X9250

Characteristics subject to change without notice.

8 of 21

REV 1.1.5 1/31/03

www.xicor.com

Instruction Format

Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.

(2) WPx refers to wiper position data in the Counter Register

(2) “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).

(3) “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).

Read Wiper Counter Register(WCR)

Write Wiper Counter Register (WCR)

Read Data Register (DR)

Write Data Register (DR)

Transfer Data Register (DR) to Wiper Counter Register (WCR)

CS

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

WCR

addresses

wiper position

(sent by X9250 on SO)

CS

Rising

Edge

010100

A

1

A

0

100100

P

1

P

0

W

P

7

W

P

6

W

P

5

W

P

4

W

P

3

W

P

2

W

P

1

W

P

0

CS

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

WCR

addresses

Data Byte

(sent by Host on SI)

CS

Rising

Edge

010100

A

1

A

0

101000

P

1

P

0

W

P

7

W

P

6

W

P

5

W

P

4

W

P

3

W

P

2

W

P

1

W

P

0

CS

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Data Byte

(sent by X9250 on SO)

CS

Rising

Edge

010100

A

1

A

0

1011

R

1

R

0

P

1

P

0

W

P

7

W

P

6

W

P

5

W

P

4

W

P

3

W

P

2

W

P

1

W

P

0

CS

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Data Byte

(sent by host on SI)

CS

Rising

Edge

HIGH-VOLTAGE

WRITE CYCLE

010100

A

1

A

0

1100

R

1

R

0

P

1

P

0

W

P

7

W

P

6

W

P

5

W

P

4

W

P

3

W

P

2

W

P

1

W

P

0

CS

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

CS

Rising

Edge

010100

A

1

A

0

1101

R

1

R

0

P

1

P

0