SST25VF080B datasheet(19/36 Pages) MICROCHIP

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S71296-05-000

02/11

8 Mbit SPI Serial Flash

SST25VF080B

Data Sheet

A Microchip Technology Company

Write-Enable (WREN)

The Write-Enable (WREN) instruction sets the Write-Enable-Latch bit in the Status Register to 1 allow-

ing Write operations to occur. The WREN instruction must be executed prior to any Write (Program/

Erase) operation. The WREN instruction may also be used to allow execution of the Write-Status-Reg-

ister (WRSR) instruction; however, the Write-Enable-Latch bit in the Status Register will be cleared

upon the rising edge CE# of the WRSR instruction. CE# must be driven high before the WREN instruc-

tion is executed.

Figure 17:Write Enable (WREN) Sequence

Write-Disable (WRDI)

The Write-Disable (WRDI) instruction resets the Write-Enable-Latch bit and AAI bit to 0 disabling any

new Write operations from occurring. The WRDI instruction will not terminate any programming opera-

tion in progress. Any program operation in progress may continue up to TBP after executing the WRDI

instruction. CE# must be driven high before the WRDI instruction is executed.

Figure 18:Write Disable (WRDI) Sequence

CE#

SCK

01 2 3 4 5 6 7

HIGH IMPEDANCE

MODE 0

MODE 3

1296 WREN.0

MSB

CE#

SCK

01 2 3 4 5 6 7

HIGH IMPEDANCE

MODE 0

MODE 3

1296 WRDI.0

MSB

SST25VF080B Datasheet(PDF) 19 Page - Microchip Technology