As a sophisticated on-chip debugging emulator and flash programmer, the E20 emulator provides enhanced trace functions and RAM monitoring functions for RX600 and RX700 products, and the full basic debugging functionality equivalent to the E2 emulator Lite. It is capable of large-capacity tracing for enhanced debugging in combination with MCUs that incorporate trace output functionality.


  • Enhanced functions for faster debugging [Learn More :On-chip Debuggers Performance Property]
    In addition to all the debugging functions of the E2 emulator Lite, the E20 supports powerful functionality such as larger trace capacity and realtime RAM monitoring. In addition, coverage function is supported on some MCUs of RX64M and RX71M Group.。
  • 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
[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.
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)


List of know-how when using E1/E20 emulator in CS+ environment (CS+, E2, E2 Lite, E1, E20)
List of know-how when using E1/E20 emulator in HEW environment
Could trace facilities assigned be used as pins for other tracing? (E2, E2 Lite, E1, E20) [RX]

See all related FAQs

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


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. The specific features of the E20 emulator such as the large trace function and the real-time RAM monitoring function are available only when using with MCUs of the RX600 or RX700 series. When using with MCUs of other than the RX600 or RX700 series, the supported functions for debugging correspond to those of the E2 emulator Lite.

Important : On the use of specific features of the E20 emulator
The signals used for the large trace and real-time RAM monitoring functions of the E20 emulator are multiplexed with those for other peripheral functions. Whether the large trace and real-time RAM monitoring functions of the E20 emulator are available depends on the MCU, package, and peripheral functions that you will be using.
We recommend that you read the user’s manual for the MCU you are using and check if there is any conflict of functions on the trace pins.
You can use the Smart Configurator to make pin settings through a GUI and check for conflicts between multiplexed functions.
If the MCU you are using is supported by a debug MCU board and you use the board, all of the MCU pins are available for use by the user system.

  • Connection system
  • Break function
  • Trace function
  • Memory reference and change while executing the program
  • Performance measurement
  • Real-time RAM monitoring
  • C0 Coverage
  • Hot plug-in
See On-chip Debuggers Performance Property (PDF | English, 日本語).
On-board programmingSupported
User interface38-way cable
[2-5767004-2 (product of Tyco Electronics Corporation)]
14-way cable Note1
[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.)
User's resource possessionSome MCUs possess the port peripheral functions.
Power supplyNot supported
Power voltage1.8V to 5.5V (depending on the target MCU)
External dimension
(Except the protruding parts)
114.9 mm×74.2 mm×19.2 mm
Conformance with overseas standardsEuropean Standards: EN 55022 Class A, EN 55024
US FCC Standard: FCC part 15 Class A


  1. The available debugging function corresponds to that of E2 Emulator Lite. Even when using with E20, the large trace function and Real-time RAM monitoring, specific functions of E20, are not supported.


  • E20 Emulator main unit
  • USB cable
  • User's system I/F cable
  • 38-pin/14-pin converter adapter [R0E000200CKA00] *Available for purchase in single unit.
  • Software CD-ROM
    • Installation guide
    • Self-Checking Program
    • USB driver
    • E1/E20 Emulator User's Manual

System Configuration

System Configuration

>> Refer to the system configuration in case of using the E20 emulator as a flash programmer

Optional Products

Following optional products are provided to facilitate the use of the E20 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.

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
38-Pin to 14-Pin Conversion Adapter for the E20 Emulator
(Bundled with the E20 Emulator)
R0E000200CKA00 User's Manual (38-Pin to 14-Pin Conversion Adapter for E20 Emulator) Rev.1.00 (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

lens Available | — Not Available


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 E20 Emulator
R0E000200ACB10 User's Manual (Isolator for E20 Emulator) Rev.2.00 (PDF | English, 日本語)
(For the RX family)
lens Note1

lens Available | — Not Available


  1. The isolator is not usable in combination with the debug MCU board for the RX71M group.

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
Debug MCU Board for RX Family
Supported devices for Debug MCU Board for RX Family [On-chip Debugger] (PDF | English, 日本語)
This board enables the use of all user port pins of the MCU in the user system. The E20 emulator occupies some of the pins for control of the emulator and the output of trace information, and these pins must be connected with a 38-pin connector attached to the E20 emulator on the user system. However, the Debug MCU board enables the use of all user port pins because connection with a 38-pin connector on the user system is not required.
You can also obtain trace information even while using an MCU that does not have a trace function.

lens Available | — Not Available

System configuration
System configuration

Design Support

E20 emulator [R0E000200KCT00] Information for Users