The E1 emulator is an on-chip debugging emulator and flash programmer which supports the major Renesas MCUs. This economical development tool provides basic debugging functionality. Available optional products, such as the hot-plug-in adaptor, allow you to extend debugging functionality or adjust connections.


Item Description
For RX or RL78 Family MCU Users E2 emulator or E2 emulator Lite
For RH850 Family MCU Users E2 emulator


  1. No successors to E1 for V850、78K0R、78K0 or R8C* Family MCU Users.
    *E8a emulator supports R8C/3x or R8C/Lx Series MCU.


  • Affordable yet powerful debugging device that can meet the actual development needs.
    Learn more (On-chip Debuggers Performance Property) >>
  • Enhanced functions for faster debugging
    In addition to basic debugging functions, the E1 supports execution time measurement and hot plug-in functionality (dependent on the MCU) that allows connection to the user system while the program is running.
  • Also functions as an on-board programmer.
    Can be used as an on-board programming tool after the debugging, enabling smooth evaluation of the MCU.
  • Optimally suited for evaluating analogue functions such as A/D and D/A properties.
    Electrical characteristics are the same as those of the actual MCU, since the actual MCU is used for debugging.
  • Serial, JTAG and LPD connections are supported.
    For the communication system, serial, JTAG or LPD connection can be selected as required by the type of the target MCU.
  • Simple connection
    Connection requires only a connector mounted on the user system, thus significantly reducing the possibility of loose connection.
  • Environmentally friendly material
    The casing is made of plant-derived polylactide (PLA).
  • Learn More

Release Information

Purpose of useSoftware to be usedTarget devicesNote1Latest VersionReleasedOperating Environment
On-chip DebuggingCS+
*Evaluation Software Download
RX, RL78, RH850
[Details] Functions Supported by CS+ (PDF | English, 日本語)
V8.11.00Note3Jan. 22, 2024Operating Environment
e² studio
RX, RL78, RH850
[Details] Release notes
(64-bit version) 2024-01.1Jan. 29, 2024
(32-bit version) V7.8.0Apr. 20, 2020
IAR Embedded WorkbenchNote2RX, RL78, RH850Contact IAR Systems.
Green Hills MultiNote2RH850Contact Green Hills Software.
iSYSTEM winIDEANote2RL78, RH850Contact iSYSTEM.
Flash ProgrammingRenesas Flash Programmer V3
*Evaluation Software Download
RL78, RX, RH850
[Details] List of MCUs supported by Renesas Flash Programmer V3 (PDF | English, 日本語)
V3.14.00Jan. 22, 2024Operating Environment


  1. For details when using devices of V850 family, 78K0R, 78K0, or R8C family, see E1/E20 software for V850, 78K0R, 78K0, or R8C MCU >>.
  2. As for tools produced by partners, contact them directly.
  3. If you hope to continue to use the product on the Windows 32-bit version, use the CS+ IDE V8.06 and earlier that supports the 32-bit versions.
    [Notification] End of Support: CS+ Integrated Development Environment for Windows 32-Bit Versions (PDF | English, 日本語)

Target Devices

Target Family


Type Title Date
Upgrade - IDE Log in to Download ZIP 5.07 MB 日本語
Software & Tools - Other Log in to Download ZIP 1.21 MB 日本語
Upgrade - Programmer Log in to Download ZIP 730 KB 日本語
3 items


Design & Development

Sample Code

Additional Details


Note that some functions shown here may not be supported under the IDE you use. Performance property and Connection system also vary depending on the MCU type.

  • Connection system
  • Break function
  • Trace function
  • Memory reference and change while executing the program
  • Performance measurement
  • Hot plug-in
See On-chip Debuggers Performance Property (PDF | English, 日本語).
On-board programmingSupported
User interface14-way cable
[7614-6002 (product of 3M Co., Ltd.) and 2514-6002 (product of 3M Limited)]
PC InterfaceUSB 2.0, full speed and high speed
Target board connectionVia attached user I/F cable (Connection signals vary by the target MCU type.)
Operating voltage range1.8V to 5.5V (depends on the target MCU)
Power supply from EmulatorSupply current: Up to 200mA, Supply voltage: 3.3V or 5V
External dimension
(Except the protruding parts)
109.4 mm×53.2 mm×18.6 mm
Conformance with overseas standardsEuropean Standards: EN 55022 Class A, EN 55024
US FCC Standard: FCC part 15 Class A


  • E1 Emulator main unit
  • USB cable
  • User's system I/F cable
  • Software CD-ROM
    • Installation guide
    • Self-Checking Program
    • USB driver
    • E1/E20 Emulator User's Manual

System Configuration

System Configuration

Optional Products

Following optional products are provided to facilitate the use of the E1 emulators. Please make sure to choose the products that match MCUs you use.

