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The STM32F103xx medium-density performance line family is built around the high-performance ARM Cortex-M3 32-bit RISC core, operating at a frequency of 72 MHz. It features fast embedded memory with up to 128 Kbytes of Flash and 20 Kbytes of SRAM, as well as a wide range of enhanced I/Os and peripherals connected to two APB buses. Each device includes two 12-bit ADCs, three general-purpose 16-bit timers (plus one PWM timer), and a variety of communication interfaces, such as up to two I2C and SPI interfaces, three USARTs, one USB, and one CAN.

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