AT93C46/56/57/66
Instruction Set for the AT93C46
Address
Data
Op
Instruction
SB
Code
x 8
x 16
x 8
x 16
Comments
READ
1
10
00
A6 - A0
A5 - A0
Reads data stored in memory, at
specified address.
EWEN
1
11XXXXX
11XXXX
Write enable must precede all
programming modes.
ERASE
WRITE
ERAL
1
1
1
11
01
00
A6 - A0
A6 - A0
A5 - A0
A5 - A0
Erase memory location An - A0.
Writes memory location An - A0.
D7 - D0
D7 - D0
D15 - D0
10XXXXX
10XXXX
Erases all memory locations. Valid
only at VCC = 4.5V to 5.5V.
WRAL
EWDS
1
1
00
00
01XXXXX
00XXXXX
01XXXX
00XXXX
D15 - D0
Writes all memory locations. Valid
only at VCC = 4.5V to 5.5V.
Disables all programming instructions.
Instruction Set for the AT93C57
Address
Data
Op
Instruction
SB
Code
x 8
x 16
x 8
x 16
Comments
READ
1
10
A7 - A0
A6 - A0
Reads data stored in memory, at
specified address.
EWEN
1
00
11XXXXXX
11XXXXX
Write enable must precede all
programming modes.
ERASE
WRITE
ERAL
1
1
1
11
01
00
A7 - A0
A7 - A0
A6 - A0
A6 - A0
Erase memory location An - A0.
Writes memory location An - A0.
D7 - D0
D7 - D0
D15 - D0
10XXXXXX
10XXXXX
Erases all memory locations. Valid
only at VCC = 4.5V to 5.5V.
WRAL
EWDS
1
1
00
00
01XXXXXX
00XXXXXX
01XXXXX
00XXXXX
D15 - D0
Writes all memory locations. Valid
only at VCC = 4.5V to 5.5V.
Disables all programming instructions.
5
ATMEL [ ATMEL ]
