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32 Mbit SPI Serial Flash
A Microchip Technology Company
SST25VF032B
Data Sheet
Auto Address Increment (AAI)
The Auto Address Increment Programming-Status bit provides status on whether the device is in AAI
programming mode or Byte-Program mode. The default at power up is Byte-Program mode.
Block Protection (BP3,BP2, BP1, BP0)
The Block-Protection (BP3, BP2, BP1, BP0) bits define the size of the memory area, as shown in Table
4, to be software protected against any memory Write (Program or Erase) operation. The Write-Status-
Register (WRSR) instruction is used to program the BP3, BP2, BP1 and BP0 bits as long as WP# is
high or the Block-Protect-Lock (BPL) bit is 0. Chip-Erase can only be executed if Block-Protection bits
are all 0. After power-up, BP3, BP2, BP1 and BP0 are set to the defaults specified in Table 4.
Block Protection Lock-Down (BPL)
WP# pin driven low (V IL ), enables the Block-Protection-Lock-Down (BPL) bit. When BPL is set to 1, it
prevents any further alteration of the BPL, BP3, BP2, BP1, and BP0 bits. When the WP# pin is driven
high (V IH ), the BPL bit has no effect and its value is “Don’t Care”. After power-up, the BPL bit is reset to
0.
Table 4: Software Status Register Block Protection FOR SST25VF032B 1
Status Register Bit 2
Protected Memory Address
Protection Level
None
Upper 1/64
Upper 1/32
Upper 1/16
Upper 1/8
Upper 1/4
Upper 1/2
All Blocks
BP3
X
X
X
X
X
X
X
X
BP2
0
0
0
0
1
1
1
1
BP1
0
0
1
1
0
0
1
1
BP0
0
1
0
1
0
1
0
1
32 Mbit
None
3F0000H-3FFFFFH
3E0000H-3FFFFFH
3C0000H-3FFFFFH
380000H-3FFFFFH
300000H-3FFFFFH
200000H-3FFFFFH
000000H-3FFFFFH
T4.0 25071
1. X = Don’t Care (RESERVED) default is “0
2. Default at power-up for BP2, BP1, and BP0 is ‘111’. (All Blocks Protected)
?2011 Silicon Storage Technology, Inc.
8
DS25071A
12/11
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