AT45DB321E-MWUF2B-T View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
AT45DB321E-MWUF2B-T
Unspecified
'AT45DB321E-MWUF2B-T' PDF : 72 Pages View PDF
7.3 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 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 be erased before it can be reprogrammed. Table 7-4
illustrates the format of the Sector Protection Register.
Table 7-4. Sector Protection Register
Sector Number
Protected
Unprotected
0 (0a, 0b)
See Table 7-5
1 to 63
FFh
00h
Note: 1. The default values for bytes 0 through 63 are 00h when shipped from Adesto.
Table 7-5. Sector 0 (0a, 0b) Sector Protection Register Byte Value
Sectors 0a and 0b Unprotected
Protect Sector 0a
Protect Sector 0b
Protect Sectors 0a and 0b
Bit 7:6
Sector 0a
(Page 0-7)
00
11
00
11
Bit 5:4
Sector 0b
(Page 8-127)
00
00
11
11
Bit 3:2
N/A
XX
XX
XX
XX
Bit 1:0
N/A
XX
XX
XX
XX
Data
Value
0xh
Cxh
3xh
Fxh
Note: 1. x = Don’t care
7.3.1
Erase Sector Protection Register
In order to modify and change the values of the Sector Protection Register, it must first be erased using the Erase Sector
Protection Register command.
To erase the Sector Protection Register, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and CFh must be clocked into
the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to initiate the
internally self-timed erase cycle. The erasing of the Sector Protection Register should take place in a maximum time of
tPE. During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy. If the device is
powered-down before the completion of the erase cycle, then the contents of the Sector Protection Register cannot be
guaranteed.
The Sector Protection Register can be erased with sector protection enabled or disabled. Since the erased state (FFh) of
each byte in the Sector Protection Register is used to indicate that a sector is specified for protection, leaving the sector
protection enabled during the erasing of the register allows the protection scheme to be more effective in the prevention
of accidental programming or erasing of the device. If for some reason an erroneous program or erase command is sent
to the device immediately after erasing the Sector Protection Register and before the register can be reprogrammed,
then the erroneous program or erase command will not be processed because all sectors would be protected.
Table 7-6. Erase Sector Protection Register Command
Command
Erase Sector Protection Register
Byte 1
3Dh
Byte 2
2Ah
Byte 3
7Fh
Byte 4
CFh
AT45DB321E 20
8784E–DFLASH–10/2013
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