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17.16.2 Master operation 2
The following shows the flowchart for master communication when the communication reservation function is
disabled (IICRSVn bit = 1) and the master operation is started without detecting a stop condition (STCENn bit = 1).
IICEn = SPIEn = WTIMn = 1
Start IICn write transfer
Start IICn write transfer
Remark
n = 0 to 2
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CHAPTER 17 I
Figure 17-19. Master Operation Flowchart (2)
START
←
××H
IICCLn
Transfer clock selection
←
××H
IICFn
IICFn register setting
←
××H
IICCn
IICCn register initial setting
No
IICBSYn = 0?
Yes
STTn = 1
Wait time is secured by software
Insert wait
(see Table 17-7)
No
STCFn = 0?
Yes
No
INTIICn = 1?
Yes (address transfer completion)
No (receive)
ACKDn = 1?
Yes
TRCn = 1?
WTIMn = 0
Yes (transmit)
ACKEn = 1
WRELn = 1
Start reception
No
INTIICn = 1?
Yes
INTIICn = 1?
Data processing
Data processing
No
ACKDn = 1?
Yes
Reception completed?
ACKEn = 0
No
Transfer completed?
(restart)
SPTn = 1
Generate stop condition
End
Preliminary User's Manual U16541EJ1V0UM
2
C BUS
Master communication is
Stop master communication
stopped because bus is occupied
Generate stop condition
(no slave with matching address)
End
No
Yes
No
Yes
Yes
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