Renesas 70 Benutzerhandbuch

   

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Forced 
termination 
request 
from other 

task 

SUSPENDED state clear
request from other task 

SUSPEND request
from other task 

READY state

RUNNING state 

WAITING state

WAITING-SUSPENDED 

state 

DORMANT 

state 

SUSPENDED 

state 

WAITING

state 

clear 

t

SUSPEND request
from other task 

SUSPENDED state
clear request 

MPU execlusive right relinquishment

MPU execlusive right acquisition

Entering the
WAITING state 

Task activation 

Forced termination 
request from other task

 
WAITING state 

l

 

In this state, the task is being executed. Since only one microcomputer is used, it is natural that only 
one task is being executed. 

The currently executed task changes into a different state when any of the following conditions occurs. 

♦  The task has normally terminated itself.

♦  The task has placed itself in the WAITING state.

♦  Due to interruption or other event occurrence, the interrupt handler has placed a different task 

having a higher priority in the READY state.   

♦  The priority assigned to the task has been changed so that the priority of another READY task is 

rendered higher.

♦  Due to interruption or other event occurrence, the priority of the task or a different READY task 

has been changed so that the priority of the different task is rendered higher.

♦  When the ready queue of the issuing task priority is rotated by the rot_rdq or irot_rdq service call 

and control of execution is thereby abandoned 

 

When any of the above conditions occurs, rescheduling takes place so that the task having the highest 
priority among those in the RUNNING or READY state is placed in the RUNNING state, and the exe-
cution of that task starts. 

The READY state refers to the situation in which the task that meets the task execution conditions is 
still waiting for execution because a different task having a higher priority is currently being executed. 

When any of the following conditions occurs, the READY task that can be executed second according 

                                                      

9

  Depends on the ext_tsk service call. 

10

  Depends on the dly_tsk, slp_tsk, tslp_tsk, wai_flg, twai_flg, wai_sem, twai_sem, rcv_mbx, trcv_mbx,snd_dtq,tsnd_dtq,rcv_dtq, trcv_dtq, 

vtsnd_dtq, vsnd_dtq,vtrcv_dtq,tget_mpf, get_mpf or vrcv_dtq service call. 

11

  Depends on the chg_pri service call. 

12

  Depends on the ichg_pri service call.