M25PE20 Numonyx, B.V., M25PE20 Datasheet - Page 16

• Manufacturer Part Number: M25PE20
• Description: 1 and 2 Mbit, page-erasable serial Flash memories with byte alterability, 75 MHz SPI bus, standard pinout
• Manufacturer: Numonyx, B.V.

Operating features
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Table 2.
●
Table 3.
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.
1. The device is ready to accept a Bulk Erase instruction if, and only if, all block protect bits (BP1, BP0) are 0.
Sector Lock Register
BP1 bit BP0 bit
BP1 bit BP0 bit
Down bit
Status Register
Status Register
Lock
0
0
1
1
0
0
1
1
0
0
1
1
The second Software Protected mode (SPM2) uses the block protect (BP1, BP0, see
Section
content
content
Lock bit
0
1
0
1
0
1
0
1
Software protection truth table (sectors 0 to 3 for M25PE20 or sectors 0
to 1 for M25PE10, 64-Kbyte granularity)
Protected area sizes for M25PE20
Protected area sizes for M25PE10
6.4.3)) bits to allow part of the memory to be configured as read-only.
Write
0
1
0
1
none
Upper quarter (sector 3)
Upper half (two sectors: 2 and 3)
All sectors (four sectors: 0 to 3)
none
Upper half (1 sector: sector 1)
Upper half (1 sector: sector 1)
All sectors (two sectors: 0 and 1)
Sector unprotected from program/erase/write operations, protection status
reversible
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 reset or power-up.
Sector protected from program/erase/write operations,
Sector protection status cannot be changed except by a reset or power-up.
Protected area
Protected area
Memory content
Memory content
Protection status
All sectors
Lower three quarters (three sectors: 0 to 2)
Lower half (two sectors: 0 to 1)
none
All sectors
Lower half (one sector: sector 0)
Lower half (one sector: sector 0)
none
(1)
(1)
Unprotected area
Unprotected area
(four sectors: 0 to 3)
(two sectors: 0 and 1)
M25PE20, M25PE10