M3T-MR30/4 Real-time OS for M16C Series and R8C Family

• 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.
• 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) .

• 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-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.
• 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 recieving a message.
  • Data queue
    Tasks are synchronized by communicating 2-byte data.
• 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.
   

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