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AT45DB011D Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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AT45DB011D Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 51 page  11 3639J–DFLASH–11/2012 AT45DB011D 8. Sector Protection Two protection methods, hardware and software controlled, are provided for protection against inadvertent or erroneous program and erase cycles. The software controlled method relies on the use of software commands to enable and disable sector protection while the hardware con- trolled method employs the use of the Write Protect (WP) pin. The selection of which sectors that are to be protected or unprotected against program and erase operations is specified in the nonvolatile Sector Protection Register. The status of whether or not sector protection has been enabled or disabled by either the software or the hardware controlled methods can be deter- mined by checking the Status Register. 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 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 |
Similar Part No. - AT45DB011D_12 |
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