RA2E2 Fast Prototype Board Renesas Electronics RA2E2 Fast Prototype Board is an ultra-low-cost evaluation and development platform for the RA2E2 32-Bit Microcontrollers. The RA2E2 MCUs are based on the 48MHz Arm® Cortex®-M23 core with innovative on-chip peripheral functions. The devices offer ultra-low power operation and high-speed serial communication with compact 20-pin and 24-pin QFN and 16-pin CSP packages, satisfying the needs of cost-sensitive and space-constrained applications.