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Renesas RA0E1 Series of Microcontrollers (MCUs)

Entry level ultra-low-power format delivering up to 32 MHz of CPU performance

The Renesas RA0E1 group is a basic, simple MCU in the entry line of the RA0 series, offering excellent cost effectiveness and ultra-low power consumption. It delivers up to 32MHz of CPU performance using an Arm Cortex-M23 core with up to 64KB of embedded flash memory and a wide supply voltage range from 1.6V to 5.5V.

The RA0 series is ideal for cost-sensitive applications such as low power and lower cost for consumer electronics, system control for small appliances, industrial system control and building automation.

The MCU integrates multiple series of software and pin-compatible Arm®-based 32-bit cores that share a common set of Renesas peripherals to facilitate design scalability. The MCU in this series incorporates an energy-efficient Arm Cortex®-M23 32-bit core, that is particularly well suited for cost-sensitive and low-power applications, with the following features:

  • Up to 64-KB code Flash memory
  • 12-KB SRAM
  • Serial interface (SAU, UARTA, IICA)
  • General purpose timer (TAU, TML32)
  • 12-bit A/D converter (ADC12)


  • 32 MHz Arm Cortex-M23 core
  • 1KB data Flash memory (100,000 program / erase (P/E) cycles)
  • 16-pin and 32-pin package options
  • Wide voltage range of 1.6V to 5.5V
  • TAU (16-bit general PWM timer)
  • TML32 (32-bit interval timers)
  • RTC
  • Temperature sensor
  • SAU (UART, Simple SPI, Simple I2C)
  • UART
  • I2C bus
  • Random number generator
  • Safety functions
  • +-1% high accuracy high-speed on-chip oscillator
  • Flexible power architecture with fast wake-up
  • Best-in class HAL driver code
  • Supports Arm ecosystem and Renesas original development tools



  • Household water pump
  • Bathroom odor detector
  • Access control with body temperature measurement
  • HVAC environment monitor module for public buildings
  • General purpose systems
  • IoT devices
  • Industrial automation and sensors
  • Consumer applications
  • Home appliances
  • Building automation
  • Medical & healthcare devices
  • Wearable devices


For more information on the
Renesas RA Series Microcontrollers


Renesas — RA0E1 Series of Microcontrollers (MCUs)


RA0E1 Block Diagram

RA0E1 Block Diagram


RA0E1 Fast Prototyping Board

The RA0E1 Fast Prototyping Board is equipped with an RA0E1 MCU, making it an evaluation board specialized for prototype development for a variety of applications.

RA0E1 Fast Prototyping Board
FPB-RA0E1 Fast Prototyping Board

Key Features

  • Equipped with an RA0E1 32-bit MCU 32-pin ROM: 64KB, RAM: 12KB
  • No additional tools are required for program debugging/writing with the built-in SEGGER J-Link™ emulator circuit
  • Through-holes with access to all of the pins of the MCU
  • Arduino Uno™ and Pmod™ interfaces
  • Small size board: 53mm x 85mm
  • Support for various RA0E1 software and tools


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