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Overview
Description
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.
Features
- Conformance with the µITRON4.0 Specification
The design conforms with the µITRON4.0 Specification, which prescribes a representative OS architecture for embedded control. - High performance: Fast interrupt response
For application requiring fast interrupt response time, M3T-MR308/4 is designed to realize fast response to an interrupt which does not issue a system call. - 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 cfg308 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] - C and Assembly user interfaces
When using the supported compiler package, the following features are available.- Kernel direct call: The kernel can be called without the C interface library. This function reduces code size and speeds up execution time.
- Simplified coding tasks and handlers: Start functions of a task or handler can be specified in the C source file, allowing start and termination processing optimization.
- Context selection function: A register to be saved at task-switching can be specified. This function eliminates unnecessary register saving, reduces stack usage, and offers improved execution speed.
- 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 Compiler Package for M32C/xx, M16C/70,80 series [M3T-NC308WA], Assembler: AS308
- Learn More
Release Information
Latest Ver.: V.4.00 Release 02
Released: Sep 1, 2006
Details of upgrade (See Tool News)
Operating Environment
Agreement Details
Target Devices
Additional Details
Functions
The M3T-MR308/4 kernel consists of the following modules. Each module is provided by functions (service calls) .
- Scheduler
Manages execution sequence of multiple tasks based on their priority levels. - Task management
Manages task status such as RUNNING, READY, WAITING or SUSPENDED. - Task-dependent synchronization
Changes task status from other task, and synchronizes tasks. - Interrupt processing
Returns from an interrupt handler, enables/disables an interrupt for each task, and so on. - Time management
Sets system timer used by M3T-MR308/4 kernel and starts user-defined alarm handler and cyclic handler. - System State Management
Reports information such as version number of M3T-MR308/4 kernel. - State management
Modifies and refers system status. - Synchronization/communication
Carries out synchronization and communication between tasks. The following function modules are available:- Event flag
Tasks are synchronized by the status of flags managed by the kernel. - Semaphore
Tasks are synchronized by the semaphore counter value managed by the kernel. - Mail box
Tasks are synchronized by sending or receiving a message. - Data queue
Tasks are synchronized by communicating 4-byte data.
- Event flag
- Memory pool management
Dynamically allocates/frees memory area used by tasks. Enables efficient use of memory. - Cyclic handler function
Controlls the execution of a handler activated periodically. - Alarm handler function
Controlls the execution of a handler activated at the specified relative-time.
Specifications
| Target MCU | M32C/80, M16C/80 Series |
|---|---|
| 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 mail boxes | 255 |
| Max. number of data queue | 255 |
| Data queue size | 32 bits (16 bits is supported as extended function.) |
| Max. number of fixed-length memorypools | 255 |
| Max. number of variable-length memorypools | 255 |
| Max. number of cyclic handler | 255 |
| Max. number of alarm handler | 255 |
| Number of service call | 133 |
| Kernel language | Assembly language, C language |
| Performance (Time takes for a target task to be executed after the wup_tas is issued.) |
8 microseconds (M32C/83, 30MHz) |
| Kernel code size | Approximately 3K to 21K bytes |
| Kernel RAM usage per task | Data: 19 bytes Stack: 12 bytes |
Components of Evaluation License Package
| Kernel library | mr308.lib |
|---|---|
| Kernel library source files | Not included. (* Included with Mass-production License Package) |
| Configurator | cfg308 |
| Utilities | mr308tbl, echo308 |
| Default configuration file | default.cfg |
| C interface library | c308mr.lib |
| C interface library source file and makefile | 25 files |
| C language include file | itron.h, kernel.h, kernel_api.h |
| Sample start-up program | [For NC308] crt0mr.a30 [For AS308] start.a30 |
| Sample Section definition file | [For NC308] c_sec.inc [For AS308] asm_sec.inc |
| System RAM area definition database file | sys_ram.inc |
| Database file for generating makefile | makefile.dos |
| Table database file | mrtable.tpl |
| Service call file for issuing service call | isssys.mrc |
| Include database file | mr308.inc |
| M3T-MR308/4 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.)
- M3T-MR308/4 kernel libraries (mr308.lib) source files
(2) No source code
- Components of Evaluation License Package
- Mass production rights (For details, see the License Agreement.)
Processing Flow