AT25DF321 datasheet(19/37 Pages) ATMEL

19 / 37 page

3669A–DFLASH–07/07

AT25DF321

The tables below detail the various protection and locking states of the device.

Note:

1. “n” represents a sector number

Table 9-4.

Software Protection Register States

Sector Protection Register

n(1)

Sector

n(1)

(Don't Care)

Unprotected

1Protected

Table 9-5.

Hardware and Software Locking

SPRL

Locking

SPRL Change Allowed

Sector Protection Registers

Can be modified from 0 to 1

Unlocked and modifiable using the

Protect and Unprotect Sector

commands. Global Protect and

Unprotect can also be performed.

Hardware

Locked

Locked in current state. Protect and

Unprotect Sector commands will be

ignored. Global Protect and

Unprotect cannot be performed.

Can be modified from 0 to 1

Unlocked and modifiable using the

Protect and Unprotect Sector

commands. Global Protect and

Unprotect can also be performed.

Software

Locked

Can be modified from 1 to 0

Locked in current state. Protect and

Unprotect Sector commands will be

ignored. Global Protect and

Unprotect cannot be performed.

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