Instructions
M25PE80
(1)
Table 11. Not for new design: lock registers for the M25PE80 in T7Y process
Bit
Bit name
Value
Function
b7-b4
Reserved
This functionality must not be used for new designs, as the
M25PE80 delivered from Feb 2007 will not offer this functionality.
‘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.
Subsector lock
down(2)
b3
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
‘0’
values to them (default value).
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
‘1’
executed. The memory contents will not be changed.
Subsector write
lock(2)
b2
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
‘0’
executed and will modify the subsector contents (default value).
The write lock and lock down bits cannot be changed. Once a ‘1’
‘1’ is written to the lock down bit it cannot be cleared to ‘0’, except by
a reset or power-up.
b1
b0
Sector lock down
Sector write lock
The write lock and lock down bits can be changed by writing new
values to them (default value).
‘0’
Write, program and erase operations in this sector will not be
executed. The memory contents will not be changed.
‘1’
Write, program and erase operations in this sector are executed
and will modify the sector contents (default value).
‘0’
1. See: Important note on page 6.
2. Valid only for sector 0 and sector 15 (the value ‘0’ is returned for other sectors).
Figure 14. Read lock register (RDLR) instruction sequence and data-out sequence
S
0
1
2
3
4
5
6
7
8
9
10
28 29 30 31 32 33 34 35 36 37 38 39
C
Instruction
24-bit address
23 22 21
MSB
3
2
1
0
D
Q
Lock register out
High Impedance
2
7
6
5
4
3
1
0
MSB
AI10783
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NUMONYX [ NUMONYX B.V ]
