This document is a translated version of the STM32F102x8B datasheet released in April 2009. It describes the features and characteristics of the STM32F102x8 and STM32F102xB medium-density USB basic type microcontrollers, including the ARM Cortex-M3 CPU, memory, clock, reset and power management, low power modes, debug modes, DMA controller, ADC, fast I/O ports, timers, communication interfaces, CRC calculation unit, etc.