AT45DB321D datasheet(14/57 Pages) ATMEL

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3597N–DFLASH–04/09

AT45DB321D

9.1

Sector Protection Register

The nonvolatile Sector Protection Register specifies which sectors are to be protected or unpro-

tected with either the software or hardware controlled protection methods. The Sector Protection

specify whether sectors 0 through 63 will be protected or unprotected. The Sector Protection

illustrates the format of the Sector Protection Register.:

Note:

1. The default value for bytes 0 through 63 when shipped from Atmel is 00H.

x = don’t care.

Table 9-2.

Sector Protection Register

Sector Number

0 (0a, 0b)

1 to 63

Protected

See Table 9-3

FFH

Unprotected

00H

Table 9-3.

Sector 0 (0a, 0b)

Bit 3, 2

Data

Value

(Pages 0-7)

(Pages 8-127)

Bit 7, 6

Bit 5, 4

Bit 1, 0

Sectors 0a, 0b Unprotected

0xH

Protect Sector 0a (Pages 0-7)

CxH

Protect Sector 0b (Pages 8-127)

3xH

Protect Sectors 0a (Pages 0-7), 0b

(Pages 8-127)(1)

FxH

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