8 Mbit 1.8V SPI Serial Flash
A Microchip Technology Company
SST25WF080
Not Recommended for New Designs
Write-Status-Register (WRSR)
The Write-Status-Register instruction writes new values to the BP3, BP2, BP1, BP0, and BPL bits of
the status register. CE# must be driven low before the command sequence of the WRSR instruction is
entered and driven high before the WRSR instruction is executed. See Figure 21 for EWSR or WREN
and WRSR instruction sequences.
Executing the Write-Status-Register instruction will be ignored when WP# is low and BPL bit is set to
‘1’. When the WP# is low, the BPL bit can only be set from ‘0’ to ‘1’ to lock-down the status register, but
cannot be reset from ‘1’ to ‘0’. When WP# is high, the lock-down function of the BPL bit is disabled and
the BPL, BP0, BP1, BP2, and BP3 bits in the status register can all be changed. As long as BPL bit is
set to ‘0’ or WP# pin is driven high (V IH ) prior to the low-to-high transition of the CE# pin at the end of
the WRSR instruction, the bits in the status register can all be altered by the WRSR instruction. In this
case, a single WRSR instruction can set the BPL bit to ‘1’ to lock down the status register as well as
altering the BP0, BP1, BP2, and BP3 bits at the same time. See Table 3 for a summary description of
WP# and BPL functions.
CE#
SCK
MODE 3
MODE 0
0 1 2 3 4 5 6 7
MODE 3
MODE 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STATUS
REGISTER IN
SI
SO
MSB
50 or 06
01
MSB
HIGH IMPEDANCE
7 6 5 4 3 2 1 0
MSB
1203 F20.0
Figure 21: Enable-Write-Status-Register (EWSR) or Write-Enable (WREN) and Write-Sta-
tus-Register (WRSR) Sequence
Enable-Hold (EHLD)
The 8-bit command, AAH, Enable-Hold instruction enables the HOLD functionality of the RST#/
HOLD# pin. CE# must remain active low for the duration of the Enable-Hold instruction sequence. CE#
must be driven high before the instruction is executed. See Figure 22 for the Enable-Hold instruction
sequence.
CE#
MODE 3
0 1 2 3 4 5 6 7
SCK
SI
SO
MODE 0
AA
MSB
HIGH IMPEDANCE
1203 F21.0
Figure 22: Enable-Hold Sequence
?2012 Silicon Storage Technology, Inc.
22
DS25024B
03/12
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