The STM32F100xx value line family incorporates the high-performance ARM Cortex?-M3 32-bit RISC core operating at a 24 MHz frequency，high-speed embedded memories (Flash memory up to 128 Kbytes and SRAM up to 8 Kbytes)， and an extensive range of enhanced peripherals and I/Os connected to two APB buses。 All devices offer standard communication interfaces (up to two I2Cs, two SPIs，one HDMI CEC, and up to three USARTs)， one 12-bit ADC, two 12-bit DACs， up to six general-purpose 16-bit timers and an advanced-control PWM timer。The STM32F100xx low- and medium-density value line family operates in the –40 to +85 °C and –40 to +105 °C temperature ranges，from a 2.0 to 3.6 V power supply。 A comprehensive set of power-saving mode allows the design of low-power applications。The STM32F100xx value line family includes devices in three different packages ranging from 48 pins to 100 pins。