W25X40BL Datasheet, PDF (16/55 Pages) Winbond – 2.5V 4M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI

W25X40BL
7.2.5 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 DIO 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, Page Program, Sector Erase, Block Erase and Chip
Erase instructions.
/CS
CLK
Mode 3
Mode 0
DI
(IO₀)
DO
(IO₁)
01234567
Instruction (04h)
Mode 3
Mode 0
High Impedance
Figure 6. Write Disable Instruction Sequence Diagram
- 16 -