SST25PF040B Datasheet, PDF (12/31 Pages) Microchip Technology – 4 Mbit 2.3-3.6V SPI Serial Flash

SST25PF040B
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 [A₂₃-A₀]. Address bits [A_MS-A₁₂] (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.
CE#
MODE 3
SCK ^{MODE 0}
0 1 23456 78
15 16
23 24 31
SI
20
ADD. ADD. ADD.
MSB
MSB
SO
HIGH IMPEDANCE
25134 SecErase.0
FIGURE 4-10:
SECTOR-ERASE SEQUENCE
4.4.8
32-KBYTE AND 64-KBYTE BLOCK-
ERASE
The 32-KByte Block-Erase instruction clears all bits in
the selected 32 KByte block to FFH. A Block-Erase
instruction applied to a protected memory area will be
ignored. The 64-KByte Block-Erase instruction clears all bits
in the selected 64 KByte block to FFH. A Block-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 32-KByte Block-Erase instruction is initiated by
executing an 8-bit command, 52H, followed by address
bits [A₂₃-A₀]. Address bits [A_MS-A₁₅] (A_MS = Most Sig-
nificant Address) are used to determine block address
(BA_X), remaining address bits can be V_IL or V_IH. CE#
must be driven high before the instruction is executed. The
64-KByte Block-Erase instruction is initiated by executing an
8-bit command D8H, followed by address bits [A₂₃-A₀].
Address bits [A_MS-A₁₆] are used to determine block address
(BA_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_BE for the completion of the internal self-timed 32-
KByte Block-Erase or 64-KByte Block-Erase cycles.
See Figures 4-11 and 4-12 for the 32-KByte Block-
Erase and 64-KByte Block-Erase sequences.
CE#
MODE 3
SCK ^{MODE 0}
0 1 23456 78
15 16
23 24 31
FIGURE 4-11:
SI
52
ADDR ADDR ADDR
MSB
MSB
SO
HIGH IMPEDANCE
25134 32KBklEr.0
32-KBYTE BLOCK-ERASE SEQUENCE
DS20005134B-page 12
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