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Features: 1. Using STM32F103R8T6 as main control IC (64 pins) 2. Pin-out all pins and mark its function 3. Supports JTAG£¬ SWD debug mode 4. Leads USART1£¬ you can use the serial download 5. RTC part may choose to use battery power£¬ or the power supply system 6. Use a jumper to select whether to use the USB interface£¬ convenient USB Development Program 7. PBO pins£¬ connected a green LED light£¬ convenient to debug. The board pre-burn the test program£¬ green LED will flash evenly when power on£¬ and send data constantly to serial port; Baud rate: 115200; Convenient to detect whether the module work normally User Manual: http://m5.img.dxcdn.com/CDDriver/CD/sku.316848.zip