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AT45DB011D Datasheet(PDF) 13 Page - ATMEL Corporation |
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AT45DB011D Datasheet(HTML) 13 Page - ATMEL Corporation |
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13 / 52 page  13 3639B–DFLASH–02/07 AT45DB011D [Preliminary] 9. Hardware Controlled Protection Sectors specified for protection in the Sector Protection Register and the Sector Protection Reg- ister itself can be protected from program and erase operations by asserting the WP pin and keeping the pin in its asserted state. The Sector Protection Register and any sector specified for protection cannot be erased or reprogrammed as long as the WP pin is asserted. In order to modify the Sector Protection Register, the WP pin must be deasserted. If the WP pin is perma- nently connected to GND, then the content of the Sector Protection Register cannot be changed. If the WP pin is deasserted, or permanently connected to V CC, then the content of the Sector Protection Register can be modified. The WP pin will override the software controlled protection method but only for protecting the sectors. For example, if the sectors were not previously protected by the Enable Sector Protec- tion command, then simply asserting the WP pin would enable the sector protection within the maximum specified t WPE time. When the WP pin is deasserted; however, the sector protection would no longer be enabled (after the maximum specified t WPD time) as long as the Enable Sec- tor Protection command was not issued while the WP pin was asserted. If the Enable Sector Protection command was issued before or while the WP pin was asserted, then simply deassert- ing the WP pin would not disable the sector protection. In this case, the Disable Sector Protection command would need to be issued while the WP pin is deasserted to disable the sec- tor protection. The Disable Sector Protection command is also ignored whenever the WP pin is asserted. A noise filter is incorporated to help protect against spurious noise that may inadvertently assert or deassert the WP pin. The table below details the sector protection status for various scenarios of the WP pin, the Enable Sector Protection command, and the Disable Sector Protection command. Figure 9-1. WP Pin and Protection Status WP 12 3 Table 9-1. WP Pin and Protection Status Time Period WP Pin Enable Sector Protection Command Disable Sector Protection Command Sector Protection Status Sector Protection Register 1High Command Not Issued Previously – Issue Command X Issue Command – Disabled Disabled Enabled Read/Write Read/Write Read/Write 2 Low X X Enabled Read Only 3High Command Issued During Period 1 or 2 – Issue Command Not Issued Yet Issue Command – Enabled Disabled Enabled Read/Write Read/Write Read/Write |
Similar Part No. - AT45DB011D_07 |
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