Features: 1. SWD interface: support for simulation, download and debugging. 2. Mirco USB interface: power supply and USB communication, supports download. 3. USART1 interface: USART1 can use to program, or use the USART1 for communication. 4. MCU pin interface: Leads all I / O port pins, easy to connect to peripherals. 5. 5V and 3.3V power and output interface: widely used in external power supply, or with other common ground handling module. 6. Power LED PWR: Status indicator, can determine if power supply is stable. 7. the user LED PC13: facilitate the I / O output test or run the program. 8. Start jump choose programming mode: 1, user flash memory 2, SRAM 3, system memory. 9. Reset button: reset chip for user program. 10. 8 M Crystal: Can set the frequency to clock the system at 72 MHz. 11. 32,768 KHz Crystal: Available for built-in RTC, or for calibration. Functions: 1. the board based on the most basic MCU circuit, 8M and 32768 crystal circuit, USB power circuit. 2. the core board is divided into two rows leading to all I / O ports. 3. with SWD simulation debug download interface, simple and convenient, debugging speed. 4. using the Mirco USB interface, you can USB communication and power supply, USB interface, compatible with the ordinary Andrews mobile phone charger interface. Package List: 1 x STM32F103C8T6 Minimum System Development Board Module