AT45DB321D ATMEL [ATMEL Corporation], AT45DB321D Datasheet - Page 14

• Manufacturer Part Number: AT45DB321D
• Description: 32-megabit 2.7-volt DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

9.1
14
Sector Protection Register
AT45DB321D
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 64 bytes of data, of which byte locations 0 through 63 contain values that
specify whether sectors 0 through 63 will be protected or unprotected. The Sector Protection
Register is user modifiable and must first be erased before it can be reprogrammed.
illustrates the format of the Sector Protection Register.:
Table 9-2.
Table 9-3.
Note:
Sector Number
Protected
Unprotected
Sectors 0a, 0b Unprotected
Protect Sector 0a (Pages 0-7)
Protect Sector 0b (Pages 8-127)
Protect Sectors 0a (Pages 0-7), 0b
(Pages 8-127)
1. The default value for bytes 0 through 63 when shipped from Atmel is 00H.
x = don’t care.
(1)
Sector Protection Register
Sector 0 (0a, 0b)
(Pages 0-7)
Bit 7, 6
0a
00
11
00
11
See
0 (0a, 0b)
Table 9-3
(Pages 8-127)
Bit 5, 4
0b
00
00
11
11
Bit 3, 2
xx
xx
xx
xx
Bit 1, 0
1 to 63
xx
xx
xx
xx
FFH
00H
3597J–DFLASH–4/08
Table 9-3
Value
Data
CxH
FxH
0xH
3xH