AK93C85A_04 Datasheet, PDF (4/13 Pages) Asahi Kasei Microsystems – 16K / 32K / 64Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK93C85A/95A/10A]
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 Start Op
on
Bit Code
READ 01 10
WRITE 01 01
EWEN 01 00
EWDS 01 00
WRAL 01 00
Address
Data
Comments
A9-A0
D15-D0 Reads data stored in memory, at specified address.
A9-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
table1. Instruction Set for the AK93C85A
Instructi Start Op
on
Bit Code
READ 1 10
WRITE 1 01
EWEN 1 00
EWDS 1 00
WRAL 1 00
Address
Data
Comments
A10-A0
D15-D0 Reads data stored in memory, at specified address.
A10-A0
D15-D0 Writes register.
11XXXXXXXXX
Write enable must precede all programming modes.
00XXXXXXXXX
Disables all programming instructions.
01XXXXXXXXX D15-D0 Writes all registers.
X: Don't care
table2. Instruction Set for the AK93C95A
Instructi
on
READ
WRITE
EWEN
EWDS
WRAL
Start Op
Bit Code
1 10
1 01
1 00
1 00
1 00
Address
Data
Comments
A11-A0
D15-D0 Reads data stored in memory, at specified address.
A11-A0
D15-D0 Writes register.
11XXXXXXXXXX
Write enable must precede all programming modes.
00XXXXXXXXXX
Disables all programming instructions.
01XXXXXXXXXX D15-D0 Writes all registers.
X: Don't care
table3. Instruction Set for the AK93C10A
(Note) x The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
x The AK93C85A perceives the start bit in the logic"01" and also "001".
x The AK93C95A/10A perceives the start bit in the logic"1" and also "01".
DAM02E-03
-4-
2004/05