
This product is a real-time operating system (real-time OS) that is an implementation of the μITRON4.0 specification. μITRON is the predominant real-time OS for embedded systems in Japan. Its low resource requirements, outstanding real-time performance, and broad range of service calls make it very suitable for embedded systems requiring true real-time and multi-tasking capabilities.
In addition, its high degree of compatibility with the CS+ IDE and the configurator which automatically generates startup files will help you greatly reduce development times and get your products to market more quickly.
Latest Ver.: V1.00.02
Released: Nov 1, 2012
Details of upgrade (See Tool News)
Operating Environment
Agreement Details
User's Manual ( Coding: RI78V4 Real-time OS User's Manual: Coding (PDF | English, 日本語) | All )
Latest Ver.: V3.00.00
Released: Oct 1, 2014
Latest Ver.: V3.00.00
Released: Oct 1, 2014
Notes of Target Devices:
Devices with exceedingly low ROM or RAM capacity are not supported even if the groups they belong to are listed on the above list of supported devices. The standard capacities of ROM and RAM are stated below. Note that the required capacities also depend on the applications you will be using.
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Type | Title | Date |
Manual - Development Tools | PDF 524 KB 日本語 | |
Manual - Development Tools | PDF 157 KB 日本語 | |
Tool News - Release | PDF 265 KB 日本語 | |
Release Note | PDF 248 KB 日本語 | |
Tool News - Release | PDF 266 KB 日本語 | |
Tool News - Release | PDF 203 KB 日本語 | |
Tool News - Release | PDF 368 KB 日本語 | |
Tool News - Release | PDF 240 KB 日本語 | |
Tool News - Note | PDF 203 KB 日本語 | |
Tool News - Note | PDF 201 KB 日本語 | |
Tool News - Release | PDF 261 KB 日本語 | |
Manual - Development Tools | PDF 1.39 MB 日本語 | |
Manual - Development Tools | PDF 458 KB 日本語 | |
Tool News - Note | PDF 202 KB 日本語 | |
Tool News - Release | PDF 202 KB 日本語 | |
Tool News - Release | PDF 203 KB | |
Manual - Development Tools | PDF 834 KB 日本語 | |
17 items
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The RI78V4 kernel consists of the following modules. Each module is provided by functions (service calls) .
Target device | RL78 Family, 78K0R |
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Maximum number of tasks | 127 |
Number of priority levels | 15 |
Service call number | 66 |
Performance (Time takes for a target task to be executed after the wup_tas is issued.) |
49.2 microseconds (78K0R/Kx3, 10MHz. embedded memory) |
Kernel code size | From 2.9K bytes to 7.7K bytes |
Kernel RAM usage per task | data : 24 bytes stack : 28 bytes |
Provided items | Explanation | Note |
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Kernel source program | Kernel source program | Provided only with mass- production licenses which include source code. |
Kernel library | Kernel library for system building | — |
Standard header files | ITRON specification common definition files Kernel specification definition files Other definition files |
Header files are provided both in C languages |
Command line configurator | Outputs all types of definition files from the cfg file that describes the structure parameters in text. | — |
Sample program | A simple program using ITRON. | — |
CS+ interface plug-ins - RTOS Common plug-in - Plug-in for RI78V4 |
Function for easy kernel embedding Function for referencing the OS state during debug |
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System performance analyzer | A tool that displays a transition diagram of the OS operation history and analyzes performance, such as CPU usage rate. | — |
Manual | User's manual | — |