w25q40bw Winbond Electronics Corp America, w25q40bw Datasheet - Page 21

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

W25Q40BW
8.2.7
Write Disable (04h)
The Write Disable instruction (Figure 6) resets the Write Enable Latch (WEL) bit in the Status Register to
a 0. The Write Disable instruction is entered by driving /CS low, shifting the instruction code “04h” into the
DI pin and then driving /CS high. Note that the WEL bit is automatically reset after Power-up and upon
completion of the Write Status Register, Erase/Program Security Registers, Page Program, Quad Page
Program, Sector Erase, Block Erase and Chip Erase instructions.
Write Disable instruction can also be used to invalidate the Write Enable for Volatile Status Register
instruction.
Figure 6. Write Disable Instruction Sequence Diagram
Publication Release Date: January 27, 2011
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Preliminary - Revision A