Conversion Adapter

Converts the number and pitch of the pins in the connector for the connection with the emulator.

14-Pin to 38-Pin Conversion Adapter for the E1 Emulator
R0E000010CKZ00 User's Manual (14-Pin to 38-Pin Conversion Adapter for E1 Emulator) (PDF | English, 日本語)
An adapter for converting the 14-pin/2.54-mm pitch connector on the head of the emulator user interface cable to a 38-pin/0.5-mm pitch connector
38-Pin Conversion Adapter for the E1 Emulator
QB-F14T38V850-01 User's Manual (14-Pin to 38-Pin Conversion Adapter for E1 Emulator) (PDF)
An adapter for changing to a 14-pin user interface for connection to a Mictor connector mounted on a V850-based target system
Small Connector Conversion Adapter for the E1 Emulator
R0E000010CKZ11 User's Manual (Small Connector Conversion Adapter for E1 Emulator) (PDF | English, 日本語)
An adapter for converting the 14-pin/2.54-mm pitch connector on the head of the emulator user interface cable to a 14-pin/1.27-mm pitch connector
14-Pin to 16-Pin Conversion Adapter for the E1 Emulator
QB-F14T16-01 User's Manual (14-Pin to 16-Pin Conversion Adapter for E1 Emulator) (PDF)
An adapter for changing the 14-pin/2.54-mm pitch connector on the head of the E1 emulator user interface cable to a MINICUBE2-compliant 16-pin/2.54-mm pitch connector

lens Available | — Not Available

Hot-plug Adapter

Allows you to connect the emulator without having to turn off the system (Hot Plugin).

Hot-plug Adapter for the E1 Emulator
R0E000010ACB00 User's Manual (Hot-plug Adapter for E1 Emulator) Rev.1.01 (PDF | English, 日本語)
An adapter that allows connection of an emulator to a running user system without turning the power off
lens Note1lens Note1lens Note1lens Note1

lens Available | — Not Available


  1. Refer to On-chip Debuggers Performance Property (PDF | English, 日本語) for the applicable MCU groups.


Enables debugging in an environment where there is a difference in potential between the user system GND and the host PC GND.

Isolator for the E1 Emulator
R0E000010ACB10 User's Manual (Isolator for E1 Emulator) (PDF | English, 日本語)
(For the RX or the R8C family)
Isolator for the E1 Emulator
R0E000010ACB20 User's Manual (Isolator for E1 Emulator) (PDF | English, 日本語)
(For the RL78 or the RH850 family)

lens Available | — Not Available

Low voltage OCD Board

Enables you to debug the target MCU, even if the adapter voltage is not high enough to reprogram internal Flash ROM. This product is used between the emulator and a user's system, and is united by the in-circuit connection with the user's system.

Low voltage OCD Board for RL78/G10 (10-pin/16-pin)
Low voltage OCD Board for RL78/G10 (10pin, 16pin) Rev.1.00 (PDF | English, 日本語)
An OCD board for debugging an RL78/G10 MCU (10-pin or 16-pin) with an adapter voltage below 4.5 V

lens Available | — Not Available

Debug MCU Board

Enables the in-circuit connection of the emulator with the user's system. This board allows you to use enhanced debugging functions. The applicable debugging function varies depending on the MCU type.


Debug MCU Board for RH850  
Supported devices for Debug MCU Board for RH850 Family [On-chip Debugger] (PDF | English, 日本語)
This board enables use of the trace function even if the target MCU does not have a trace function. The Debug MCU Board is for use in combination with a separately available 176-pin (with internal trace function) MCU of the RH850/F1L group.

Note: The package of the Debug MCU Board does not include the MCU. Please purchase it separately. For details, contact either a Renesas Electronics Corporation representative (responsible for sales) or distributor.


lens Available | — Not Available

System configuration

System Configuration

Design Support

E1 emulator [R0E000010KCE00] Information for Users

Information on the discontinuation of E1 emulator production and on its successor products

We have already discontinued production of the E1 emulator due to components of the product having reached their EOL (end of life, i.e. end of production). Please click on the following link to confirm the details and our successor products.

>> Tool News: [Notification] End of Life (EOL) Notice for E1 Emulator (PDF | English, 日本語)