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AT45DB081D 데이터시트(PDF) 12 Page - Analog Devices

부품명 AT45DB081D
상세설명  8-megabit 2.5V or 2.7V DataFlash
PDF  53 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AT45DB081D 데이터시트(HTML) 12 Page - Analog Devices

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3596O–DFLASH–1/2013
AT45DB081D
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.
Table 8-1.
Enable Sector Protection Command
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.
Table 8-2.
Disenable Sector Protection Command
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.
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 bits
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 bits
SI



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