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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT45DB641E датащи(PDF) 24 Page - Renesas Technology Corp |
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AT45DB641E датащи(HTML) 24 Page - Renesas Technology Corp |
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24 / 69 page  24 AT45DB641E DS-45DB641E-027N–DFLASH–2/2022 Table 8-3. Sector 0 (0a and 0b) Sector Lockdown Register Byte Value Table 8-4. Read Sector Lockdown Register Command Figure 8-2. Read Sector Lockdown Register 8.1.2 Freeze Sector Lockdown The Sector Lockdown command can be permanently disabled, and the current sector lockdown state can be permanently frozen so that no additional sectors can be locked down aside from those already locked down. Any attempts to issue the Sector Lockdown command after the Sector Lockdown State has been frozen will be ignored. To issue the Freeze Sector Lockdown command, the CS pin must be asserted and the opcode sequence of 34h, 55h, AAh, and 40h must be clocked into the device. Any additional data clocked into the device will be ignored. When the CS pin is deasserted, the current sector lockdown state will be permanently frozen within a time of t LOCK. In addition, the SLE bit in the Status Register will be permanently reset to a Logic 0 to indicate that the Sector Lockdown command is permanently disabled. Table 8-5. Freeze Sector Lockdown Figure 8-3. Freeze Sector Lockdown Bit 7:6 Bit 5:4 Bit 3:2 Bit 1:0 Data Value Sector 0a (Page 0-7) Sector 0b (Page 8-1023) N/A N/A Sectors 0a and 0b Unlocked 00 00 00 00 00h Sector 0a Locked 11 00 00 00 C0h Sector 0b Locked 00 11 00 00 30h Sectors 0a and 0b Locked 11 11 00 00 F0h Command Byte 1 Byte 2 Byte 3 Byte 4 Read Sector Lockdown Register 35h XXh XXh XXh 32h XX XX XX Data n Data n + 1 CS Data n + 31 SI SO Each transition represents eight bits Command Byte 1 Byte 2 Byte 3 Byte 4 Freeze Sector Lockdown 34h 55h AAh 40h 34h 55h AAh 40h CS SI Each transition represents eight bits |
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