Product:STM32F103C8T6 small system board Working frequency:72 MHz RAM:64K flash program storage Byte:20J byte SRAM Supply voltage:DC3.3~ 5V Reset:Power on/off reset Functional model:Sleep,standy,and shutdown modes STM32F1 03C8T6 Package Type: LQFP Number of pins: 48 Kernel: Cortex-M3 Operating frequency: 72MHz Storage resources: 64K Byte Flash, 20KByte SRAM Interface Resources: 2x SPI, 3x USART, 2x I2C, 1x CAN, 37x 1/ 0 ports, Analog-to-digital conversion: 2x ADC (12-bit/16-channel) Timers: 3 general timers and 1 advanced timer. Debug Download: Support JTAG I SWD debug interface to download, support for IAP.2 RT9193: 3.3V regulator chip, the maximum output of 300mA. SWD interface: support for simulation, download and debug. Mirco USB interface: power supply and USB communication, does not support the download. USART1 interface: USART1 can be used to download the program, or use the USART1 for communication. MCU pin interface: leads all I/ 0 port pins, easy to connect with peripherals. 5V and 3.3V power input and output interface: commonly used in externalm power supply, or with other modules for common ground treatment