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AT45DB321C Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT45DB321C Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 40 page  10 3387L–DFLASH–6/06 AT45DB321C Software Sector Protection is useful in applications in which the WP pin is not or cannot be con- trolled by a host processor. In such instances, the WP pin may be left floating (the WP pin is pulled high internally) and sector protection can be controlled using the software commands. If the device is power cycled, then the Software Sector Protection will be disabled. Once the device is powered up, the Enable Sector Protection command should be reissued if sector pro- tection is desired and if the WP pin is not used. The RESET pin has no effect on the Software Sector Protection. 6.2 Hardware Sector Protection Sectors specified for protection in Sector Protection Register can be protected from program and erase operations by utilizing the Write Protection (WP) pin. The protection can be enabled by asserting the WP pin and keeping the pin in its asserted state. Any sector specified for pro- tection cannot be erased or reprogrammed as long as the WP pin is asserted. The protection can be disabled by deasserting the WP pin high. A filter is provided on the WP pin to help protect against spurious noise on the WP pin. Hardware Sector Protection will provide continuous pro- tection, based on the contents of the Sector Protection Register, in an application where WP is always driven low. Please read “Write Protect (WP)” on page 15 for more information. 6.3 Sector Protection Register Sector Protection Register is a nonvolatile register that contains 16 bytes of data, as shown below: Note: 1. Default value for devices shipped from Atmel is 00H. Sector Number 0 (0a, 0b) 1 to 15 Protected See Below FFH Unprotected 00H Table 6-1. Sector 0 (0a, 0b): 0a (Page 0-7) 0b (Page 8-511) Bit 0, 1 Data Value Bit 6, 7 Bit 4, 5 Bit 2, 3 Sectors 0a, 0b Unprotected 00 00 00 00 00H Protect Sector 0a (Page 0-7) 11 00 00 00 C0H Protect Sector 0b (Page 8-511) 00 11 11 00 3CH Protect Sectors 0a, 0b (Page 0-511) 11 11 11 00 FCH |
Similar Part No. - AT45DB321C_06 |
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Similar Description - AT45DB321C_06 |
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