W25X16_08 Datasheet, PDF (18/50 Pages) Winbond – 16M-BIT, 32M-BIT, AND 64M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

W25X16, W25X16A, W25X32, W25X64
12.2.3 Write Enable (06h)
The Write Enable instruction (Figure 4) sets the Write Enable Latch (WEL) bit in the Status Register to
a 1. The WEL bit must be set prior to every Page Program, Sector Erase, Block Erase, Chip Erase
and Write Status Register instruction. The Write Enable instruction is entered by driving /CS low,
shifting the instruction code “06h” into the Data Input (DI) pin on the rising edge of CLK, and then
driving /CS high.
Figure 4. Write Enable Instruction Sequence Diagram
12.2.4 Write Disable (04h)
The Write Dissable instruction (Figure 5) 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.
Figure 5. Write Disable Instruction Sequence Diagram
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