stm32 Dynamic Efficiency MCU, High-performance and DSP with FPU, ARM Cortex-M4 MCU with 512 Kbytes Flash, 100 MHz CPU, Art Accelerator stm32 Dynamic Efficiency MCU, High-performance and DSP with FPU, ARM Cortex-M4 MCU with 256 Kbytes Flash, 100 MHz CPU, Art Accelerator