Datasheet

SST26VF032B / SST26VF032BA
DS20005218E-page 36  2013-2016 Microchip Technology Inc.
5.34 Write Block-Protection Register
(WBPR)
The Write Block-Protection Register (WBPR) com-
mand changes the Block-Protection register data to
indicate the protection status. Execute WREN before
executing WBPR.
To execute a Write Block-Protection Register operation
the host drives CE# low, sends the Write Block-Protec-
tion Register command cycle (42H), sends 18 cycles of
data, and finally drives CE# high. Data input must be
most significant bit(s) first. See Table 5-6 for definitions
of each bit in the Block-Protection register. See Figures
5-38 and 5-39.
FIGURE 5-38: WRITE BLOCK-PROTECTION REGISTER SEQUENCE (SQI)
FIGURE 5-39: WRITE BLOCK-PROTECTION REGISTER SEQUENCE (SPI).
20005218 F35.1
MODE 3 0
SCK
SIO(3:0)
CE#
C1 C0
MODE 0
2
H0 L0
MSN
LSN
4
H1 L1
6
H2 L2
8
H3 L3
10
H4 L4
12
H5 L5 HN LN
BPR [79:72]
BPR [7:0]
Note: MSN = Most Significant Nibble, LSN = Least Significant Nibble
Block-Protection Register (BPR) C[1:0]=42H
CE#
SO
SI
SCK
Data Byte0
012345678
Data Byte1 Data Byte2
Data ByteN
42H
15 16
23 24
31
32
MODE 0
MODE 3
OP Code
20005218 F66.1
Note: C[1:0]=42H