ASAHI KASEI

[AK93C85A/95A/10A]

DAM02E-03

2004/05

- 4 -

Functional Description

The AK93C85A/95A/10A has 4 instructions such as READ, WRITE, EWEN and EWDS.

A valid

instruction consists of a Start Bit (Logic"1"), the appropriate Op Code and the desired memory

Address location.

The CS pin must be brought low for a minimum of 250ns (tCS) between each instruction when the

instruction is continuously executed.

Instructi

on

Start

Bit

Op

Code

Address

Data

Comments

READ

01

10

A9-A0

D15-D0

Reads data stored in memory, at specified address.

WRITE

01

01

A9-A0

D15-D0

Writes register.

EWEN

01

00

11XXXXXXXX

Write enable must precede all programming modes.

EWDS

01

00

00XXXXXXXX

Disables all programming instructions.

WRAL

01

00

01XXXXXXXX

D15-D0

Writes all registers.

X: Don't care

table1. Instruction Set for the AK93C85A

Instructi

on

Start

Bit

Op

Code

Address

Data

Comments

READ

1

10

A10-A0

D15-D0

Reads data stored in memory, at specified address.

WRITE

1

01

A10-A0

D15-D0

Writes register.

EWEN

1

00

11XXXXXXXXX

Write enable must precede all programming modes.

EWDS

1

00

00XXXXXXXXX

Disables all programming instructions.

WRAL

1

00

01XXXXXXXXX

D15-D0

Writes all registers.

X: Don't care

table2. Instruction Set for the AK93C95A

Instructi

on

Start

Bit

Op

Code

Address

Data

Comments

READ

1

10

A11-A0

D15-D0

Reads data stored in memory, at specified address.

WRITE

1

01

A11-A0

D15-D0

Writes register.

EWEN

1

00

11XXXXXXXXXX

Write enable must precede all programming modes.

EWDS

1

00

00XXXXXXXXXX

Disables all programming instructions.

WRAL

1

00

01XXXXXXXXXX

D15-D0

Writes all registers.

X: Don't care

table3. Instruction Set for the AK93C10A

(Note)

The WRAL instruction are used for factory function test only.

User can't use the WRAL instruction.

The AK93C85A perceives the start bit in the logic"01" and also "001".

The AK93C95A/10A perceives the start bit in the logic"1" and also "01".