Rainbow-electronics AT45DB021D Manual de usuario descargar pdf (Pagina 12)

3638K–DFLASH–11/2012

AT45DB021D

The table below details the sector protection status for various scenarios of the WP pin, the Enable Sector

Protection command, and the Disable Sector Protection command.

Figure 7-1.

WP Pin and Protection Status

Table 7-1.

WP Pin and Protection Status

7.1 Sector Protection Register

The nonvolatile Sector Protection Register specifies which sectors are to be protected or unprotected with either

the software or hardware controlled protection methods. The Sector Protection Register contains 8-bytes of data,

of which byte locations zero through seven contain values that specify whether sectors zero through seven will be

protected or unprotected. The Sector Protection Register is user modifiable and must first be erased before it can

be reprogrammed. Table 7-3 illustrates the format of the Sector Protection Register

Table 7-2. Sector Protection Register.

Table 7-3. Sector 0 (0a, 0b)

Note: 1. The default value for bytes 0 through 7 when shipped from Adesto is 00H

x = don’t care

Time

Period

WP Pin

Enable Sector Protection

Command

Disable Sector

Protection Command

Sector

Protection Status

Sector

Protection

1 High

Command Not Issued Previously

–

Issue Command

–

Disabled

Enabled

Read/Write

2 Low X X Enabled Read Only

3 High

Command Issued During Period 1

or 2

–

Issue Command

Not Issued Yet

Issue Command

–

Enabled

Disabled

Enabled

Read/Write

Sector Number 0 (0a, 0b) 1 to 7

Protected

See Table 7-3

FFH

Unprotected 00H

0a 0b

Bit3,2

Data

Value

(Page 0-7) (Page 8-127)

Bit7,6 Bit5,4 Bit1,0

Sectors 0a, 0b Unprotected 00 00 xx xx 0xH

Protect Sector 0a 11 00 xx xx CxH

Protect Sector 0b (Page 8-127) 00 11 xx xx 3xH

Protect Sectors 0a (Page 0-7), 0b (Page 8-127)

(1)

11 11 xx xx FxH

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 47 48

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