SST25VF020B View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

Manufacturer

SST25VF020B

2 Mbit SPI Serial Flash

Silicon Storage Technology 

2 Mbit SPI Serial Flash

SST25VF020B

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 instruc-

tion followed by the WRSR instruction works like SDP (soft-

ware 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.

Data Sheet

©2010 Silicon Storage Technology, Inc.

19

S71417-02-000

04/10

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