MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
13-13
NOTE
In the event that blocks are not present (due to configuration or total
memory size), the LOCK bits will default to locked, and will not be
writable. The reset value will always be 1 (independent of the shadow
block), and register writes will have no effect.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R LME
0
0
0
0
0
0
0
0
0
0
SLOCK
1
1
MLOCK
W
Reset
0
0
0
0
0
0
0
0
0
0
0
1
1
1
Reg Addr
Base (0xC3F8_8000) + 0x0004
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
1
1
1
1
1
1
1
1
1
1
LLOCK
W
Reset
1
1
1
1
1
1
1
Reg Addr
Base (0xC3F8_8000) + 0x0004
1
The reset value of these bits is determined by flash values in the shadow row. An erased array will cause
the reset value to be 1
Figure 13-6. Low-/Mid-Address Space Block Locking Register (FLASH_LMLR)
Table 13-8. FLASH_LMLR Field Descriptions
Bits
Name
Description
0
LME
Low- and mid-address lock enable. Enables the locking register fields (SLOCK, MLOCK
and LLOCK) to be set or cleared by register writes. This bit is a status bit only, and may not
be written or cleared, and the reset value is 0. The method to set this bit is to write a
password, and if the password matches, the LME bit will be set to reflect the status of
enabled, and is enabled until a reset operation occurs. For LME, the password
0xA1A1_1111 must be written to the FLASH_LMLR.
0 Low- and mid-address locks are disabled, and cannot be modified.
1 Low- and mid-address locks are enabled and can be written.
1–10
—
Reserved.
11
SLOCK
Shadow lock. Locks the shadow row from programs and erases. The SLOCK bit is not
writable if a high voltage operation is suspended.
Upon reset, information from the shadow row is loaded into the SLOCK bit. The SLOCK bit
may be written as a register. Reset will cause the bits to go back to their shadow row value.
The default value of the SLOCK bit (assuming the corresponding shadow row bit is erased)
would be locked. SLOCK is not writable unless LME is high.
0 Shadow row is available to receive program and erase pulses.
1 Shadow row is locked for program and erase.
12–13
—
Reserved.
Summary of Contents for MPC5553
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