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AT45DB011D-SH-SL954 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part # AT45DB011D-SH-SL954
Description  1-megabit 2.7-volt Minimum DataFlash
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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AT45DB011D-SH-SL954 Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers

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3639J–DFLASH–11/2012
AT45DB011D
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
Register contains 4-bytes of data, of which byte locations 0 through 3 contain values that specify
whether sectors 0 through 3 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 3 when shipped from Adesto is 00H.
x = don’t care.
Table 9-1.
WP Pin and Protection Status
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
Table 9-2.
Sector Protection Register
Sector Number
0 (0a, 0b)
1 to 3
Protected
See Table 9-3
FFH
Unprotected
00H
Table 9-3.
Sector 0 (0a, 0b)
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


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