This product is a real-time operating system (RTOS) conforming to the μITRON 4.0-specification, the predominant RTOS for embedded systems in Japan. Its compact resources, outstanding real-time features, and many service calls are suited for an embedded system with real-time ability and multi-tasking functions. In addition, its affinity for the Renesas C compiler package and the configurator which automatically generates startup files or makefile will help you greatly reduce development time and get to market faster.
- TRON Forum holds the copyright on the μITRON Specification.
- TRON, ITRON, and μITRON do not refer to any specific product or products.
- Conforms to industry standard μITRON 4.0 specifications
The μITRON arranges and standardizes the ITRON specifications for embedded systems. M3T-MR30/4 conforms to the μITRON 4.0 specifications, and provides service calls suitable for M16C/60, 50, 30, 20, 10, M16C/Tiny Series and R8C Family MCU functions.
- Compact size for ROM
The M3T-MR30/4 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.
- Fast interrupt response
For application requiring fast interrupt response time, M3T-MR30/4 is designed to realize fast response to an interrupt which does not issue a system call.
- C and Assembly user interfaces
Using the C compiler M3T-NC30WA and the assembler AS30 for M16C/60, 50, 30, 20, 10, Tiny Series and R8C Family provides the following functions :
- Kernel direct call (for NC30)
The M3T-MR30/4 kernel can be called without the C interface library. This function reduces code size and speeds up execution time.
*Some service calls uses C language interface.
- Simplified coding tasks and handlers (for NC30)
Start functions of a task or handler can be specified in the C source file, allowing start and termination processing optimization.
- Context selection function (for AS30)
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.
- Kernel direct call (for NC30)
- Integrated development environment High-performance Embedded Workshop supported
From the Renesas integrated development environment "High-performance Embedded Workshop" (included in M3T-NC30WA) screen, OS-embedded applications can be developed using common operations of the Renesas MCU toolchain.
- Easy configuration on GUI
Using the combination of GUI configurator and cfg30 configurator based command line lets you automatically generate makefiles or start-up programs that rely on development products by just creating a simple definition file (configuration file). This enables you to install the necessary libraries without omission so you can easily and reliably process parts specially suited to the product.
The M3T-MR30/4 kernel consists of the following modules. Each module is provided by functions (service calls) .
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-MR30/4 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.
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.
Tasks are synchronized by the semaphore counter value managed by the kernel.
- Mail box
Tasks are synchronized by sending or recieving a message.
- Data queue
Tasks are synchronized by communicating 2-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.
|Target MCU||M16C/60, M16C/50, M16C/30, M16C/20, M16C/10, M16C/Tiny Series, 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 mail boxes||255|
|Max. number of data queue||255|
|Data queue size||16 bits (32 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|
(Time takes for a target task to be executed after the wup_tas is issued.)
|30 microseconds (M16C/60, 10MHz, embedded memory)|
|Kernel code size||Approximately 3K to 21K bytes|
|Kernel RAM usage per task||Data: 11 bytes
Stack: 8 bytes
Components of Evaluation License Package
|Kernel library source files||Not included.
(* Included with Mass-production License Package)
|Default configuration file||default.cfg|
|C interface library||c30mr.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 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|
|Database file for generating makefile||makefile.dos|
|Table database file||mrtable.tpl|
|Service call file for issuing service call||isssys.mrc|
|Include database file||mr30.inc|
|M3T-MR30/4 version file||version|
|Sample program||demo.c, smp.cfg|
The automatic routine setup function for initializing timer does not support the following MCUs.
- R8C Family
- M16C/60 Series : M16C/63 Group, M16C/64 Group, M16C/64A Group, M16C/65 Group
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