User’s Manual U11969EJ3V0UM00
275
CHAPTER 8 SERIAL INTERFACE FUNCTION
Figure 8-23 shows the communication reservation procedure.
Figure 8-23. Communication Reservation Procedure
Note Executes writing to IIC by stop condition interrupt in communication reservation operation.
(15) Other precautions
(a) Multi-master communication
To perform master communication from the status in which stop condition is not detected (bus is not
released) after reset, generate stop condition and release bus before starting master communication.
In multi-master, master communication cannot be performed in the status in which bus is not released
(stop condition is not detected).
Generate stop condition with the following procedure.
<1> Setting IICCL
<2> IICE of IICC
←
1
<3> SPT of IICC
←
1
DI
STT
←
1
Definition of
communication reservation
Wait
Cancellation of
communication reservation
IIC <- xxH
EI
STT = 1 ?
Sets STT flags
(communication reservation)
Defines communication is reserved
(set by defining user flag in any
RAM)
Secures wait time by software
(refer to Table 8-5)
Checks STT flag
Clears user flag
IIC write operation
(Communication reservation)
Note
(Generates start condition)
No
Yes
;
;
;
;
;
;
Содержание V854 UPD703006
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