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AT25DF641A Datasheet(PDF) 24 Page - ATMEL Corporation |
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AT25DF641A Datasheet(HTML) 24 Page - ATMEL Corporation |
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24 / 57 page  24 8693A–DFLASH–8/10 Atmel AT25DF641A [Preliminary] Essentially, if the SPRL bit of the Status Register is in the logical “0” state (Sector Protection Registers are not locked), then writing a 00h to the first byte of the Status Register will perform a Global Unprotect without changing the state of the SPRL bit. Similarly, writing a 7Fh to the first byte of the Status Register will perform a Global Protect and keep the SPRL bit in the logical “0” state. The SPRL bit can, of course, be changed to a logical “1” by writing an FFh if software-lock- ing or hardware-locking is desired along with the Global Protect. Table 9-2. Valid SPRL and Global Protect/Unprotect Conditions WP State Current SPRL Value New Write Status Register Byte 1 Data Protection Operation New SPRL Value Bit 76543210 00 0x0000xx 0x0001xx 0x1110xx 0x1111xx 1x0000xx 1x0001xx 1x1110xx 1x1111xx Global Unprotect – all Sector Protection Registers reset to 0 No change to current protection. No change to current protection. No change to current protection. Global Protect – all Sector Protection Registers set to 1 Global Unprotect – all Sector Protection Registers reset to 0 No change to current protection. No change to current protection. No change to current protection. Global Protect – all Sector Protection Registers set to 1 0 0 0 0 0 1 1 1 1 1 0 1 xxxxxxxx No change to the current protection level. All sectors currently protected will remain protected and all sectors currently unprotected will remain unprotected. The Sector Protection Registers are hard-locked and cannot be changed when the WP pin is LOW and the current state of SPRL is 1. Therefore, a Global Protect/Unprotect will not occur. In addition, the SPRL bit cannot be changed (the WP pin must be HIGH in order to change SPRL back to a 0). 10 0x0000xx 0x0001xx 0x1110xx 0x1111xx 1x0000xx 1x0001xx 1x1110xx 1x1111xx Global Unprotect – all Sector Protection Registers reset to 0 No change to current protection. No change to current protection. No change to current protection. Global Protect – all Sector Protection Registers set to 1 Global Unprotect – all Sector Protection Registers reset to 0 No change to current protection. No change to current protection. No change to current protection. Global Protect – all Sector Protection Registers set to 1 0 0 0 0 0 1 1 1 1 1 11 0x0000xx 0x0001xx 0x1110xx 0x1111xx 1x0000xx 1x0001xx 1x1110xx 1x1111xx No change to the current protection level. All sectors currently protected will remain protected, and all sectors currently unprotected will remain unprotected. The Sector Protection Registers are soft-locked and cannot be changed when the current state of SPRL is 1. Therefore, a Global Protect/Unprotect will not occur. However, the SPRL bit can be changed back to a 0 from a 1 since the WP pin is HIGH. To perform a Global Protect/Unprotect, the Write Status Register command must be issued again after the SPRL bit has been changed froma1toa0. 0 0 0 0 0 1 1 1 1 1 |
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