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AT45DB011D Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers |
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AT45DB011D Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers |
13 / 51 page ![]() 13 3639J–DFLASH–11/2012 AT45DB011D 9.1 Sector Protection Register The nonvolatile Sector Protection Register specifies which sectors are to be protected or unpro- tected with either the software or hardware controlled protection methods. The Sector Protection Register contains 4-bytes of data, of which byte locations 0 through 3 contain values that specify whether sectors 0 through 3 will be protected or unprotected. The Sector Protection Register is user modifiable and must first be erased before it can be reprogrammed. Table 9-3 illustrates the format of the Sector Protection Register. Note: 1. The default value for bytes 0 through 3 when shipped from Adesto is 00H. x = don’t care. 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 1 High 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 3 High Command Issued During Period 1 or 2 – Issue Command Not Issued Yet Issue Command – Enabled Disabled Enabled Read/Write Read/Write Read/Write Table 9-2. Sector Protection Register Sector Number 0 (0a, 0b) 1 to 3 Protected See Table 9-3 FFH Unprotected 00H Table 9-3. Sector 0 (0a, 0b) 0a 0b Bit3,2 Data Value (Page 0-7) (Page 8-127) Bit7,6 Bit5,4 Bit1,0 Sectors 0a, 0b Unprotected 00 00 xx xx 0xH Protect Sector 0a 11 00 xx xx CxH Protect Sector 0b (Page 8-127) 00 11 xx xx 3xH Protect Sectors 0a (Page 0-7), 0b (Page 8-127)(1) 11 11 xx xx FxH |
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