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3.4 Task

This section describes how tasks are managed by MR100.

3.4.1 Task Status

The real-time OS monitors the task status to determine whether or not to execute the tasks.

Figure 3.15 shows the relationship between key input task execution control and task status. When there is a key input, the

key input tas

k must be executed. That is, the key input task is placed in the execution (RUNNING) state. While the system

waits for key input, task execution is not needed. In that situation, the key input task in the WAITING state.

Key input

Task

RUNNIG state WAITING state RUNNING state

Waiting for

key input

Key input

processing

Key input

rocessin

Figure 3.15 Task Status

The MR100 controls the following six different states including the RUNNING and WAITING states.

1. RUNNING state

2. READY state

3. WAITING state

4. SUSPENDED state

5. WAITING-SUSPENDED state

6. DORMANT state

Every task is in one of the above six different states. Figure 3.16 shows task status transition.

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Renesas M3T-MR100 Manuale Utente Pagina 35

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