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Chapter 12    Serial Interface 3

Operation

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Activation factor for Communication

Set data (at transmission) or dummy data (at reception) to the transmit/receive shift register SC3TRB.

Start condition and transfer clock are generated to start communication, regardless of transmission/

reception. This serial interface can not be used for slave communication.

IIC serial communication in single master is available at serial interface 3. Communication of this IIC

interface is based on the data transfer format of Philips, IIC-BUS.

Table 12-3-11 shows the functions of IIC serial interface.

Communication type

IIC (single master)

Interrupt

SC3IRQ

Pin

SDA, SCL

Transfer bit count

1 to 8 bit

First transfer bit 

ACK bit

ACK bit level

fosc/2

fosc/4

fosc/16

fosc/32

fs/2

fs/4

timer 5 output

The transfer rate is the clock source divided by 3.

Clock source