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Chapter 32 Register Protection
MPC5606BK Microcontroller Reference Manual, Rev. 2
898
Freescale Semiconductor
32.5.2
Register description
32.5.2.1
Module Registers (MR0-6143)
This is the lower 6 KB module memory space that holds all the functional registers of the module that is
protected by the Register Protection module.
32.5.2.2
Module Register and Set Soft Lock Bit (LMR0-6143)
This is memory area #3 that provides mirrored access to the MR0-6143 registers with the side effect of
setting soft lock bits in case of a write access to a MR that is defined as protectable by the locking
mechanism. Each MR is protectable by one associated bit in a SLBR
n
.SLB
m
, according to the mapping
described in
.
32.5.2.3
Soft Lock Bit Register (SLBR0-1535)
These registers hold the soft lock bits for the protected registers in memory area #1.
gives some examples how SLBR
n
.SLB and MR
n
go together.
Address 0x3800-0x3DFF
Access: Read always
Supervisor write
0
1
2
3
4
5
6
7
R
0
0
0
0
SLB0
SLB1
SLB2
SLB3
W
WE0
WE1
WE2
WE3
Reset
0
0
0
0
0
0
0
0
Figure 32-3. Soft Lock Bit Register (SLBR
n
)
Table 32-2. SLBR
n
field descriptions
Field
Description
WE0
WE1
WE2
WE3
Write Enable Bits for soft lock bits (SLB):
WE0 enables writing to SLB0
WE1 enables writing to SLB1
WE2 enables writing to SLB2
WE3 enables writing to SLB3
1 Value is written to SLB
0 SLB is not modified
SLB0
SLB1
SLB2
SLB3
Soft lock bits for one MR
n
register:
SLB0 can block accesses to MR[
n
× 4 + 0]
SLB1 can block accesses to MR[
n
× 4 + 1]
SLB2 can block accesses to MR[
n
× 4 + 2]
SLB3 can block accesses to MR[
n
× 4 + 3]
1 Associated MR
n
byte is locked against write accesses
0 Associated MR
n
byte is unprotected and writable
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