Datasheet

SST25VF080B
DS20005045C-page 12  2015 Microchip Technology Inc.
4.4.7 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 command
sequence. The Sector-Erase instruction is initiated by
executing an 8-bit command, 20H, followed by address
bits [A
23
-A
0
]. Address bits [A
MS
-A
12
] (A
MS
=Most Sig-
nificant 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 exe-
cuted. 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 4-10
for the Sector-Erase sequence.
FIGURE 4-10: SECTOR-ERASE SEQUENCE
CE#
SO
SI
SCK
ADD.
012345678
ADD. ADD.
20
HIGH IMPEDANCE
15 16
23
24
31
MODE 0
MODE 3
1296 SecErase.0
MSBMSB