On-board STM32F103RBT6 chip
On-board JTAG interface and reset bottom
On-board 32.768 KHZ and 8 MHZ crystal vibration
Support 5V switchable 3.3V chip AMS1117-3.3
With a group of RS232 serial port， UART1 and UART2 can through jumper settings
All IO port are educed， and mark the I / O name
Support USB and Jlink power supply