M25PE80 Datasheet, PDF (16/61 Pages) STMicroelectronics – 8 Mbit, low-voltage, Page-Erasable Serial Flash memory with Byte alterability, 50MHz SPI bus, standard pinout

Operating features
M25PE80
Table 2. Software protection truth table (Sectors 0 to 15, 64-Kbyte granularity)
Sector Lock Register
Lock
Write
Down Bit Lock Bit
Protection Status
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.
Sector Protected from Program/Erase/Write operations,
1
1
Sector Protection Status cannot be changed except by a Reset or Power-up.
Table 3.
Not for new design: TY7 process only, Software protection scheme truth
table (Sectors 0 and 15)^{(1) (2) (3)}
Sector Lock Subsector
Register Lock Register
Lock Write Lock Write
Down Lock Down Lock
Bit Bit Bit Bit
Protection Status
0
0
Current subsector Unprotected from Program/Erase/Write operations,
Current subsector Protection Status Reversible
Current subsector Protected from Program/Erase/Write operations,
0
1
Current subsector Protection Status Reversible.
0
1
0
Current subsector Unprotected from Program/Erase/Write operations, Current
subsector Protection Status cannot be changed except by a Reset or Power-up.
0
1
1
Current subsector Protected from Program/Erase/Write operations, Current
subsector Protection Status cannot be changed except by a Reset or Power-up.
0
1
All subsectors Protected from Program/Erase/Write operations, Current
subsector Protection Status Reversible
1
1
1
All subsectors Protected from Program/Erase/Write operations, Current
subsector Protection Status cannot be changed except by a Reset or Power-up.
1
0
Current subsector Unprotected from Program/Erase/Write operations, All
subsectors Protection Status cannot be changed except by a Reset or Power-up
0
1
1
1
Current subsector Protected from Program/Erase/Write operations, All
subsectors Protection Status cannot be changed except by a Reset or Power-up
1
1
1
All subsectors Protected with their Protection Status cannot be changed except
by a Reset or Power-up.
1. All other bit combinations are not-applicable.
2. For more details, refer to the description of the Write to Lock Register (WRLR) instruction.
3. See Important note on page 6 for differences between devices produced in T7Y and T9HX processes.
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