AK93C45A Datasheet, PDF (4/14 Pages) Asahi Kasei Microsystems – 1K / 2K / 4K / 8KBIT SERIAL CMOS EEPROM

ASAHI KASEI
[AK93C45A/55A/65A/75A]
Functional Description
The AK93C45A/55A/65A/75A 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.
Instruction
Start
Bit
Op
Code
READ
1 10
WRITE
1 01
EWEN
1 00
EWDS
1 00
WRAL
1 00
Address
Data
Comments
A5-A0
D15-D0 Reads data stored in memory, at specified address.
A5-A0
D15-D0 Writes register.
11XXXX
Write enable must precede all programming modes.
00XXXX
Disables all programming instructions.
01XXXX
D15-D0 Writes all registers.
X: Don't care
table1. Instruction Set for the AK93C45A
Instruction
Start
Bit
Op
Code
READ
1 10
WRITE
1 01
EWEN
1 00
EWDS
1 00
WRAL
1 00
Address
Data
Comments
X A6-A0
D15-D0 Reads data stored in memory, at specified address.
X A6-A0
D15-D0 Writes register.
11XXXXXX
Write enable must precede all programming modes.
00XXXXXX
Disables all programming instructions.
01XXXXXX D15-D0 Writes all registers.
X: Don't care
table2. Instruction Set for the AK93C55A
Instruction
Start
Bit
Op
Code
READ
1 10
WRITE
1 01
EWEN
1 00
EWDS
1 00
WRAL
1 00
Address
Data
Comments
A7-A0
D15-D0 Reads data stored in memory, at specified address.
A7-A0
D15-D0 Writes register.
11XXXXXX
Write enable must precede all programming modes.
00XXXXXX
Disables all programming instructions.
01XXXXXX D15-D0 Writes all registers.
X: Don't care
table3. Instruction Set for the AK93C65A
Instruction
Start
Bit
Op
Code
READ
1 10
WRITE
1 01
EWEN
1 00
EWDS
1 00
WRAL
1 00
Address
Data
Comments
X A8-A0
D15-D0 Reads data stored in memory, at specified address.
X A8-A0
D15-D0 Writes register.
11XXXXXXXX
Write enable must precede all programming modes.
00XXXXXXXX
Disables all programming instructions.
01XXXXXXXX D15-D0 Writes all registers.
X: Don't care
table4. Instruction Set for the AK93C75A
(Note) x The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
x The AK93C45A/55A/65A/75A perceives the start bit in the logic"1" and also "01".
DAM01E-02
-4-
2002/06