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参数资料
| 型号： | AT45DB081D |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| 中文描述： | 8兆位2.5伏或2.7伏的DataFlash |
| 文件页数： | 13/53页 |
| 文件大小： | 1105K |
| 代理商： | AT45DB081D |
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13
3596E–DFLASH–02/07
AT45DB081D
9.
Hardware Controlled Protection
Sectors specified for protection in the Sector Protection Register and the Sector Protection Reg-
ister itself can be protected from program and erase operations by asserting the
W
P pin and
keeping the pin in its asserted state. The Sector Protection Register and any sector specified for
protection cannot be erased or reprogrammed as long as the
W
P pin is asserted. In order to
modify the Sector Protection Register, the
W
P pin must be deasserted. If the
W
P pin is perma-
nently connected to GND, then the content of the Sector Protection Register cannot be changed.
If the
W
P pin is deasserted, or permanently connected to V
CC
, then the content of the Sector
Protection Register can be modified.
The
W
P pin will override the software controlled protection method but only for protecting the
sectors. For example, if the sectors were not previously protected by the Enable Sector Protec-
tion command, then simply asserting the
W
P pin would enable the sector protection within the
maximum specified t
W
PE
time.
W
hen the
W
P pin is deasserted; however, the sector protection
would no longer be enabled (after the maximum specified t
W
PD
time) as long as the Enable Sec-
tor Protection command was not issued while the
W
P pin was asserted. If the Enable Sector
Protection command was issued before or while the
W
P pin was asserted, then simply deassert-
ing the
W
P pin would not disable the sector protection. In this case, the Disable Sector
Protection command would need to be issued while the
W
P pin is deasserted to disable the sec-
tor protection. The Disable Sector Protection command is also ignored whenever the
W
P pin is
asserted.
A noise filter is incorporated to help protect against spurious noise that may inadvertently assert
or deassert the
W
P pin.
The table below details the sector protection status for various scenarios of the
W
P pin, the
Enable Sector Protection command, and the Disable Sector Protection command.
Figure 9-1.
W
P Pin and Protection Status
WP
1
2
3
Table 9-1.
W
P 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/
W
rite
Read/
W
rite
Read/
W
rite
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/
W
rite
Read/
W
rite
Read/
W
rite
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB081D_07 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-MU | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-MU-2.5 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-SSU | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-SSU-2.5 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB081D_07 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_09 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:8-megabit 2.5V or 2.7V DataFlash |
| AT45DB081D-DWF | 制造商:Adesto Technologies Corporation 功能描述:WHOLE WAFER, NO BACKGRIND - Gel-pak, waffle pack, wafer, diced wafer on film |
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