W25Q257FVEIF-TR Datasheet, PDF (34/104 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q257FV
The Write Status Register instruction can be used in both SPI mode and QPI mode. However, the QE bit
cannot be written to when the device is in the QPI mode, because QE=1 is required for the device to
enter and operate in the QPI mode.
Refer to section 7.1 for Status Register descriptions. Factory default for all status Register bits are 0,
except ADP and QE with ordering options “IQ”.
/CS
Mode 3
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Mode 3
CLK _{Mode 0}
Mode 0
DI
(IO₀)
DO
(IO₁)
* ^{= MSB}
Instruction
(01h/31h/11h)
Register-1/2/3 in
76543210
*
High Impedance
Figure 9a. Write Status Register-1/2/3 Instruction (SPI Mode)
/CS
CLK
IO₀
Mode 3
Mode 0
0123
Instruction _SR1/2/3
01/31/11h in
40
Mode 3
Mode 0
IO₁
51
IO₂
62
IO₃
73
Figure 9b. Write Status Register-1/2/3 Instruction (QPI Mode)
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