I try to make a custom board for the STM32F303K8T6 and I am not sure if I do it right. Actually the design is oriented on the STM32F3Discovery. I will not run time critical applications so that I don't need an external oscillator. To flash and debug, I want to use the SWD, but there I am not sure, if I really need the V3.3 pin? Is this PIN not to power the board with the SWD? So when I activate the voltage regulator when I flash, this should be redundant, right?