The touch key microcontrollers (MCUs) of the R8C/33T Group are devices incorporating an electrostatic capacitive touch detector into the R8C/3x Series.

By integrating on a single chip a touch sensor IC for touch detection and a microcontroller for controlling the system based on the signals received, the R8C/33T Group specifically meets the following three customer needs.

  • More compact system size
  • Reduced power consumption
  • Improved noise tolerance


Main Solutions

Key Features:

  • CPU core: R8C 16-bit CPU core
  • Minimum instruction execution time:

50nsec (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: 16 KB/1.5 KB, 24 KB/2 KB, 32 KB/2.5 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: 3 circuits

-     XIN-XOUT main clock (oscillation stop detection circuit included)

-     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)
  • Multifunction timer: 3 ch

-     8-bit timer 2 ch (Timer RA, Timer RB)

-     16-bit timer 1 ch (Timer RC)

  • Serial interface: 3 ch

-     Clock synchronous/UART0, UART1, UART2 (Simple I2C/SSU*2)

-     Hardware LIN (UART & Timer RA)

  • A/D converter: 10-bit x 12 ch
  • Touch detector (SCU)*3: 18-input (shared with I/O ports)

(Reduces power consumption by allowing touch detection in wait mode.)

  •  I/O ports: Input/Output: 27, Input only: 1

(Large-current drive capacity is provided. Variable input threshold values: 3 values)

  • Package: 32-pin LQFP (7 mm x 7 mm, 0.8 mm pitch)   



*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.
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Resources for Software and Hardware

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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.


Hardware Design Support

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Reference oscillator circuit constants The resonators for which the operation is verified and their oscillator constants are shown below.
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