STM32F103C8T6 ARM STM32 Minimum System Development Board -- the SWD port

September 17, 2016

The four pin header has: 

Gnd
Dclk
Dio
3.3
Apparently this is an SWD port. This is sort of a poor-man's JTAG. It can be used to program the chip, even replacing the boot loader. You could power the board from 3.3 volts using this header, but that would be kind of a backwards "hill-billy" approach.
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Tom's Computer Info / [email protected]