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W25Q16DVDAIG-TR Datasheet(PDF) 58 Page - Winbond |
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W25Q16DVDAIG-TR Datasheet(HTML) 58 Page - Winbond |
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58 / 80 page  - 58 - 7.2.37 Erase Security Registers (44h) The W25Q16DV offers three 256-byte Security Registers which can be erased and programmed individually. These registers may be used by the system manufacturers to store security and other important information separately from the main memory array. The Erase Security Register instruction is similar to the Sector Erase instruction. A Write Enable instruction must be executed before the device will accept the Erase Security Register Instruction (Status Register bit WEL must equal 1). The instruction is initiated by driving the /CS pin low and shifting the instruction code “44h” followed by a 24-bit address (A23-A0) to erase one of the three security registers. ADDRESS A23-16 A15-12 A11-8 A7-0 Security Register #1 00h 0 0 0 1 0 0 0 0 Don’t Care Security Register #2 00h 0 0 1 0 0 0 0 0 Don’t Care Security Register #3 00h 0 0 1 1 0 0 0 0 Don’t Care The Erase Security Register instruction sequence is shown in Figure 35. The /CS pin must be driven high after the eighth bit of the last byte has been latched. If this is not done the instruction will not be executed. After /CS is driven high, the self-timed Erase Security Register operation will commence for a time duration of tSE (See AC Characteristics). While the Erase Security Register cycle is in progress, the Read Status Register instruction may still be accessed for checking the status of the BUSY bit. The BUSY bit is a 1 during the erase cycle and becomes a 0 when the cycle is finished and the device is ready to accept other instructions again. After the Erase Security Register cycle has finished the Write Enable Latch (WEL) bit in the Status Register is cleared to 0. The Security Register Lock Bits LB[3:1] in the Status Register-2 can be used to OTP protect the security registers. Once a lock bit is set to 1, the corresponding security register will be permanently locked, Erase Security Register instruction to that register will be ignored (See 7.1.9 for detail descriptions). /CS CLK DI (IO 0) DO (IO 1) Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (44h) High Impedance 8 9 29 30 31 24-Bit Address 23 22 2 1 0 * Mode 0 Mode 3 = MSB * Figure 35. Erase Security Registers Instruction Sequence |
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