概述
描述
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 compiler package from Renesas Electronics and the configurator which automatically generates startup files will help you greatly reduce development times and get your products to market more quickly.
Successors:M3T-MR30/4 Real-time OS for M16C Series and R8C Family
特性
- Conformance with the µITRON4.0 Specification
The design conforms with the µITRON4.0 Specification, which prescribes a representative OS architecture for embedded control. - ROM-based implementation
The kernel is provided in library format. You can link only the functions you need at the time of system generation and minimize application software size. - Equipped with the configurator
The configurator is equipped which makes the setup of OS construction parameters easier. Using the combination of GUI configurator and cfg8c configurator based command line lets you automatically generate start-up programs that rely on development products by just creating a simple definition file (configuration file), and so on. You can easily and reliably process parts specially suited to the product. [Learn More] - Interlinking with the High-performance Embedded Workshop IDE
OS-embedded applications can be developed using common operations of the Renesas MCU toolchain. - Supported compiler: C/C++ Compiler Package for M16C Series and R8C Family [M3T-NC30WA]
- Learn More
发布信息
Latest Ver.: V1.01.00
Released: Sep 16, 2011
Details of upgrade (See Tool News)
Operating Environment
Agreement Details
目标设备
下载
|
|
|
|
|---|---|---|
| 类型 | 文档标题 | 日期 |
| 升级 - OS | High-performance Embedded Workshop Real-Time OS Aware Debugging Upgrade module
|
|
| 升级 - OS | Real-time OS for R8C Family MR8C/4 V.1.01 Release 00 (Evaluation License) Upgrade
|
|
| 升级 - OS | Real-time OS for R8C Family MR8C/4 V.1.01 Release 00 (Mass-production License/No source code) Upgrade
|
|
| 升级 - OS | Real-time OS for R8C Family MR8C/4 V.1.01 Release 00 (Mass-production License/With source code) Upgrade
|
|
4 项目
|
||
文档
请登录后开启订阅
|
|
|
|
|---|---|---|
| 类型 | 文档标题 | 日期 |
| 发行说明 | PDF 237 KB 日本語 | |
| 工具新闻 - 注意事项 | PDF 204 KB 日本語 | |
| 手册 - 开发工具 | PDF 1.07 MB 日本語 | |
| 工具新闻 - 发布公告 | PDF 202 KB 日本語 | |
| 应用说明 |
PDF
695 KB
AI 生成的摘要:
Interrupts enable embedded systems to handle time-critical tasks by signaling the processor to pause current operations and address urgent events. There are hardware and software interrupts, with hardware interrupts further divided into special and peripheral I/O types. The R8C family uses two interrupt vector tables: fixed and relocatable, which store interrupt service routines and their properties. Interrupt priority levels allow nested interrupts, and interrupts can be maskable or non-maskable, with NMIs reserved for critical system events.
|
|
| 应用说明 |
PDF
126 KB
AI 生成的摘要:
The system timer in MR8C/4 tracks elapsed time in an RTOS by generating periodic interrupts, incrementing a tick counter. The timer's resolution depends on application needs, hardware limitations, and counter storage. MR8C/4 uses a 6-byte counter allowing up to 8925 years of tick counting at 1ms resolution. Hardware timer inaccuracies require adjustments to ensure minimum delay durations. Users configure the system timer by selecting hardware timers, setting interrupt priorities, and defining interrupt vectors. The system timer manages time-based functions and is optional if no time management is used.
|
|
| 应用说明 |
PDF
938 KB
AI 生成的摘要:
MR8C/4 provides two types of time event handlers: cyclic handlers for repetitive events at fixed intervals, and alarm handlers for one-shot events at specified times. These handlers operate independently from tasks, executing in non-task contexts with priority between interrupts and dispatchers. Time event handlers must be statically created in configuration files and require the CPU to be unlocked for activation. Accuracy depends on system timer resolution, with R8C devices supporting up to 1 ms resolution. Cyclic handlers can be used to trigger tasks periodically without reprogramming timers.
|
|
| 应用说明 |
PDF
750 KB
日本語
AI 生成的摘要:
Real-time OS aware debugging supports various real-time operating systems including HI7200/MP, ThreadX, uC/OS-II, and TOPPERS variants. It operates within High-performance Embedded Workshop on Windows platforms and integrates with SuperH Family RISC engine simulators/debuggers. The document details environment setup, program downloading, OS definition selection, task state monitoring, execution history, and timing display functions.
|
|
| 指南 | PDF 371 KB 日本語 | |
| 应用说明 |
PDF
801 KB
AI 生成的摘要:
Real-Time Operating Systems (RTOS) enable multitasking in embedded systems by providing timely and logically correct responses to events. RTOS combines real-time requirements with operating system features such as multitasking, synchronization, interrupt handling, and resource management. This document explains RTOS concepts, architecture, and selection criteria, focusing on their application in the R8C microcontroller family and highlighting their deterministic timing and efficient resource use.
