOOT0

So should I include 10k ohm resistor at pin-31 and ground it irrespective of its availability?

Can anyone help me out here?

Regards

Shivakumar

[Tesla DeLorean]

Yes, you should have a pull down to ensure consistent start up performance. ​

[SMula]

Thank you Clive!

Even though there is no BOOT0 function available in the pin-31(PB8) as attached in the image here, I should directly connect a pull down right?

Otherwise(if I do not use pull down) is there any chances of reading garbage data from stored flash data everytime when I restart the controller?

Regards

Shivakumar

[Ozone]

> Otherwise(if I do not use pull down) is there any chances of reading garbage data from stored flash data everytime when I restart the controller?

A floating BOOT pin will make your board startup into system mode (ROM bootloader) or other modes seemingly at random.

> Even though there is no BOOT0 function available in the pin-31(PB8) as attached in the image here, I should directly connect a pull down right?

BOOT0 is not "selectable functionality" - it is the pin's functionality at startup (POR), before you application. Check the datasheet.