STM32F103xF / STM32F103xG Performance Line MCUs STMicroelectronics STM32F103xF / STM32F103xG XL-density STM32 Performance Line microcontrollers incorporate the high-performance ARM Cortex™-M3 32-bit RISC core operating at 72MHz, high-speed embedded memories (Flash memory up to 1MB and SRAM up to 96KB), and an extensive range of enhanced I/Os and peripherals connected to two APB buses. All STM32F103xF / STM32F103xG Performance Line MCUs offer three 12-bit analog-to-digital converters, 10 general-purpose 16-bit timers plus two PWM timers, and standard and advanced communication interfaces (up to two I2Cs, three SPIs, two I2Ss, one SDIO, five USARTs, an USB and a CAN).