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AT45DB321E Datasheet(PDF) 24 Page - List of Unclassifed Manufacturers

Part # AT45DB321E
Description  32-Mbit DataFlash (with Extra 1-Mbits), 2.3V Minimum SPI Serial Flash Memory
PDF  72 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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AT45DB321E Datasheet(HTML) 24 Page - List of Unclassifed Manufacturers

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AT45DB321E
8784E–DFLASH–10/2013
Table 8-3.
Sector 0 (0a and 0b) Sector Lockdown Register Byte Value
Table 8-4.
Read Sector Lockdown Register Command
Figure 8-2. Read Sector Lockdown Register
8.1.2
Freeze Sector Lockdown
The Sector Lockdown command can be permanently disabled, and the current sector lockdown state can be
permanently frozen so that no additional sectors can be locked down aside from those already locked down. Any
attempts to issue the Sector Lockdown command after the Sector Lockdown State has been frozen will be ignored.
To issue the Freeze Sector Lockdown command, the CS pin must be asserted and the opcode sequence of 34h, 55h,
AAh, and 40h must be clocked into the device. Any additional data clocked into the device will be ignored. When the CS
pin is deasserted, the current sector lockdown state will be permanently frozen within a time of tLOCK. In addition, the SLE
bit in the Status Register will be permanently reset to a Logic 0 to indicate that the Sector Lockdown command is
permanently disabled.
Table 8-5.
Freeze Sector Lockdown
Figure 8-3. Freeze Sector Lockdown
Bit 7:6
Bit 5:4
Bit 3:2
Bit 1:0
Data
Value
Sector 0a
(Page 0-7)
Sector 0b
(Page 8-127)
N/A
N/A
Sectors 0a and 0b Unlocked
00
00
00
00
00h
Sector 0a Locked
11
00
00
00
C0h
Sector 0b Locked
00
11
00
00
30h
Sectors 0a and 0b Locked
11
11
00
00
F0h
Command
Byte 1
Byte 2
Byte 3
Byte 4
Read Sector Lockdown Register
35h
XXh
XXh
XXh
35h
XX
XX
XX
Data
n
Data
n + 1
CS
SI
SO
Data
n + 63
Each transition represents eight bits
Command
Byte 1
Byte 2
Byte 3
Byte 4
Freeze Sector Lockdown
34h
55h
AAh
40h
34h
55h
AAh
40h
CS
SI
Each transition represents eight bits



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