Datasheet

©2013 Silicon Storage Technology, Inc. DS20005054C 04/13
17
2 Mbit SPI Serial Flash
SST25VF020B
Data Sheet
4-KByte Sector-Erase
The Sector-Erase instruction clears all bits in the selected 4 KByte sector to FFH. A Sector-Erase
instruction applied to a protected 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 any com-
mand sequence. The Sector-Erase instruction is initiated by executing an 8-bit command, 20H, fol-
lowed by address bits [A
23
-A
0
]. Address bits [A
MS
-A
12
] (A
MS
= Most Significant address) are used to
determine the sector address (SA
X
), remaining address bits can be V
IL
or V
IH.
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
SE
for the completion of the internal self-timed Sector-Erase cycle. See Figure 12 for the Sector-
Erase sequence.
Figure 12:Sector-Erase Sequence
CE#
SO
SI
SCK
ADD.
012345678
ADD. ADD.
20
HIGH IMPEDANCE
15 16
23
24
31
MODE 0
MODE 3
1417 SecErase.0
MSBMSB