The IECUBE for RL78 Family is a high-performance full-spec emulator for the RL78 MCU family. It provides high-performance debugging functions such as time measurement, coverage, and trace. In addition, a self-testing function detects faults in the IECUBE and performs maintenance.

The IECUBE for 78K

Release Information

Software to be used Target devices Latest Version Released Operating Environment
*Evaluation Software Download
[More details]
 List of Functions Supported by CS+
V8.04.00 Jul. 20, 2020 Operating Environment
e² studio
[More details]
*See "Target devices".
(64-bit version)
Oct. 06, 2020
(32-bit version)
Apr. 20, 2020
IAR Embedded Workbench Note1 RL78 For the details, contact IAR Systems.


  1. As for tools produced by partners, Contact IAR Systems.

Details of upgrade (See Tool News)


Simple setup
Full-spec emulator and emulation board in a single unit
Rich debugging functions
Enhanced time measurement and real-time RAM monitoring functions
Enhanced maintenance features
Self-testing function to detect faults in the IECUBE and performs maintenance
Compact and lightweight
Easy to carry. Fits in the palm of your hand.


Real-Time RAM Monitor Function
Updates RAM values in real time.

Trace Function with Time Tag Function
The time per instruction unit can be recorded in the trace window.

Performance Measurement Function
Measures the time required for program functions to execute.

Coverage Measurement Function
The executed ratio can be measured for specific functions and actions.


  • Emulator main unit (IECUBE)
  • Software CD-ROM (USB driver is included)
  • USB interface cable
  • User's Manuals

For development work, a power supply adapter and optional products such as probe or socket compatible with the target device, all sold separately, are required. Refer to the system configuration example below for details.

System Configuration Example

Optional Products (Sold Separately)

  • Power Supply Adapter
    Specifications of the power supply adapter, QB-COMMON-PW-xx, vary depending on the region. Be sure to use an adapter designed for your region.


Maximum operating frequency Depending on the target MCU
Emulation memory capacity Internal ROM Internal ROM capacity of target MCUs
Internal RAM Internal RAM capacity of target MCUs
Event For execution 8 points
For access 8 points
Break Hardware break 20 points Note1
Software break 2,000 points
Forced break Supported
Step execution Supported
Fail-safe break Supported
Trace Trace capacity 128K frame
Trace item
  • All orders (Address/ Data)
  • Access (Address/ Data)
  • Time stamp
Performance measurement Execution time measurement between the start and the stop of the program Supported
Measurement between events Supported (2 segments)
Result-display item of measurement between events Total value, Number of passage,
Maximum value, Minimum value, Average value
Time-out break Supported
Real-time RAM monitor PC/ Internal RAM area Note2
Coverage Memory capacity Internal ROM gamut  +  External memory area
PC interface USB (USB 2.0, Full-speed/ High-speed, USB 1.1)
Operating Environment Refer to Operating Environments of Products.
External dimension (mm) 113mm × 109mm × 58-67mm Note3
Conformance with overseas standards European Standards: EN 55022 Class A, EN 55024
US FCC Standard: FCC part 15 Class A


  1. Items are 8 points of post-execution break, 8 points of Access break, and 4 points of before-execution break. The number of before-execution break varies depending on the settings position.
  2. For all memory areas except target memory area (out of the range that real-time RAM monitor is supported), pseudo RRM function that implements monitoring while pausing program execution is supported.
  3. Not including the protruding parts.

Information Supporting Development Tools

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 MCU's.
Tool News Tool release information and other important information.
Operating Environment Information on system requirements and operating environment for the latest version of tools.
Tool Environmental Information Information on RoHS compliance of tools.
Info on Discontinued Products A list of Renesas software and tools that have been discontinued and are no longer being offered for new projects.