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AT45DB642D-TU Datasheet(PDF) 13 Page - ATMEL Corporation |
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AT45DB642D-TU Datasheet(HTML) 13 Page - ATMEL Corporation |
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13 / 55 page  13 3542F–DFLASH–09/06 AT45DB642D 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 pins (SI or I/O7-I/O0). After the last bit of the com- mand 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 pins (SI or I/O7-I/O0). 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 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 or IO 7 - IO0 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 or IO 7 - IO0 |
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