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