W25X20BV WINBOND [Winbond], W25X20BV Datasheet - Page 16

• Manufacturer Part Number: W25X20BV
• Description: 1M-BIT, 2M-BIT AND 4M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI
• Manufacturer: WINBOND [Winbond]

9.2.3
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.
9.2.4
The Write Disable 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.
Write Enable (06h)
Write Disable (04h)
Figure 5. Write Disable Instruction Sequence Diagram
Figure 4. Write Enable Instruction Sequence Diagram
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W25X10BV/20BV/40BV