Thank you, @maxter, your statement is correct and I must correct my statement above that external pull resistors are always necessary on SW. This is from the old days of the STM32F103 and its colleagues, where there were indeed often problems if the SW pins did not have a defined potential.
You would now have to check the reference manuals to see exactly when the internal pull resistors were introduced on the SW pins. For the STM32F030 (mentioned by the TO), your STM32G0B1 and similar devices from that family, a fixed potential on the SW pins is no longer necessary, which can be concluded from RM0360, section 8.3.1 and RM0444, section 7.3.1.
Thanks again!
Regards
/Peter
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