SST25VF020B Datasheet, PDF (11/33 Pages) Silicon Storage Technology, Inc – 2 Mbit SPI Serial Flash

2 Mbit SPI Serial Flash
SST25VF020B
Byte-Program
The Byte-Program instruction programs the bits in the
selected byte to the desired data. The selected byte must
be in the erased state (FFH) when initiating a Program
operation. A Byte-Program instruction applied to a pro-
tected memory area will be ignored.
Prior to any Write operation, the Write-Enable (WREN)
instruction must be executed. CE# must remain active low
for the duration of the Byte-Program instruction. The Byte-
Data Sheet
Program instruction is initiated by executing an 8-bit com-
mand, 02H, followed by address bits [A₂₃-A₀]. Following the
address, the data is input in order from MSB (bit 7) to LSB
(bit 0). CE# must be driven high before the instruction is
executed. The user may poll the Busy bit in the software
status register or wait T_BP for the completion of the internal
self-timed Byte-Program operation. See Figure 7 for the
Byte-Program sequence.
CE#
MODE 3
SCK ^{MODE 0}
0 1 2345 6 78
15 16
23 24 31 32 39
SI
02
MSB
SO
FIGURE 7: Byte-Program Sequence
ADD.
MSB
ADD.
HIGH IMPEDANCE
ADD. D_IN
MSB LSB
1417 ByteProg.0
©2010 Silicon Storage Technology, Inc.
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