M25PE40-VMP6TP datasheet(16/62 Pages) NUMONYX

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Operating features

M25PE40

16/62

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The second Software Protected mode (SPM2) uses the Block Protect bits (BP2,

BP1, BP0, see Section 6.4.3)) to allow part of the memory to be configured as read-

only.

Table 2.

Software protection truth table (Sectors 0 to 7, 64-Kbyte granularity)

Sector Lock Register

Protection status

Lock

Down bit

Write

Lock bit

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.

Table 3.

Protected area sizes

Status Register

content

Memory content

BP2

bit

BP1

bit

BP0

bit

Protected area

Unprotected area

none

All sectors(1) (eight sectors: 0 to 7)

The device is ready to accept a Bulk Erase instruction if, and only if, all Block Protect bits (BP2, BP1, BP0)

are 0.

Upper eighth (sector 7)

Lower seven-eighths (seven sectors: 0 to 6)

Upper quarter (two sectors: 6 and

Lower three-quarters (six sectors: 0 to 5)

Upper half (four sectors: 4 to 7)

Lower half (four sectors: 0 to 3)

All sectors (eight sectors: 0 to 7)

none

All sectors (eight sectors: 0 to 7)

none

All sectors (eight sectors: 0 to 7)

none

All sectors (eight sectors: 0 to 7)

none

M25PE40-VMP6TP Datasheet(PDF) 16 Page - Numonyx B.V

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