Datasheet

V850ES/JG3 CHAPTER 17 I
2
C BUS
R01UH0015EJ0300 Rev.3.00 Page 594 of 870
Sep 30, 2010
The communication reservation flowchart is illustrated below.
Figure 17-17. Communication Reservation Flowchart
DI
SET1 STTn
Define communication
reservation
Wait
Cancel communication
reservation
No
Yes
IICn register ← xxH
EI
MSTSn bit = 0?
(Communication reservation)
Note
(Generate start condition)
Sets STTn bit (communication reservation).
Secures wait period set by software (see Table 17-6).
Confirmation of communication reservation
Clears user flag.
IICn register write operation
Defines that communication reservation is in effect
(defines and sets user flag to any part of RAM).
Note The communication reservation operation executes a write to the IICn register when a stop
condition interrupt request occurs.
Remark n = 0 to 2