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Overview
Chapter 12 Serial Interface 3
Table 12-1-1 Serial Interface 3 Functions List
12-1 Overview
This LSI contains a serial interface 3 can be used for both communication types of clock synchronous and
simple IIC (single master).
12-1-1 Functions
Table 12-1-1 shows the functions of serial interface 3.
Communication type Clcok synchronous IIC (single master)
Interrupt SC3IRQ SC3IRQ
Pin SBO3, SBI3, SBT3 SDA, SCL
3 channels type -
2 channels type (SBO3, SBT3)
Start condition
Transfer bit count 1 to 8 bit 1 to 8 bit
First transfer bit
Input edge / Output edge -
ACK bit -
ACK bit level -
Continuous operation (with ATC1) -
fosc/2 fosc/2
fosc/4 fosc/4
fosc/16 fosc/16
fosc/32 fosc/32
fs/2 fs/2
fs/4 fs/4
timer 5 output timer 5 output
external clock external clock
Maximum transfer rate 2.5 MHz 400 kHz
Clock source
fosc : machine clock (high speed oscillation)
fs : system clock [ Chapter 2 2-5. Clock Switching ]
At IIC communication, the transfer clock is the clock source divided by 3.