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W25Q16DVDAIG-TR Datasheet(PDF) 25 Page - Winbond |
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W25Q16DVDAIG-TR Datasheet(HTML) 25 Page - Winbond |
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25 / 80 page  Publication Release Date: January 26, 2015 - 25 - Revision J 7.2.8 Read Status Register-1 (05h) and Read Status Register-2 (35h) The Read Status Register instructions allow the 8-bit Status Registers to be read. The instruction is entered by driving /CS low and shifting the instruction code “05h” for Status Register-1 or “35h” for Status Register-2 into the DI pin on the rising edge of CLK. The status register bits are then shifted out on the DO pin at the falling edge of CLK with most significant bit (MSB) first as shown in Figure 7. The Status Register bits are shown in Figure 3a and 3b and include the BUSY, WEL, BP2-BP0, TB, SEC, SRP0, SRP1, QE, LB[3:1], CMP and SUS bits (see Status Register section earlier in this datasheet). The Read Status Register instruction may be used at any time, even while a Program, Erase or Write Status Register cycle is in progress. This allows the BUSY status bit to be checked to determine when the cycle is complete and if the device can accept another instruction. The Status Register can be read continuously, as shown in Figure 7. The instruction is completed by driving /CS high. /CS CLK DI (IO 0) DO (IO 1) Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (05h or 35h) High Impedance 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 Status Register 1 or 2 out Status Register 1 or 2 out * * = MSB * Figure 7. Read Status Register Instruction Sequence Diagram 7.2.9 Write Status Register (01h) The Write Status Register instruction allows the Status Register to be written. Only non-volatile Status Register bits SRP0, SEC, TB, BP2, BP1, BP0 (bits 7 thru 2 of Status Register-1) and CMP, LB3, LB2, LB1, QE, SRP1 (bits 14 thru 8 of Status Register-2) can be written to. 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 can not be cleared to 0. The Status Register bits are shown in Figure 3 and described in 7.1. 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”, and then writing the status register data byte as illustrated in Figure 8. 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, SRP1 and LB3, LB2, LB1 can not be changed from “1” to “0” because of the OTP protection for these bits. Upon power off, the volatile Status Register bit values will be lost, and the non-volatile Status Register bit values will be restored when power on again. |
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