Renesas 70 Manual De Usuario

   

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The task control block (TCB) refers to the data block that the real-time OS uses for individual task status, priority, 
and other control purposes. 

The MR308 manages the following task information as the task control block 

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Task connection pointer 

Task connection pointer used for ready queue formation or other purposes.   

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Task status 

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Task priority 

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Task register information and other data

  storage stack area pointer(current SP register value)   

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Wake-up counter 

Task wake-up request storage area.   

• 

Time-out counter or wait flag pattern 

When a task is in a time-out wait state, the remaining wait time is stored; if in a flag wait state, the 
flag's wait pattern is stored in this area.   

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Flag wait mode 

This is a wait mode during eventflag wait.   

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Timer queue connection pointer 

This area is used when using the timeout function. This area stores the task connection pointer used 
when constructing the timer queue. 

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Flag wait pattern 

This area is used when using the timeout function. 

This area stores the flag wait pattern when using the eventflag wait service call with the timeout func-
tion (twai_flg). No flag wait pattern area is allocated when the eventflag is not used. 

• 

Startup request counter 

This is the area in which task startup requests are accumulated. 

• 

Extended task information 

Extended task information that was set during task generation is stored in this area. 

 

The task control block is schematized in Figure 3.17

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  Called the task context