AK93C41A Datasheet, PDF (4/12 Pages) Asahi Kasei Microsystems – 0.9V operation 1K / 2Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK93C41A/51A]
Functional Description
The AK93C41A/51A 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
READ
1
WRITE
1
EWEN
1
EWDS
1
WRAL
1
Op
Code
10
01
00
00
00
Address
A5-A0
A5-A0
11XXXX
00XXXX
01XXXX
Data
D15-D0
D15-D0
D15-D0
Comments
Reads data stored in memory, at specified address.
Writes register.
Write enable must precede all programming modes.
Disables all programming instructions.
Writes all registers.
table1. Instruction Set for the AK93C41A
Instruction Start
Bit
READ
1
WRITE
1
EWEN
1
EWDS
1
WRAL
1
Op
Code
10
01
00
00
00
Address
X A6-A0
X A6-A0
11XXXXXX
00XXXXXX
01XXXXXX
Data
D15-D0
D15-D0
D15-D0
Comments
Reads data stored in memory, at specified address.
Writes register.
Write enable must precede all programming modes.
Disables all programming instructions.
Writes all registers.
table2. Instruction Set for the AK93C51A
(Note) ^• The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
• _{The AK93C41A/51A perceives the start bit in the logic"1" and also "01".}
DAM05E-01
-4-
1999/12