M25P05 datasheet(6/32 Pages) STMICROELECTRONICS

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Table 2. Protected Area Sizes

Protection Modes

The environments where non-volatile memory de-

vices are used can be very noisy. No SPI device

can operate correctly in the presence of excessive

noise. To help combat this, the M25P05 boasts the

following data protection mechanisms:

Power-On Reset and an internal timer (tPUW)

can provide protection against inadvertant

changes while the power supply is outside the

operating specification.

Program, Erase and Write Status Register

instructions are checked that they consist of a

number of clock pulses that is a multiple of

eight, before they are accepted for execution.

All instructions that modify data must be

preceded by a Write Enable (WREN) instruction

to set the Write Enable Latch (WEL) bit . This bit

is returned to its reset state by the following

events:

– Power-up

– Write Disable (WRDI) instruction completion

– Write Status Register (WRSR) instruction

completion

– Page Program (PP) instruction completion

– Sector Erase (SE) instruction completion

– Bulk Erase (BE) instruction completion

The Block Protect (BP1, BP0) bits allow part of

the memory to be configured as read-only. This

is the Software Protected Mode (SPM).

The Write Protect (W) signal, in co-operation

with the Status Register Write Disable (SRWD)

bit, allows the Block Protect (BP1, BP0) bits and

Status Register Write Disable (SRWD) bit to be

write-protected. This is the Hardware Protected

Mode (HPM).

In addition to the low power consumption

feature, the Deep Power-down mode offers

extra software protection from inadvertant

Write, Program and Erase instructions, as all

instructions are ignored except one particular

instruction (the Release from Deep Power-

down instruction).

Figure 6. Hold Condition Activation

Status Register

Content

Memory Content

BP1 Bit

BP0 Bit

Protected Area

Unprotected Area

none

All sectors (Sectors 0 and 1)

No protection against Page Program (PP) and Sector Erase (SE)

All sectors (Sectors 0 and 1) protected against Bulk Erase (BE)

All sectors (Sectors 0 and 1)

none

AI02029C

HOLD

Active

Hold

Active

Hold

Active

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