M25PE80-VMP6TP datasheet(37/61 Pages) STMICROELECTRONICS

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M25PE80

Instructions

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For products processed in the T7Y process only (see Important note):

Protection always prevails:

●

When the Lock Down Bit of Sector 0 or Sector 15 is set to ‘1’.

–

If the Lock Down Bit of Sector 0 is ‘1’, all the Lock Down Bits of the subsectors in

Sector 0 are forced to ‘1’.

–

If the Lock Down Bit of Sector 15 is ‘1’, all the Lock Down Bits of the subsectors in

Sector 15 are forced to ‘1’

●

When the Write Lock Bit of Sector 0 or Sector 15 is set to ‘1’.

–

if the Write Lock Bit of Sector 0 is ‘1’, the Write Lock Bits of all the subsectors in

Sector 0 are forced to ‘1’ (even if their Lock Down Bits are set to ‘1’).

–

if the Write Lock Bit of Sector 15 is ‘1’, the Write Lock Bits of all the subsectors in

Sector 15 are forced to ‘1’ (even if their Lock Down Bits are set to ‘1’).

●

When the Write Lock Bit of Sector 0 or Sector 15 is reset to ‘0’.

–

if the Write Lock Bit of Sector 0 is ‘0’, all the subsectors in Sector 0 whose Lock

Down Bit is ‘0’ have their Write Lock Bits forced to ‘0’.

–

if the Write Lock Bit of Sector 15 is ‘0’, all the subsectors in Sector 15 whose Lock

Down Bit is ‘0’ have their Write Lock Bits forced to ‘0’.

●

When the Write Lock Bit of any sector or subsector is set to ‘1’, any instruction that may

modify the contents of this sector or subsector will be rejected (including Sector Erase

and Bulk Erase).

Note that when the WRLR instruction acts both on Write Lock (WL) and Lock Down (LD)

bits, it firstly programs the WL bit, and then the LD bit.

As an example, if a subsector Lock Register settings are xxxx0101b and a WRLR instruction

is issued with a Lock Register In data set to 00000010b:

the sector WL bit is first set to ‘0’ (and all subsectors that are not locked-down will have

their WL bit reset to ‘0’).

the sector LD bit and all subsectors LD bits are set to ‘1’. In this case, the final value of

the above subsector Lock Register is xxxx1010b.

Table 13.

Not for new design: Lock Registers for the M25PE80 in T7Y process(1)

The table rows in gray are true for products processed in the T7Y process only.

Sector

Bit

Value

All Sectors in T9HX process

All Sectors except for Sector 0

and Sector 15 in T7Y process

b7-b2

‘0’

Sector Lock Down Bit Value (refer to Table 11)

Sector Write Lock Bit Value (refer to Table 11)

Sector 0, Sector 15 in T7Y

process

‘1’

Only b3 and b2 are taken into account to modify

the subsector Write Lock and Lock Down bits(2)

b6-b4 and b1-b0 must be reset to ‘0’.

‘0’

Only b1 and b0 are taken into account to modify

the sector Write Lock and Lock Down bits(3)

b6-b2 must be reset to ‘0’.

Subsector Lock Down Bit value (refer to Table 11)

Subsector Write Lock Bit Value (refer to Table 11)

Sector Lock Down Bit Value (refer to Table 11)

Sector Write Lock Bit Value (refer to Table 11)

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