M64894FP/GP

Rev.2.00 Jun 14, 2006 page 7 of 12

Method of Setting Data

The input information to consist of 2 or data of 4 bytes to lead to chip address is received in I

definition of bus protocol admitted in the following.

1_STA

CA

CB

BB

STO

2_STA

CA

D1

D2

STO

3_STA

CA

CB

BB

D1

D2

STO

4_STA

CA

D1

D2

CB

BB

STO

STA : Start condition

STO : Stop condition

CA : Chip address

CB : Control data byte

BB : Band SW data byte

D1

: Divider data byte

D2

: Divider data byte

The information of 5 bytes necessary for circuit operation is chip address and control data, band SW data of 2 bytes and

divider byte of 2 bytes. After the chip address input, 2 or data of 4 bytes are received.

Function bit is contained the first and the third data byte to distinguish between divider data and control data, band data,

and “0” goes ahead of divider data, and “1” goes ahead of control data, band SW data.

S

1-7

SCL

SDA

Address

CA

1-7

Data

Data

1-7

89

0ACK

STA

P

STO

89

ACK

89

ACK

Write Mode Format

Byte

MSB

LSB

Address byte

1

1

0

0

0

MA1

MA0

0

A

Divider byte 1

0

N14

N13

N12

N11

N10

N9

N8

A

Divider byte 2

N7

N6

N5

N4

N3

N2

N1

N0

A

Control byte1

1

CP

T2

T1

T0

RSa

RSb

OS

A

Band SW byte

X

X

X

X

BS4

BS3

BS2

BS1

A

Read Mode Format

Byte

MSB

LSB

Address byte

1

1

0

0

0

MA1

MA0

1

A

Status byte 1

POR

FL

X

X

X

A2

A1

A0

A