Check the listing for details. USA STM32F103C8T6 ARM STM32 Minimum System Development Board Module 2/4/6Pcs. Condition: New. Listed at 10.45 USD. Package Type: LQFP; Number of pins: 48; Kernel: Cortex-M3; Operating frequency: 72MHz; Storage resources: 64K Byte Flash, 20K Byte SRAM; Interface Resources: 2x SPI, 2x USART, 2x I2C, 1x CAN, 37x I / O ports, Analog-to-digital conversion: 2x ADC (12-bit / 16-channel) Timers: 2 general timers and 1 advanced timer Debug Download: Support JTAG / SWD debug interface to download, support for IAP. 2, RT9193: 3.3V regulator chip, the maximum output of 300mA. Additional Features: 1, Power LED (PWR): Power indicator status, can determine whether the power supply is stable. 2, the user LED (PC13): to facilitate the I / O output test or indicate the program running. 3, start jumping choose programming mode: (1, the user flash memory 2, SRAM 3, system memory). 4, reset button: reset chip for the user program. 5, 8M Crystal: The frequency can be set to make the system clocked at 72MHz. 6,32.768KHz Crystal: Available for built-in RTC, or for calibration Package Included: 2/4/6pcs Board Module On Feb 20, 2023 at 23:47:12 PST, seller added the following information: