512 Kbit SPI Serial Flash
A Microchip Technology Company
SST25VF512
Data Sheet
Read-Status-Register (RDSR)
The Read-Status-Register (RDSR) instruction allows reading of the status register. The status register
may be read at any time even during a Write (Program/Erase) operation. When a Write operation is in
progress, the Busy bit may be checked before sending any new commands to assure that the new
commands are properly received by the device. CE# must be driven low before the RDSR instruction is
entered and remain low until the status data is read. Read-Status-Register is continuous with ongoing
clock cycles until it is terminated by a low to high transition of the CE#. See Figure 10 for the RDSR
instruction sequence.
CE#
MODE 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SCK
SI
MODE 0
MSB
05
SO
HIGH IMPEDANCE
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MSB
Status
Register Out
1192 F37.7
Figure 10: Read-Status-Register (RDSR) Sequence
Write-Enable (WREN)
The Write-Enable (WREN) instruction sets the Write-Enable-Latch bit to 1 allowing Write operations to
occur. The WREN instruction must be executed prior to any Write (Program/Erase) operation. CE#
must be driven high before the WREN instruction is executed.
CE#
MODE 3
0 1 2 3 4 5 6 7
SCK
SI
SO
MODE 0
06
MSB
HIGH IMPEDANCE
1192 F35.6
Figure 11: Write Enable (WREN) Sequence
?2011 Silicon Storage Technology, Inc.
15
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