SN8F5708 datasheet(154/204 Pages) SONIX

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SN8F5708 Series

I2C

Datasheet Rev. 2.4

154

22.3

General Call Address

In I2C bus, the first 7-bit is the slave address. Only the address matches slave address, the slave will

response an ACK. The exception is the general call address which can address all slave devices.

When this address occur, all devices should response an acknowledge (ACK). The general call

address is a special address which is reserved as all “0” of 7-bit address. The general call address

function is control by GC bit. Set this bit will enable general call address and clear it will disable.

When GC=1, the general call address will be recognized. When GC=0, the general call address will

be ignored.

ACK

SDA

SCL

Receiving Data

R/W=0

General Call Address

“1”

ACK

Address compare to general call address

22.4

Serial Clock Generator

In master mode, the SCL clock rate generator’s is controlled by CR[2:0] bit of I2CCON register.

When CR[2:0]=000~110, SCL clock rate is from internal clock generator.

SCL Clock Rate =

Fcpu

Prescaler

(Prescaler = 256~60)

When CR[2:0]=111, SCL clock rate is from Timer 1 overflow rate .

SCL Clock Rate =

Timer 1 Overflow

The table below shows the clock rate under different setting.

CR2

CR1

CR0

I2C

Bit Frequency (kHz)

Prescaler

6MHz

8MHz

256

224

192

160

960

6.25

120

100

133

(Timer 1 overflow rate)/8

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