LM3S101 Luminary Micro, Inc., LM3S101 Datasheet - Page 88

• Manufacturer Part Number: LM3S101
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

Internal Memory
88
Reset
Reset
Type
Type
Bit/Field
31:4
Flash Memory Protection Read Enable and Program Enable (FMPRE and FMPPE)
Offset 0x130 and 0x134
3:0
RO
RO
31
15
0
0
Register 1: Flash Memory Protection Read Enable (FMPRE), offset 0x130
Register 2: Flash Memory Protection Program Enable (FMPPE), offset 0x134
Note:
These registers store the read-only (FMPRE) and execute-only (FMPPE) protection bits for each
2 KB flash block. This register is loaded during the power-on reset sequence.
The factory settings for the FMPRE and FMPPE registers are a value of 1 for all implemented
banks. This implements a policy of open access and programmability. The register bits may be
changed by writing the specific register bit. However, this register is R/W0; the user can only
change the protection bit from a 1 to a 0 (and may NOT change a 0 to a 1).
The changes are not permanent until the register is committed (saved), at which point the bit
change is permanent. If a bit is changed from a 1 to a 0 and not committed, it may be restored by
executing a power-on reset sequence.
For additional information, see “Flash Memory Protection” on page 84.
RO
RO
30
14
0
0
reserved
Block3-
Block0
Name
RO
RO
Offset is relative to System Control base address of 0x400FE000
29
13
0
0
RO
RO
28
12
0
0
R/W0
RO
RO
27
11
Type
0
0
RO
RO
RO
26
10
0
0
reserved
RO
RO
25
0
9
0
Preliminary
Reset
0x0F
0
RO
RO
24
0
8
0
reserved
RO
23
RO
0
7
0
Description
Reserved bits return an indeterminate value, and
should never be changed.
Enable 2-KB flash blocks to be written or erased
(FMPPE register), or executed or read (FMPRE
register). The policies may be combined as shown
in Table 7-1 on page 85.
RO
22
RO
0
6
0
RO
RO
21
0
5
0
RO
20
RO
0
4
0
Block3
R/W0
RO
19
0
3
1
Block2
R/W0
RO
18
0
2
1
October 5, 2006
Block1
R/W0
RO
17
0
1
1
Block0
R/W0
RO
16
0
0
1