AT45DB642D

8.1Software Sector Protection

8.1.1Enable 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 command sequence has been clocked in, the CS pin must be deasserted after which the sector protection will be enabled.

Each transition represents 8 bits

8.1.2Disable 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.

Each transition represents 8 bits

13

3542M–DFLASH–11/2012