STM32F103x8 STM32F103xB Medium-density performance.
STMicroelectronics
STM32F103CBT6 - ARM-based 32-bit MCU
STM32F103x8 STM32F103xB Medium-density performance line ARM®-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 com. interfaces D.