AT88SC1608 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT88SC1608

8 x 256 x 8 Secure Memory with Authentication

Atmel Corporation 

AT88SC1608

The password and authentication may be presented at any time and in any order. If the

trials limit has been reached, i.e., the 8 bits of the attempts counter have been written,

the password verification or authentication process will not be taken into account.

Command Definitions and Protocols

Table 5. Device Commands

Description

Write User Zone

Read User Zone

Write Configuration Zone

Read Configuration Zone

Set User Zone Address

Verify Password

Initialize Authentication

Verify Authentication

The communications protocol is based on the popular two-wire serial interface. Note

that the most significant bit is transmitted first.

Command

Code HEX

Chip Select

Instruction

b7

b6

b5

b4

b3

b2

b1

b0

$B0

1

0

1

1

0

0

0

0

$B1

1

0

1

1

0

0

0

1

$B4

1

0

1

1

0

1

0

0

$B5

1

0

1

1

0

1

0

1

$B2

1

0

1

1

0

0

1

0

$B3

1

0

1

1

0

0

1

1

$B6

1

0

1

1

0

1

1

0

$B7

1

0

1

1

0

1

1

1

Set User Zone Address

Figure 4. Set User Zone Address

S

T

A

R

T Command

S

T

O

Fuses Index

P

* * * * * A10 A9 A8

A

A

C

C

K

K

Note: * = Don’t care bit

At power-on, no access to the user zones is allowed until the Set User Zone Address

command occurs. This command sets the three most significant bits of the byte

address, corresponding to the user zone address. This address stays valid until the host

sends a new one and as long as the chip is powered.

9

0971G–SMEM–04/04

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