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AT45DB321E Datasheet(PDF) 27 Page - Renesas Technology Corp |
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AT45DB321E Datasheet(HTML) 27 Page - Renesas Technology Corp |
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27 / 80 page  DS-AT45DB321E-8784 Rev. N Page 27 9/1/23 © 2023 Renesas Electronics AT45DB321E Datasheet 7.14 Software Sector 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 can 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 is disabled. Once the device is powered up, the Enable Sector Protection command must be reissued if sector protection is desired and if the WP pin is not used. 7.14.1 Enable Sector Protection 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, a four-byte command sequence of 3Dh, 2Ah, 7Fh, and A9h must be clocked into the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to enable the Sector Protection. Table 6. Enable Sector Protection Command Figure 5. Enable Sector Protection 7.14.2 Disable Sector Protection To disable the sector protection, a four-byte command sequence of 3Dh, 2Ah, 7Fh, and 9Ah must be clocked into the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to disable the sector protection. Table 7. Disable Sector Protection Command Figure 6. Disable Sector Protection Command Byte 1 Byte 2 Byte 3 Byte 4 Enable Sector Protection 3Dh 2Ah 7Fh A9h Command Byte 1 Byte 2 Byte 3 Byte 4 Disable Sector Protection 3Dh 2Ah 7Fh 9Ah 3Dh 2Ah 7Fh A9h CS Each transition represents eight bits SI 3Dh 2Ah 7Fh 9Ah CS Each transition represents eight bits SI |
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