SST25VF032B View Datasheet(PDF) - Silicon Storage Technology
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SST25VF032B Datasheet PDF : 28 Pages
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Data Sheet
Write-Enable (WREN)
The Write-Enable (WREN) instruction sets the Write-
Enable-Latch bit in the Status Register to ‘1’ allowing Write
operations to occur. The WREN instruction must be exe-
cuted prior to any Write (Program/Erase) operation. The
WREN instruction may also be used to allow execution of
the Write-Status-Register (WRSR) instruction; however,
32 Mbit SPI Serial Flash
SST25VF032B
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 instruction is
executed.
CE#
MODE 3
SCK MODE 0
0 1 2345 6 7
SI
06
MSB
SO
HIGH IMPEDANCE
1327 F18.0
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,’ therefore, preventing any
new Write operations. The WRDI instruction will not termi-
nate any programming operation in progress. Any program
operation in progress may continue up to TBP after execut-
ing 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
1327 F19.0
FIGURE 18: 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 software
data protection (SDP) 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.
©2009 Silicon Storage Technology, Inc.
16
S71327-03-000
05/09
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