USBB17RX78K4-XXX NEC Electronics, USBB17RX78K4-XXX Datasheet - Page 54

• Manufacturer Part Number: USBB17RX78K4-XXX
• Description: 78K/4 series realtime OS
• Manufacturer: NEC Electronics

4.2.4 cwai_flg (Wait and Clear Eventflag)
[Function]
[Remarks]
[System call ID number]
[Parameter]
[Return parameter]
[Assembler format]
[C format]
Waits for an event flag (with clear).
Waits until an event flag indicated by flgid is set to 1. The event flag is cleared when it has been set and the
task has been released from the WAIT state.
If “set_flg” is issued when two or more tasks are waiting for an event flag, the tasks are sequentially woken up
starting from the one placed at the top of the queue. However, the tasks following the one in the WAIT state
by “cwai_flg” cannot be woken up because the event flag is cleared.
cwai_flg = 13
flgid (Eventflag Identifier)
E_OK
[Large model]
MOV
MOVW
MOV
CALLT
C register = return parameter
ret = cwai_flg (flgid);
char
bnk0_b, #13
bnk0_up, #flgid
bnk0_d, #flgid
[40H]
:
*flgid;
CHAPTER 4
Event flag ID (Eventflag top address)
Normal termination
[Small model]
MOV
MOVW
CALLT
C register = return parameter
RX78K/IV SYSTEM CALL LIST
bnk0_b, #13
[40H]
:
bnk0_up, #flgid
- 24 bits (large model)
- 16 bits (small model)
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