|
|
| 应用说明 |
PDF
760 KB
AI 生成的摘要:
MR8C/4 is a preemptive priority-based RTOS designed for embedded applications using the R8C family MCU. Implementing MR8C/4 requires careful task partitioning, prioritization, and interrupt management to ensure real-time responsiveness. The RTOS increases memory usage due to additional code and task stacks, so memory allocation must be optimized. Proper implementation also helps reduce power consumption by enabling efficient CPU usage and minimizing memory waste.
|
|
| 应用说明 |
PDF
152 KB
日本語
AI 生成的摘要:
The MR8C/4 excludes service calls with timeout features to minimize memory usage. This document explains a workaround to implement timeout functionality by forcibly releasing tasks from the WAITING state using a timer. It details the removal of timeout-enabled service calls like tslp_tsk, twai_sem, and others, and illustrates how to apply the workaround method, particularly for the wai_sem service call, using a sample program.
|
|
| 应用说明 |
PDF
325 KB
日本語
AI 生成的摘要:
The document explains how to replace the Mailbox module, excluded in MR8C/4, with the Data Queue module for inter-task communication in R8C family MCUs. It compares the functionalities of Mailbox and Data Queue, highlighting that Mailbox manages message queues and wait queues for synchronization, while Data Queue handles one-word data elements with send and receive wait queues. Step-by-step guidance for converting Mailbox usage to Data Queue is provided.
|
|
| 工具新闻 - 发布公告 | PDF 195 KB 日本語 | |
| 应用说明 |
PDF
310 KB
English
AI 生成的摘要:
本文介绍了M16C/Tiny系列定时器A在事件计数模式和自由运行方式下的操作。详细说明了可选功能、计数开始、下降沿计数、溢出时不重载继续计数以及递增/递减计数切换等步骤。同时介绍了实现这些功能所需的寄存器设置，包括模式选择、计数极性和触发标志，适用于具有相同特殊功能寄存器定义的M16C/26A、M16C/28和M16C/29系列单片机。
|
|
| 应用说明 |
PDF
316 KB
English
AI 生成的摘要:
本文介绍了定时器A在事件计数模式下处理二相脉冲信号及4倍频方式的操作。详细说明了功能选择、适用的单片机型号及实现所需的寄存器设置。内容包含基于输入信号边沿的递增/递减计数条件和时序图，强调了逐步配置以实现精确脉冲处理的重要性。
|
|
| 应用说明 |
PDF
334 KB
English
, 日本語
AI 生成的摘要:
本文介绍了M16C/Tiny系列单片机中看门狗定时器的使用方法，适用于M16C/26A、M16C/28、M16C/29系列。内容包括初始化方法、等待和停止模式下的计数行为，以及计时器溢出时产生中断的机制。还说明了看门狗定时器功能的寄存器设置，包括计数源选择和预分频器配置。特别提醒需定期写入看门狗定时器以避免复位，并说明中断触发时的复位行为。
|
|
17 项目
|
||
Additional Details
Successor
M3T-MR30/4 Real-time OS for M16C Series and R8C Family
Specifications
| Target MCU | R8C Family |
|---|---|
| Max. number of tasks | 255 |
| Number of priority levels | 255 |
| Max. number of eventflags | 255 |
| Width of an eventflag | 16 bits |
| Max. number of semaphores | 255 |
| Type of semaphores | Counter type |
| Max. number of data queue | 255 |
| Data queue size | 16 bits |
| Max. number of cyclic handler | 255 |
| Max. number of alarm handler | 255 |
| Number of service call | 43 |
| Kernel language | Assembly language, C language |
| Performance (Time takes for a target task to be executed after the wup_tas is issued.) | 19 microseconds (20MHz) |
| Kernel code size | Approximately 1.5K to 6.5K bytes |
| Kernel RAM usage per task | Data: 11 bytes Stack 8 bytes |
Components of Evaluation License Package
| Kernel library | mr8c.lib |
|---|---|
| Kernel library source files | Not included. (* Included with Mass-production License Package) |
| Configurator | cfg8c |
| Utilities | mr8ctbl |
| Default configuration file | default.cfg |
| C interface library | c8cmr.lib |
| C language include file | itron.h, kernel.h, kernel_api.h, kernel_sysint.h |
| Sample start-up program | [For NC30] crt0mr.a30 [For AS30] start.a30 |
| Sample Section definition file | [For NC30] c_sec.inc [For AS30] asm_sec.inc |
| System RAM area definition database file | sys_ram.inc |
| Table database file | mrtable.tpl |
| Service call file for issuing service call | isssys.mrc |
| Include database file | mr8c.inc |
| MR8C/4 version file | version |
| Sample program | demo.c, smp.cfg |
Components of Mass-production License Package
(1) With source code
- Components of Evaluation License Package
- Mass production rights (For details, see the License Agreement.)
- MR8C/4 kernel libraries (mr8c.lib) source files
(2) No source code
- Components of Evaluation License Package
- Mass production rights (For details, see the License Agreement.)
Processing Flow
图像
