at45db021d-ssh-sl955 ATMEL Corporation, at45db021d-ssh-sl955 Datasheet - Page 14

• Manufacturer Part Number: at45db021d-ssh-sl955
• Description: 2-megabit 2.7-volt Minimum Dataflash
• Manufacturer: ATMEL Corporation

9.1
14
Sector Protection Register
AT45DB021D
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
Register contains 8 bytes of data, of which byte locations 0 through 7 contain values that specify
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.
format of the Sector Protection Register.
Table 9-2.
Table 9-3.
Note:
Sector Number
Protected
Unprotected
Sectors 0a, 0b Unprotected
Protect Sector 0a
Protect Sector 0b (Page 8-127)
Protect Sectors 0a (Page 0-7), 0b
(Page 8-127)
1. The default value for bytes 0 through 7 when shipped from Atmel
x = don’t care.
(1)
Sector Protection Register
Sector 0 (0a, 0b)
(Page 0-7)
Bit 7, 6
0a
00
11
00
11
See
0 (0a, 0b)
Table 9-3
(Page 8-127)
Bit 5, 4
0b
00
00
11
11
Bit 3, 2
xx
xx
xx
xx
®
is 00H.
Table 9-3
Bit 1, 0
1 to 7
xx
xx
xx
xx
FFH
3638F–DFLASH–4/08
00H
illustrates the
Value
Data
CxH
FxH
0xH
3xH