Rainbow Electronics AT45DB161D - Manual (Page 13)

13
3500O–DFLASH–11/2012
AT45DB161D
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 9-1. WP Pin and Protection Status
Table 9-1. WP Pin and Protection Status
9.1 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 16-bytes of data,
of which byte locations 0 through 15 contain values that specify whether sectors 0 through 15 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.:
Table 9-2. Sector Protection Register
Table 9-3. Sector 0 (0a, 0b)
Note: 1. The default value for bytes 0 through 15 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
Register
1 High
Command Not Issued Previously
–
Issue Command
X
Issue Command
–
Disabled
Disabled
Enabled
Read/Write
Read/Write
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
Read/Write
Read/Write
WP
1 2 3
Sector Number 0 (0a, 0b) 1 to 15
Protected
See Table 9-3
FFH
Unprotected 00H
0a 0b
Bit 3, 2
Data
Value
(Page 0-7) (Page 8-255)
Bit 7, 6 Bit 5, 4 Bit 1, 0
Sectors 0a, 0b Unprotected 00 00 xx xx 0xH
Protect Sector 0a 11 00 xx xx CxH
Protect Sector 0b (Page 8-255) 00 11 xx xx 3xH
Protect Sectors 0a (Page 0-7), 0b (Page 8-255) (1) 11 11 xx xx FxH