Nxp Semiconductors UM10237 用户手册

UM10237_2

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If the AA bit is reset during a transfer, the I

2

C block will return a not acknowledge (logic 1) 

to SDA after the next received data byte. While AA is reset, the I

2

C block does not 

respond to its own slave address or a general call address. However, the I

2

C bus is still 

monitored and address recognition may be resumed at any time by setting AA. This 
means that the AA bit may be used to temporarily isolate the I

2

C block from the I

2

C bus.