MX25L12835F
9-36. Dynamic Write Protection Bits
The Dynamic Protection allows the software application to easily protect sectors against inadvertent change.
However, the protection can be easily disabled when changes are necessary.
All Dynamic Protection bits (DPB) are volatile and assigned to each sector. They can be modified individually. DPBs
provide the protection scheme only for unprotected sectors that have their SPBs cleared .To modify the DPB status
by issuing the DPB Program command , then placing each sector in the protected or unprotected state separately.
After the DPB state is set to "0", the sector may be modified depending on the SPB state of that sector.
The DPBs are protected (FFh) upon power up or reset. Program or erase function can only be operated after the
unlock instruction is conducted.
DPB Register (DPBR)
Bit
Description
Bit Status
Default
Type
00h= DPB for the sector address unprotected
FFh=DPB for the sector address protected
7 to 0 DPB (Dynamic protected Bit)
FFh
Volatile
Figure 66. Read DPB Register (RDDPB) Sequence
CS#
0
1
2
3
4
5
6
7
8
9
37 38 39 40 41 42 43 44 45 46 47
Mode 3
Mode 0
SCLK
Command
E0h
32-Bit Address
(Note)
A31 A30
A2 A1 A0
SI
MSB
Data Out
High-Z
SO
7
6
5
4
3
2
1
0
MSB
Note: One dummy byte follow 3-byte address.
Figure 67. Write DPB Register (WRDPB) Sequence
CS#
0
1
2
3
4
5
6
7
8
9
37 38 39 40 41 42 43 44 45 46 47
Mode 3
Mode 0
SCLK
Command
E1h
Data Byte 1
32-Bit Address
(Note)
A31 A30
A2 A1 A0
SI
7
6
5
4
3
2
1
0
MSB
MSB
Note: One dummy byte follow 3-byte address.
P/N: PM1795
REV. 1.0, OCT. 23, 2012
70
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