The R8C/3NT Group is supported only for the customers who have already adopted any of the products. For new adoption, please consider other products such as RX130 Group.

Main Solutions

Key Features:

  • CPU core: R8C 16-bit CPU core
  • Minimum instruction execution time:
    50 nsec (f(Xin) = 20 MHz)
  • Supply voltage:
    2.7 to 5.5 V/Max. 20 MHz, 1.8 to 5.5 V/Max. 5 MHz
  • ROM/RAM:
    48 KB/4 KB, 64 KB/6 KB, 96 KB/8 KB, 128 KB/10 KB
    (RAM: 0.5 KB for touch detection)
  • Data flash: 1 KB x 4 blocks (Touch setting values can be stored.), with background operation (BGO) function*1
  • DTC (Data transfer controller): 1 ch
  • Clock generation circuits: 4 circuits
    - XIN-XOUT main clock (oscillation stop detection circuit included)
    - XCIN-XCOUT sub clock
    - High-speed on-chip oscillator (40 MHz Typ.)
    - Low-speed on-chip oscillator (125 kHz Typ.)
  • Voltage detection circuit (LVD):
    3 circuits (detection levels selectable)
  • Power-on reset (POR) circuit
  • Watchdog timer: 1 ch (supports hardware reset, selectable low-speed on-chip oscillator for the watchdog timer)
  • Multifunction timer: 3 ch
    - 8-bit timer 2 ch (Timer RA, Timer RB)
    - 16-bit timer 1 ch (Timer RC)
  • Real-time clock timer: 1ch
    - 8-bit timer 1 ch (Timer RE)
  • Serial interface: 3 ch
    - Clock synchronous/UART0, UART1, UART2
  • I2C/SSU*2: 4 circuits
  • A/D converter: 10-bit x 12 ch
  • Touch detector (SCU)*3: 5-input (shared with I/O ports)
    (Reduces power consumption by allowing touch detection in wait mode.)
  • I/O ports: Input/Output: 43, Input only: 1
    (Large-current drive capacity is provided. Variable input threshold values: 3 values)
  • Package:
    48-pin WPP (3 mm x 3 mm)


*1: A function to read the program ROM area during data flash programming or block erase operation.
*2: Synchronous serial communication unit
*3: Sensor control unit

Below you will find information to support the development of your application.
You can find an explanation of orderable part numbers here.


Resources for Software and Hardware

Title Description
My Renesas Create a My Renesas account to use our tool download services, receive e-newsletter/update notifications, and take advantage of our other services.
e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
Forum A forum and community site to share technical information, questions and opinions with others who use Renesas products.
Video Watch videos related to this product.


Software Design Support

Title Description
E1 A standard Renesas on-chip debugging emulator that enables users to carry out ample debugging for real development at low cost. (Also included with starter kits.)
E8a E8a is ideal for the modern development and prototyping environment with programming support for devices from all the main MCU families.

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