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SPECIFICTION
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CS+

renesas.com

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Spec score 8.0 #6 of 29 in Embedded Development IDEs

What it is

CS+ is Renesas’s integrated development environment for creating software for Renesas microcontrollers. The free IDE is available for development and production, while evaluation compiler packages may impose limits. CS+ for CC targets the RL78, RH850, and RX families; CS+ for CA,CX targets RL78, 78K, and V850. Its installer includes compiler packages for target products, and compatible Renesas emulators provide debugging functions. The graphical interface can generate C device-driver programs for MCU peripherals, although generation is unavailable for some MCUs. Modified or saved source files build automatically in the background, and action events can show variable values at a specified address. Smart Browser for CS+ for CC presents device information, hardware manual content, sample code, and related FAQs. CS+ can interoperate with Smart Configurator for RX, and Renesas offers a co-simulation tool linking it with MATLAB and Simulink. Current listed versions run on Windows 10 64-bit and Windows 11; 32-bit use requires CS+ IDE V8.06 or earlier. Debugging emulators are sold separately.

Spec sheet

Purpose
CS+ is an integrated development environment and coding tool for developing software for Renesas MCUs.Read 3 Oct 2026 · renesas.com
Integrations
CS+ can interoperate with Smart Configurator for the RX family, and Renesas offers a co-simulation tool linking CS+ with MATLAB and Simulink.Read 3 Oct 2026 · renesas.com
Support
Renesas offers online support communities, a knowledge base, and ticket submission for technical questions or confidential information.Read 3 Oct 2026 · renesas.com
Headquarters
Tokyo, JapanRead 28 Sep 2026 · renesas.com
Founded
2002Read 28 Sep 2026 · renesas.com
Build and debug
CS+ automatically builds modified or saved source files in the background and supports action events that display variable values at a specified address.Read 3 Oct 2026 · renesas.com
Code generation
Its GUI can generate C device driver programs for MCU peripheral functions, though some MCUs do not support this feature.Read 3 Oct 2026 · renesas.com
Emulators
Compatible debugging emulators are sold separately; listed models include IECUBE, IE850, IE850A, E2, E2 Lite, and E20.Read 3 Oct 2026 · renesas.com
Evaluation distinction
CS+ itself has no evaluation edition; evaluation compiler packages have their own periods and limitations, while the IDE product is available for free.Read 3 Oct 2026 · renesas.com
Included tools
The CS+ installer includes compiler packages for target products, and compatible Renesas emulators can provide debugging functions.Read 3 Oct 2026 · renesas.com
Operating system
The listed operating environment for current CS+ versions is Windows 10 64-bit and Windows 11; 32-bit use requires CS+ IDE V8.06 or earlier.Read 3 Oct 2026 · renesas.com
Regional availability
Renesas says CS+ is not generally promoted to customers in the U.S. and Europe and directs interested customers there to regional marketing departments.Read 3 Oct 2026 · renesas.com
Security feature
Main-core debugging supports developing user programs while keeping secure information confidential from engineers working on non-secure programs.Read 3 Oct 2026 · renesas.com
Smart Browser
For CS+ for CC, Smart Browser displays device information, hardware manual content, sample code, and related FAQs.Read 3 Oct 2026 · renesas.com
Target families
CS+ for CC supports RL78, RH850, and RX families, while CS+ for CA,CX supports RL78, 78K, and V850 families.Read 3 Oct 2026 · renesas.com

Plans and prices

CS+ for CA,CX Free IDE is free · compiler evaluation editions may restrict object size or available memory Read 3 Oct 2026 · renesas.com
CS+ for CC Free IDE is free for development and production · compiler evaluation limits apply when using an evaluation compiler Read 3 Oct 2026 · renesas.com

Every CS+ plan and price →

Strong points and limits

Strong points

  • IDE is free for development and production.
  • Modified or saved files build in the background.
  • Smart Browser includes device and manual information.
  • Supports integration with Smart Configurator for RX.

Limits

  • Compatible debugging emulators are sold separately.
  • Evaluation compiler packages may impose limits.
  • Current listed versions require Windows 10 64-bit or Windows 11.
  • Some MCUs do not support code generation.

Who it suits

CS+ suits developers building software for the Renesas MCU families supported by its two variants. It is relevant to users who need integrated build and debug tools, with compatible Renesas emulators for debugging.

Verdict

CS+ provides a free IDE for software development on supported Renesas MCUs, with compiler packages and background builds. Check the target family, operating system, compiler evaluation limits, and separate emulator costs before choosing it.

Where Specifiction places it

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