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3.4.4 Task Control Block(TCB)
The task control block (TCB) refers to the data block that the real-time OS uses for individual task status, priority, and oth-
er control purposes.
The MR100 manages the following task information as the task control block
• Task connection pointer
Task connection pointer used for ready queue formation or other purposes.
• Task status
• Task priority
• Task register information and other data
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storage stack area pointer(current SP value)
• Wake-up counter
Task wake-up request storage area.
• Flag wait mode
This is a wait mode during eventflag wait.
• Flag wait pattern
This area stores the flag wait pattern when using the eventflag wait service call (wai_flg, 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.
The task control block is schematized in Figure 3.20.
TCB TCB
TCB
Task Connection pointer
Status
Priority
Wake-up counter
Flag wait mode
Flag wait pattern
A
ctivation counter
This area is allocated only when
the timeout function is used.
SP
Figure 3.20 Task control block
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Called the task context