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参数资料
| 型号： | AT45DB041D-SSU |
| 厂商： | ATMEL CORP |
| 元件分类： | DRAM |
| 英文描述： | 4-megabit 2.5-volt or 2.7-volt DataFlash |
| 中文描述： | 4M X 1 FLASH 2.7V PROM, PDSO8 |
| 封装： | 0.150 INCH, GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 12/53页 |
| 文件大小： | 1085K |
| 代理商： | AT45DB041D-SSU |
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12
3595H–DFLASH–03/07
AT45DB041D
8.1
Software Sector Protection
8.1.1
Enable Sector Protection Command
Sectors specified for protection in the Sector Protection Register can be protected from program
and erase operations by issuing the Enable Sector Protection command. To enable the sector
protection using the software controlled method, 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 command
sequence must be clocked in via the input pin (SI). After the last bit of the command sequence
has been clocked in, the CS pin must be deasserted after which the sector protection will be
enabled.
Figure 8-1.
Enable Sector Protection
8.1.2
Disable Sector Protection Command
To disable the sector protection using the software controlled method, 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 sequence for the Disable Sector Protection command must be clocked in via
the input pin (SI). After the last bit of the command sequence has been clocked in, the CS pin
must be deasserted after which the sector protection will be disabled. The WP pin must be in the
deasserted state; otherwise, the Disable Sector Protection command will be ignored.
Figure 8-2.
Disable Sector Protection
8.1.3
Various Aspects About Software Controlled Protection
Software controlled protection is useful in applications in which the WP pin is not or cannot be
controlled by a host processor. In such instances, the WP pin may be left floating (the WP pin is
internally pulled high) and sector protection can be controlled using the Enable Sector Protection
and Disable Sector Protection commands.
If the device is power cycled, then the software controlled protection will be disabled. Once the
device is powered up, the Enable Sector Protection command should be reissued if sector pro-
tection is desired and if the WP pin is not used.
Command
Byte 1
Byte 2
Byte 3
Byte 4
Enable Sector Protection
3DH
2AH
7FH
A9H
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
CS
Each transition
represents
8
b
its
SI
Command
Byte 1
Byte 2
Byte 3
Byte 4
Disable Sector Protection
3DH
2AH
7FH
9AH
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 |
|---|---|
| AT45DB041D-SSU-2.5 | 4-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB041D-SU | 4-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB041D-SU-2.5 | 4-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB080 | KJL SERIES I |
| AT45DB080-RC | 8-Megabit 2.7-volt Only Sequential Access Parallel I/O DataFlash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB041D-SSU SL300 | 制造商:Atmel Corporation 功能描述:Flash Serial-SPI 3V/3.3V 4Mbit 6ns 8-Pin SOIC T/R |
| AT45DB041D-SSU SL383 | 制造商:Adesto Technologies 功能描述:Flash Serial-SPI 3V/3.3V 4Mbit 6ns 8-Pin SOIC T/R |
| AT45DB041D-SSU SL954 | 制造商:Adesto Technologies Corporation 功能描述: |
| AT45DB041D-SSU SL955 | 制造商:Adesto Technologies Corporation 功能描述: |
| AT45DB041D-SSU-2.5 | 功能描述:闪存 4MB SERIAL 2.5V - IND TEMP RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
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