AT45DB021D-MU datasheet(14/52 Pages) ATMEL

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3638B–DFLASH–02/07

AT45DB021D [Preliminary]

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

whether sectors 0 through 7 will be protected or unprotected. The Sector Protection Register is

user modifiable and must first be erased before it can be reprogrammed. Table 9-3 illustrates the

format of the Sector Protection Register.

Note:

1. The default value for bytes 0 through 7 when shipped from Atmel® is 00H.

x = don’t care.

Table 9-2.

Sector Protection Register

Sector Number

0 (0a, 0b)

1 to 7

Protected

See Table 9-3

FFH

Unprotected

00H

Table 9-3.

Sector 0 (0a, 0b)

Bit 3, 2

Data

Value

(Page 0-7)

(Page 8-127)

Bit 7, 6

Bit 5, 4

Bit 1, 0

Sectors 0a, 0b Unprotected

0xH

Protect Sector 0a

CxH

Protect Sector 0b (Page 8-127)

3xH

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

(Page 8-127)(1)

FxH

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