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25PE20VP Datasheet(PDF) 16 Page - STMicroelectronics

Part # 25PE20VP
Description  1 and 2 Mbit, low voltage, Page-Erasable Serial Flash memories with Byte-Alterability, 50 MHz SPI bus, standard pinout
PDF  60 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

25PE20VP Datasheet(HTML) 16 Page - STMicroelectronics

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Operating features
M25PE20, M25PE10
16/60
●
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 2.
Software protection truth table (Sectors 0 to 3 for M25PE20 or sectors 0
to 1 for M25PE10, 64-Kbyte granularity)
Sector Lock Register
Protection status
Lock
Down bit
Write
Lock bit
00
Sector unprotected from Program/Erase/Write operations, Protection status
reversible
01
Sector protected from Program/Erase/Write operations, Protection status
reversible
10
Sector Unprotected from Program/Erase/Write operations,
Sector Protection Status cannot be changed except by a Reset or Power-up.
11
Sector Protected from Program/Erase/Write operations,
Sector Protection Status cannot be changed except by a Reset or Power-up.
Table 3.
Protected area sizes for M25PE20
Status Register
content
Memory content
BP1 Bit BP0 Bit
Protected area
Unprotected area
0
0
none
All sectors(1) (four sectors: 0 to 3)
1.
The device is ready to accept a Bulk Erase instruction if, and only if, all Block Protect bits (BP1, BP0) are 0.
0
1
Upper quarter (Sector 3)
Lower three quarters (three sectors: 0 to 2)
1
0
Upper half (two sectors: 2 and 3)
Lower half (two sectors: 0 to 1)
1
1
All sectors (four sectors: 0 to 3)
none
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)
1.
The device is ready to accept a Bulk Erase instruction if, and only if, all Block Protect bits (BP1, BP0) are 0.
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



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