IAR Embedded Workbench for Renesas H8

The complete development toolchain IAR Embedded Workbench for Renesas H8 provides one toolbox in one view, giving you one uninterrupted workflow.


User-friendly IDE

Integrated development environment with project management tools and editor. It includes automatic checking of MISRA C rules (MISRA-C:2004), configuration files for all H8/300H and H8S families, linker and library tools, example projects for H8 and code templates as well as Subversion integration.


Powerful build tools

The IAR C/C++ Compiler is a highly optimizing C and C++ compiler for H8 including run-time libraries and a relocating H8 assembler.


Comprehensive debugger

The C-SPY Debugger comes with a H8 simulator, support for RTOS-aware debugging on hardware and C-SPY support for Renesas E8/E8a Emulator and Renesas E10A-USB Emulator. Also included is support for Renesas High Performance Workshop via compatible ELF/DWARF output format.


On-demand training included

When you buy a license of IAR Embedded Workbench for Renesas H8, you get access to free training courses through our IAR Academy on Demand offering.

Latest releases

We are constantly updating and refining our tools with new features, new device support and extended capabilities.

Version 2.40

New text editor and source browser

A new text editor and source browser are introduced in this version. The new features include auto completion, parameter hint, code folding, block select, block indent, bracket matching, zoom and word/paragraph navigation. The new source browser adds features like Go to Declaration and Find All References to symbols.

New licensing management system (LMS) introduced

The new LMS used with this release introduces new features like commuter licenses, automatic license activation and support for virtual servers.

Sampled Graphs in C-SPY

It is now possible to specify variables for which you want to collect data samples. You can view the sampled data either in table format in the Data Sample window or as graphs in the Sampled Graphs window.

Custom SFR window

It is now possible to define custom SFR's (special function registers) in C-SPY with selectable access size and type.

Call Graph window

A new Call Graph window has been added. It is browsable and displays all calls made to and from each function from any source file in the active project.

Macro Quicklaunch window

The new Macro Quicklaunch window makes it possible to evaluate expressions and to launch C-SPY macros. The return value from the evaluated macro or expression is shown in a separate column and the user can re-trigger the evaluation at any given point.


The version control integration has been extended with support for Subversion (SVN).

Read complete release notes

Version 2.30

H8SX device files and debugger support

IAR Embedded Workbench for H8 can be used with H8SX devices as this core is binary compatible with H8S. Therefore, device files and E10A-USB debugger support for H8X is now included. Note: The H8SX extended instruction set is not supported.

E10A-USB and E8a debugger improvements

Support for new devices, possibility to watch variables during program execution, and support for new breakpoint types are some of the C-SPY driver improvements.

64-bit USB drivers

64-bit USB drivers have been added for E10A-USB and E8a.

Downloading multiple images with C-SPY

C-SPY is now able to download multiple images/applications at the same time. There is also a new debugger window called Images where you select for which application debug information shall be displayed.

Debug without downloading

You can now start the debugger with or without downloading code, using two new buttons on the toolbar and two new Project menu entries. There are also two new corresponding ways to restart the debugger during the debug session.

Edit breakpoints

When you open the context menu from a row with one or more breakpoints, an entry Edit Breakpoint is now available. This will open the Edit Breakpoint dialog box that previously was available only from the Breakpoint window.

Auto refresh in Memory window

The C-SPY Memory window now has two new buttons on the toolbar. One button refreshes the window once and one button activates periodical refreshing of the window as long as the debugger is running.

Checksumming of segments by name

It is now possible to specify the name of a segment in a checksum command. This adds the start and end address of the segment to the range that is checksummed.

Updated device support

SFR header files, linker command files and device description files have been added for the latest Renesas devices including H8SX.

Information Center

An integrated navigation system that gives easy access to tutorials, product documentation, and example projects.

What type of license do you need?

Our tools are available in a flexible license model to suit your company needs. Together with our support and update agreements, you get the support you need in multiple time zones and multiple languages. Send a request for quote or contact sales to get started.

Read more about Licenses

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User guides and documentation

Languages and standards

The IAR C/C++ compilers offer different dialects of the C and C++ programming languages, as well as different extensions specific for embedded programming (please note that not all language standards are supported for all target implementations). The compiler can be instructed to disable extensions for strict conformance to the standards. 

A wide range of industry-standard debug and image formats compatible with most popular debuggers and emulators are supported. This includes ELF/DWARF where applicable.

ISO/ANSI C/C++ Compliance

The IAR C/C++ compilers adhere to a freestanding implementation of the following C programming language standards:

  • INCITS/ISO/IEC 9899:2018, known as C18 (Latest version only).
  • The compiler supports all C++17 features. The C++ library supports C++14 with no C++17 additions.  (Latest version only).
  • ISO/IEC 14882:2015, known as C++14
  • INCITS/ISO/IEC 9899:2012, known as C11
  • ANSI X3.159-1989, known as C89

The ISO/ANSI C/C++ Compliance level varies between the different compilers. For complete information, please refer to the IAR C/C++ Compiler user documentation in your chosen product.

IEEE 754 standard

IAR Embedded Workbench supports the IEEE 754 standard for floating-point arithmetic.


MISRA C is a software development standard for the C programming language developed by MISRA, The Motor Industry Software Reliability Association. Its aims are to facilitate code safety, portability and reliability in the context of embedded systems, specifically those systems programmed in ISO C.

The first edition of the MISRA C standard, "Guidelines for the use of the C language in vehicle based software", was produced in 1998. In 2004, a second edition was produced with many substantial changes to the guidelines, including a complete renumbering of the rules. Additionally MISRA C:2012 with extended support and MISRA C++:2008 for identifying unsafe code constructs in the C++ standard have also been added to the standards.

IAR Embedded Workbench features an add-on product C-STAT so you can check compliance with rules as defined by MISRA C:2004, MISRA C++:2008 and MISRA C:2012.

Test validation

We use the following commercial test suites to test conformance of our tools to the standards:

  • Plum Hall Validation test suite for ISO/IEC C conformance
  • Perennial EC++ Validation Suite for C++ conformance
  • Dinkum C++ Proofer to test how our libraries conform to the C and C++ standard as well as test our STL implementation against the C++ standard.

In addition to the commercial suites, we use several in-house test suites for testing new features, regression testing, corrected errors, etc.

Download free trial

IAR Embedded Workbench for Renesas H8 - Free trial version

The evaluation license is completely free of charge and allows you to try the software to evaluate its efficiency and ease of use. You can choose either a 14-days trial version or a size-limited version.

When you click download, you will be asked to register to get your license.

Please note the following for the 14-day time-limited version:

  • Time limit for evaluation license is 14 days
  • Source code for runtime libraries is not included
  • No support for MISRA C
  • Limited technical support
  • Must not be used for product development or any other kind of commercial use.

Restrictions to the Kickstart, size-limited evaluation

  • A 16 Kbyte code size limitation.
  • Source code for runtime libraries is not included.
  • No support for MISRA C.
  • Limited technical support.
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