CN5 JTAG Conn
--------------
JRST - o o - GND
JTDI - o o - JTMS/SWDIO
JTCK/SWCLK - o o - JTDO
o - +3v3
CN7 SWIM Conn
--------------
o - VDD - (V_target) - Unconnected/Floating if Jtag-PCB is broken away from STM8-Board
o - USART1_RX - (SWIM_IN)
STM8-Board <-- o - GND
o - USART1_TX - (SWIM_RST)
|
v
XTAL