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
Address
A5-A0
Data
Comments
Code
READ
WRITE
EWEN
EWDS
WRAL
1
1
1
1
1
10
D15-D0
D15-D0
Reads data stored in memory, at specified address.
Writes register.
01
00
00
00
A5-A0
11XXXX
00XXXX
01XXXX
Write enable must precede all programming modes.
Disables all programming instructions.
D15-D0
Writes all registers.
X: Don't care
table 1. Instruction Set for the AK93C45A
Instruction Start
Bit
Op
Code
10
Address
Data
Comments
READ
WRITE
EWEN
EWDS
WRAL
1
1
1
1
1
X A6-A0
D15-D0
D15-D0
Reads data stored in memory, at specified address.
Writes register.
01
00
00
00
X A6-A0
11XXXXXX
00XXXXXX
01XXXXXX
Write enable must precede all programming modes.
Disables all programming instructions.
D15-D0
Writes all registers.
X: Don't care
table 2. Instruction Set for the AK93C55A
Instruction Start
Bit
Op
Code
10
Address
Data
Comments
READ
WRITE
EWEN
EWDS
WRAL
1
1
1
1
1
A7-A0
D15-D0
D15-D0
Reads data stored in memory, at specified address.
Writes register.
01
00
00
00
A7-A0
11XXXXXX
00XXXXXX
01XXXXXX
Write enable must precede all programming modes.
Disables all programming instructions.
D15-D0
Writes all registers.
X: Don't care
table 3. Instruction Set for the AK93C65A
Instruction Start
Bit
Op
Code
10
Address
Data
Comments
READ
WRITE
EWEN
EWDS
WRAL
1
1
1
1
1
XA8-A0
D15-D0
D15-D0
Reads data stored in memory, at specified address.
Writes register.
01
00
00
00
XA8-A0
11XXXXXXXX
00XXXXXXXX
Write enable must precede all programming modes.
Disables all programming instructions.
01XXXXXXXX D15-D0
Writes all registers.
X: Don't care
table 4. Instruction Set for the AK93C75A
(Note) The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
The AK93C45A/55A/65A/75A perceives the start bit in the logic"1" and also "01".
DAM01E-01
1999/10
- 5 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
