Operating features
M25PX16
modification to the Write Lock and Lock Down bits cannot be performed. A 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 definition of the Lock Register bits is given in Table 9: Lock Register out.
Table 2.
Software protection truth table (Sectors 0 to 63, 64 Kbyte granularity)
Sector Lock
Register
Protection status
Lock
Write
Down bit Lock bit
Sector unprotected from Program/Erase/Write operations, protection status
reversible
0
0
1
1
0
1
0
1
Sector protected from Program/Erase/Write operations, protection status
reversible
Sector unprotected from Program/Erase/Write operations,
Sector protection status cannot be changed except by a power-up.
Sector protected from Program/Erase/Write operations,
Sector protection status cannot be changed except by a Power-up.
the second software protected mode (SPM2) uses the Block Protect bits (see
Section 6.4.3: BP2, BP1, BP0 bits) and the Top/Bottom bit (see Section 6.4.4: TB bit) to
allow part of the memory to be configured as read-only.
Table 3.
Protected area sizes
Status Register
Memory content
contents
TB BP BP BP
bit bit 2 bit 1 bit 0
Protected area
Unprotected area
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
none
All sectors(1) (32 sectors: 0 to 31)
Lower 31/32nds (31 sectors: 0 to 30)
Lower 15/16ths (30 sectors: 0 to 29)
Lower 7/8ths (28 sectors: 0 to 27)
Lower 3/4ths (24 sectors: 0 to 23)
Lower half (16 sectors: 0 to 15)
none
Upper 32nd (Sector 31)
Upper 16th (2 sectors: 30 and 31)
Upper 8th (4 sectors: 28 to 31)
Upper 4th (8 sectors: 24 to 31)
Upper half (16 sectors: 16 to 31)
All sectors (32 sectors: 0 to 31)
All sectors (32 sectors: 0 to 31)
none
none
All sectors(1) (32 sectors: 0 to 31)
Upper 31/32nds (31 sectors: 1 to 31)
Upper 15/16ths (30 sectors: 2 to 31)
Upper 7/8ths (28 sectors: 4 to 31)
Upper 3/4ths (24 sectors: 8 to 31)
Upper half (16 sectors: 16 to 31)
Lower 32nd (sector 0)
Lower 16th (2 sectors: 0 and 1)
Lower 8th (4 sectors: 0 to 3)
Lower 4th (8 sectors: 0 to 7)
Lower half (16 sectors: 0 to 15)
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