M25PE80 datasheet(31/61 Pages) STMICROELECTRONICS

31 / 61 page

M25PE80

Instructions

31/61

Figure 14.

Read Lock Register (RDLR) instruction sequence and data-out Sequence

Table 11.

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

(see Important note on page 6)

Bit

Bit Name

Value

Function

b7-b4

Reserved

Subsector Lock

Down(1)

Valid only for sector 0 and sector 15 (the value ‘0’ is returned for other sectors).

‘1’

This functionality must not be used for new designs, as the

M25PE80 delivered from Feb 2007 will not offer this functionality.

The Write Lock and Lock Down Bits cannot be changed. Once a

‘1’ is written to the Lock Down Bit it cannot be cleared to ‘0’ except

by a Reset or power-up.

‘0’

This functionality must not be used for new designs, as the

M25PE80 delivered from Feb 2007 will not offer this functionality.

The Write Lock and Lock Down Bits can be changed by writing

new values to them. (Default value).

Subsector Write

Lock(1)

‘1’

This functionality must not be used for new designs, as the

M25PE80 delivered from Feb 2007 will not offer this functionality.

Write, Program and Erase operations in this subsector will not be

executed. The memory contents will not be changed.

‘0’

This functionality must not be used for new designs, as the

M25PE80 delivered from Feb 2007 will not offer this functionality.

Write, Program and Erase operations in this subsector are

executed and will modify the subsector contents. (Default value).

Sector Lock

Down

‘1’

The Write Lock and Lock Down Bits cannot be changed. Once a

‘1’ is written to the Lock Down Bit it cannot be cleared to ‘0’,

except by a Reset or power-up.

‘0’

The Write Lock and Lock Down Bits can be changed by writing

new values to them. (Default value).

Sector Write

Lock

‘1’

Write, Program and Erase operations in this sector will not be

executed. The memory contents will not be changed.

‘0’

Write, Program and Erase operations in this sector are executed

and will modify the sector contents. (Default value).

AI10783

3456789 10

28 29 30 31 32 33 34 35

22 21

3210

36 37 38

76543

High Impedance

Lock Register Out

Instruction

24-Bit Address

MSB

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