CHAPTER 11 SERIAL INTERFACE FUNCTION
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User’s Manual U15109EJ3V0UD
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STCENn
Initial start enable trigger
0
Start conditions cannot be generated until a stop condition is detected following operation enable (IICEn =
1).
1
Start conditions can be generated even if a stop condition is not detected following operation enable (IICEn
= 1).
Condition for clearing (STCENn = 0)
Condition for setting (STCENn = 1)
•
When start condition is detected
•
When RESET is input
•
Setting by instruction
IICRSVn
Communication reservation function disable bit
0
Communication reservation enabled
1
Communication reservation disabled
Condition for clearing (IICRSVn = 0)
Condition for setting (IICRSVn = 1)
•
Clearing by instruction
•
When RESET is input
•
Setting by instruction
Cautions 1. Write STCENn and IICRSVn only when operation is stopped (IICEn = 0).
2. When STCENn = 1, the bus released status (IICBSYn = 0) is recognized regardless of
the actual bus status immediately after the I
2
Cn bus operation is enabled. Therefore,
to issue the first start condition (STTn = 1), it is necessary to confirm that the bus has
been released, so as to not disturb other communications.
Remarks 1.
STTn: Bit 1 of IIC control register n (IICCn)
IICEn: Bit 7 of IIC control register n (IICCn)
2.
n = 0, 1