5

AT93C46/56/66

0172Z–SEEPR–9/05

Note:

The Xs in the address field represent DON’T CARE values and must be clocked.

Notes:

1. This device is not recommended for new designs. Please refer to AT93C56A.

2. This device is not recommended for new designs. Please refer to AT93C66A.

Table 5. Instruction Set for the AT93C46

Instruction

SB

Op

Code

Address

Data

Comments

x 8

x 16

x 8

x 16

READ

1

10

Reads data stored in memory, at

specified address

EWEN

1

00

11XXXXX

11XXXX

Write enable must precede all

programming modes

ERASE

1

11

WRITE

1

01

ERAL

1

00

10XXXXX

10XXXX

Erases all memory locations. Valid

WRAL

1

00

01XXXXX

01XXXX

Writes all memory locations. Valid

only at V

EWDS

1

00

00XXXXX

00XXXX

Disables all programming instructions

Table 6. Instruction Set for the AT93C56

Instruction

SB

Op

Code

Address

Data

Comments

x 8

x 16

x 8

x 16

READ

1

10

Reads data stored in memory, at

specified address

EWEN

1

00

11XXXXXXX

11XXXXXX

Write enable must precede all

programming modes

ERASE

1

11

WRITE

1

01

A

A

D

D

Writes memory location A

ERAL

1

00

10XXXXXXX

10XXXXXX

Erases all memory locations. Valid

WRAL

1

00

01XXXXXXX

01XXXXXX

D

D

Writes all memory locations. Valid

only at V

Register cleared

EWDS

1

00

00XXXXXXX

00XXXXXX

Disables all programming instructions