The STM32F301C6T7 is a 32-bit ARM Cortex-M4 MCU from ST's STM32F3 series, clocked at 72 MHz with a single-cycle multiply-and-accumulate and a hardware FPU. That FPU is the reason to pick this part over an M3 or M0+ at the same speed — it handles floating-point PID coefficients or sensor fusion trig without a software library eating cycles.
Industrial temperature range and on-chip peripherals
Internal oscillator saves a crystal for UART and I²C. On-chip DMA, I²S, POR, PWM, WDT. Supply range is 2 V to 3.6 V.