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参数资料
| 型号： | AT45DB021D |
| 厂商： | Atmel Corp. |
| 英文描述： | 2-megabit 2.7-volt DataFlash |
| 中文描述： | 2兆位2.7伏的DataFlash |
| 文件页数： | 15/52页 |
| 文件大小： | 1108K |
| 代理商： | AT45DB021D |
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15
3638B–DFLASH–02/07
AT45DB021D [Preliminary]
9.1.1
Erase Sector Protection Register Command
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, the CS pin must first be asserted as it would be with
any other command. Once the CS pin has been asserted, the appropriate 4-byte opcode
sequence must be clocked into the device via the SI pin. The 4-byte opcode sequence must
start with 3DH and be followed by 2AH, 7FH, and CFH. 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 time of t
PE
, during
which time 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 Regis-
ter cannot be guaranteed.
The Sector Protection Register can be erased with the 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 com-
mand 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.
Figure 9-2.
Erase Sector Protection Register
Command
Byte 1
Byte 2
Byte 3
Byte 4
Erase Sector Protection Register
3DH
2AH
7FH
CFH
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
CS
Each transition
represents
8
b
its
SI
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB021D_07 | 2-megabit 2.7-volt DataFlash |
| AT45DB021D-MU | 2-megabit 2.7-volt DataFlash |
| AT45DB021D-SSU | 2-megabit 2.7-volt DataFlash |
| AT45DB021D-SU | 2-megabit 2.7-volt DataFlash |
| AT45DB021 | 2-Megabit 2.7-volt Only Serial DataFlash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB021D_07 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-megabit 2.7-volt DataFlash |
| AT45DB021D_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-megabit 2.7-volt Minimum DataFlash |
| AT45DB021D_09 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-megabit 2.7-volt Minimum DataFlash |
| AT45DB021D-MH-SL954 | 制造商:Adesto Technologies Corporation 功能描述:8-UDFN (5X6), IND TEMP, 2.7V, TRAY, 256 BYTE PAGE - Trays |
| AT45DB021D-MH-SL955 | 制造商:Adesto Technologies Corporation 功能描述:8-UDFN (5X6), IND TEMP, 2.7V, T&R, 256 BYTE PAGE - Tape and Reel |
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