M25PE10 データシートの表示（PDF） - STMicroelectronics
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M25PE10 Datasheet PDF : 60 Pages
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Operating features
M25PE20, M25PE10
Table 2.
Software protection truth table (Sectors 0 to 3 for M25PE20 or sectors 0
to 1 for M25PE10, 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.
1
1
Sector Protected from Program/Erase/Write operations,
Sector Protection Status cannot be changed except by a Reset or Power-up.
● The second Software Protected mode (SPM2) uses the Block Protect (BP1, BP0,
see Section 6.4.3)) bits to allow part of the memory to be configured as read-only.
Table 3. Protected area sizes for M25PE20
Status Register
content
Memory content
BP1 Bit BP0 Bit
Protected area
0
0 none
0
1 Upper quarter (Sector 3)
1
0 Upper half (two sectors: 2 and 3)
Unprotected area
All sectors(1) (four sectors: 0 to 3)
Lower three quarters (three sectors: 0 to 2)
Lower half (two sectors: 0 to 1)
1
1 All sectors (four sectors: 0 to 3)
none
1. The device is ready to accept a Bulk Erase instruction if, and only if, all Block Protect bits (BP1, BP0) are 0.
Table 4. Protected area sizes for M25PE10
Status Register
content
Memory content
BP1 Bit BP0 Bit
Protected area
Unprotected area
0
0 none
All sectors(1) (two sectors: 0 and 1)
0
1 Upper half (1 sector: sector 1)
Lower half (one sector: sector 0)
1
0 Upper half (1 sector: sector 1)
Lower half (one sector: sector 0)
1
1 All sectors (two sectors: 0 and 1) none
1. The device is ready to accept a Bulk Erase instruction if, and only if, all Block Protect bits (BP1, BP0) are 0.
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