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CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
423
11.5.13 Cautions
(1) When STCENn of IIC flag register n (IICFn) = 0
Immediately after the I
2
Cn operation is enabled, the bus communication status (IICBSYn of IICFn register = 1) is
recognized regardless of the actual bus status. To execute master communication in the status where a stop
condition has not been detected, generate a stop condition and then release the bus before starting the master
communication.
Use the following sequence for generating a stop condition.
<1> Set IIC clock select register n (IICCLn).
<2> Set IICEn of the IIC control register n (IICCn).
<3> Set SPTn of IICCn.
(2) When STCENn of IIC flag register n (IICFn) = 1
Immediately after I
2
Cn operation is enabled, the bus released status (IICBSYn of IICFn register = 0) is
recognized regardless of the actual bus status. To issue the first start condition (STTn of IICCn register = 1), it is
necessary to confirm that the bus has been released, so as to not disturb other communications.
Remark
n = 0, 1