IFIIC60B_010020040200 Rev. 1.00, 05/04, page 277 of 544
Section 13 I2C Bus Interface (IIC)
This LSI has a two-channel I2C bus interface. The I2C bus interface conforms to and provides a
subset of the Philips I2C bus (inter-IC bus) interface functions. The register configuration that
controls the I2C bus differs partly from the Philips configuration, however.
13.1 Features
• Selection of addressing format or non-addressing format
I2C bus format: addressing format with an acknowledge bit, for master/slave operation
Clocked synchronous serial format: non-addressing format without an acknowledge bit, for
master operation only
• Conforms to Philips I2C bus interface (I2C bus format)
• Two ways of setting slave address (I2C bus format)
• Start and stop conditions generated automatically in master mode (I2C bus format)
• Selection of the acknowledge output level in reception (I2C bus format)
• Automatic loading of an acknowledge bit in transmission (I2C bus format)
• Wait function in master mode (I2C bus format)
A wait can be inserted by driving the SCL pin low after data transfer, excluding
acknowledgement.
The wait can be cleared by clearing the interrupt flag.
• Wait function (I2C bus format)
A wait request can be generated by driving the SCL pin low after data transfer.
The wait request is cleared when the next transfer becomes possible.
• Interrupt sources
Data transfer end ( including when a transition to transmit mode with I2C bus format occurs,
when ICDR data is transferred, or during a wait state)
Address match: When any slave address matches or the general call address is received in
slave receive mode with I2C bus format (including address reception after loss of master
arbitration)
Start condition detection (in master mode)
Stop condition detection (in slave mode)
• Selection of 16 internal clocks (in master mode)
• Direct bus drive (SCL/SDA pin)
Eight pins—P52/SCL0, P97/SDA0, P86/SCL1, P42/SDA1, PG4/ExSDAA, PG5/ExSCLA,
PG6/ExSDAB, and PG7/ExSCLB—(normally NMOS push-pull outputs) function as
NMOS open-drain outputs when the bus drive function is selected.