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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT25PE20 датащи(PDF) 18 Page - Dialog Semiconductor |
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AT25PE20 датащи(HTML) 18 Page - Dialog Semiconductor |
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18 / 64 page  17 AT25PE20 DS-25PE20–139C–8/2018 7.2 Hardware Controlled Protection Sectors specified for protection in the Sector Protection Register and the Sector Protection Register 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 programmed 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 permanently connected to GND, then the contents of the Sector Protection Register cannot be changed. If the WP pin is deasserted or permanently connected to V CC, then the contents of the Sector Protection Register can be modified. The WP pin will override the software controlled protection method but only for protecting the sectors. Example: If the sectors were not previously protected by the Enable Sector Protection command, then simply asserting the WP pin would enable the sector protection within the maximum specified tWPE 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 Sector 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 deasserting 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 sector 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 my inadvertently assert or deassert the WP pin. Figure 7-3 and Table 7-3 detail the sector protection status for various scenarios of the WP pin, the Enable Sector Protection command, and the Disable Sector Protection command. Figure 7-3. WP Pin and Protection Status Table 7-3. WP Pin and Protection Status Time Period WP Pin Enable Sector Protection Command Disable Sector Protection Command Sector Protection Status Sector Protection Register 1 High Command Not Issued Previously X Disabled Read/Write — Issue Command Disabled Read/Write Issue Command — Enabled Read/Write 2 Low X X Enabled Read 3 High Command Issued During Period 1 or 2 Not Issued Yet Enabled Read/Write — Issue Command Disabled Read/Write Issue Command — Enabled Read/Write WP 1 2 3 |
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