- All IO port leads (with silk screen, to facilitate the external module)
- Serial port alone leads, there are multiple groups of 3.3V / 5V power supply, easy to external function module power supply.
- A user LED
- A reset button
- Serial download BOOT selection
- SWD mode download interface (through JLINK can download, store debugging KEIL version 5.0)
- A power LED
June 2, 2017