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M25PE80
10/43
modification to the Write Lock and Lock
Down Bits cannot be performed. A reset,
or power-up, is required before changes to
these bits can be made. When the Lock
Down Bit is reset, ‘0’, the Write Lock and
Lock Down Bits can be changed.
The Write Lock Bit and the Lock Down Bit are
volatile and their value is reset to ‘0’ after a
Power-Down or a Reset.
The definition of the Lock Register bits is given
in
Table 8., Lock Register Out
.
Refer to
Table 3.
and
Table 4.
for details on
the Software Protection for sectors 1 to 14 and
0 and 15, respectively.
Figure 6.
shows the the
Software Protection scheme.
Table 3. Software Protection Truth Table (Sectors 1 to 14)
Table 4. Software Protection Scheme Truth Table (Sectors 0 and 15)
Note: 1. All other bits combinations are not-applicable.
2. For more details, refer to the description of the
Write to Lock Register (WRLR)
instruction.
Sector Lock
Register
Protection Status
Lock
Down
Bit
Write
Lock
Bit
0
0
Sector Unprotected from Program/Erase/Write operations, Protection Status Reversible
0
1
Sector Protected from Program/Erase/Write operations, Protection Status Reversible
1
0
Sector Unprotected from Program/Erase/Write operations,
Sector Protection Status cannot be changed except by a Reset or Power-up.
1
1
Sector Protected from Program/Erase/Write operations,
Sector Protection Status cannot be changed except by a Reset or Power-up.
Sector Lock
Register
Sub-Sector
Lock Register
Protection Status
Lock
Down
Bit
Write
Lock
Bit
Lock
Down
Bit
Write
Lock
Bit
0
0
0
0
Current Sub-Sector Unprotected from Program/Erase/Write operations,
Current Sub-Sector Protection Status Reversible
0
1
Current Sub-Sector Protected from Program/Erase/Write operations,
Current Sub-Sector Protection Status Reversible.
1
0
Current Sub-Sector Unprotected from Program/Erase/Write operations, Current
Sub-Sector Protection Status cannot be changed except by a Reset or Power-up.
1
1
Current Sub-Sector Protected from Program/Erase/Write operations, Current
Sub-Sector Protection Status cannot be changed except by a Reset or Power-up.
1
0
1
All Sub-Sectors Protected from Program/Erase/Write operations, Current Sub-
Sector Protection Status Reversible
1
1
All Sub-Sectors Protected from Program/Erase/Write operations, Current Sub-
sector Protection Status cannot be changed except by a Reset or Power-up.
1
0
1
0
Current Sub-Sector Unprotected from Program/Erase/Write operations, All Sub-
sectors Protection Status cannot be changed except by a Reset or Power-up
1
1
Current Sub-Sector Protected from Program/Erase/Write operations, All Sub-
sectors Protection Status cannot be changed except by a Reset or Power-up
1
1
1
All Sub-sectors Protected with their Protection Status cannot be changed except
by a Reset or Power-up.