SST25VF020B-80-4I-QAE View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

SST25VF020B-80-4I-QAE

2 Mbit SPI Serial Flash

Microchip Technology 

A Microchip Technology Company

2 Mbit SPI Serial Flash

SST25VF020B

Figure 18:Write Enable (WREN) Sequence

Data Sheet

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.

CE#

MODE 3

SCK MODE 0

0 1 2345 6 7

SI

04

MSB

SO

HIGH IMPEDANCE

1417 WRDI.0

Figure 19:Write Disable (WRDI) Sequence

Enable-Write-Status-Register (EWSR)

The Enable-Write-Status-Register (EWSR) instruction arms the Write-Status-Register (WRSR)

instruction and opens the status register for alteration. The Write-Status-Register instruction must be

executed immediately after the execution of the Enable-Write-Status-Register instruction. This two-

step instruction sequence of the EWSR instruction followed by the WRSR instruction works like SDP

(software data protection) command structure which prevents any accidental alteration of the status

register values. CE# must be driven low before the EWSR instruction is entered and must be driven

high before the EWSR instruction is executed.

©2011 Silicon Storage Technology, Inc.

21

S71417-03-000

02/11

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