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W25Q16JVSSIQ Datasheet(PDF) 25 Page - Winbond |
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W25Q16JVSSIQ Datasheet(HTML) 25 Page - Winbond |
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25 / 75 page  W25Q16JV Publication Release Date: March 22, 2018, 2018 - 24 - Revision G Write Status Register-1 (01h), Status Register-2 (31h) & Status Register-3 (11h) The Write Status Register instruction allows the Status Registers to be written. The writable Status Register bits include: SEC, TB, BP[2:0] in Status Register-1; CMP, LB[3:1], QE, SRL in Status Register-2; DRV1, DRV0, WPS in Status Register-3. All other Status Register bit locations are read-only and will not be affected by the Write Status Register instruction. LB[3:1] are non-volatile OTP bits, once it is set to 1, it cannot be cleared to 0. To write non-volatile Status Register bits, a standard Write Enable (06h) instruction must previously have been executed for the device to accept the Write Status Register instruction (Status Register bit WEL must equal 1). Once write enabled, the instruction is entered by driving /CS low, sending the instruction code “01h/31h/11h”, and then writing the status register data byte as illustrated in Figure 9a. To write volatile Status Register bits, a Write Enable for Volatile Status Register (50h) instruction must have been executed prior to the Write Status Register instruction (Status Register bit WEL remains 0). However, SRL and LB[3:1] cannot be changed from “1” to “0” because of the OTP protection for these bits. Upon power off or the execution of a Software/Hardware Reset, the volatile Status Register bit values will be lost, and the non-volatile Status Register bit values will be restored. During non-volatile Status Register write operation (06h combined with 01h/31h/11h), after /CS is driven high, the self-timed Write Status Register cycle will commence for a time duration of tW (See AC Characteristics). While the Write Status Register cycle is in progress, the Read Status Register instruction may still be accessed to check the status of the BUSY bit. The BUSY bit is a 1 during the Write Status Register cycle and a 0 when the cycle is finished and ready to accept other instructions again. After the Write Status Register cycle has finished, the Write Enable Latch (WEL) bit in the Status Register will be cleared to 0. During volatile Status Register write operation (50h combined with 01h/31h/11h), after /CS is driven high, the Status Register bits will be refreshed to the new values within the time period of tSHSL2 (See AC Characteristics). BUSY bit will remain 0 during the Status Register bit refresh period. Refer to section 7.1 for Status Register descriptions. Figure 9a. Write Status Register-1/2/3 Instruction /CS CLK DI (IO0) DO (IO1) Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (01h/31h/11h) High Impedance 8 9 10 11 12 13 14 15 7 6 5 4 3 2 1 0 Register-1/2/3 in Mode 0 Mode 3 * = MSB * |
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