w25q40bw Winbond Electronics Corp America, w25q40bw Datasheet - Page 23

• Manufacturer Part Number: w25q40bw
• Description: 1.8v 4m-bit Serial Flash Memory With Dual And Quad Spi
• Manufacturer: Winbond Electronics Corp America

To complete the Write Status Register instruction, the /CS pin must be driven high after the eighth or
sixteenth bit of data that is clocked in. If this is not done the Write Status Register instruction will not be
executed. If /CS is driven high after the eighth clock (compatible with the 25X series) the CMP, QE and
SRP1 bits will be cleared to 0.
During non-volatile Status Register write operation (06h combined with 01h), after /CS is driven high, the
self-timed Write Status Register cycle will commence for a time duration of t
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), after /CS is driven high, the
Status Register bits will be refreshed to the new values within the time period of t
Characteristics). BUSY bit will remain 0 during the Status Register bit refresh period.
Please refer to 10.1 for detailed Status Register Bit descriptions. Factory default for all status Register
bits are 0.
Figure 8. Write Status Register Instruction Sequence Diagram
Status Register 1
Status Register 1
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Publication Release Date: January 27, 2011
15 14 13 12 11 10
15 14 13 12 11 10
Status Register 2
Status Register 2
Status Register 2
W
(See AC Characteristics).
Preliminary - Revision A
W25Q40BW
9
9
8
8
SHSL2
(See AC