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Chapter 32 Register Protection
MPC5606BK Microcontroller Reference Manual, Rev. 2
902
Freescale Semiconductor
a 32-bit wise protected register is shown. When SLBR
n
.WE[0] is set the data written to
SLBR
n
.SLB[0] is automatically written to SLBR
n
.SLB[3:1] also. Otherwise SLBR
n
.SLB[3:0] remains
unchanged.
Figure 32-7. Change lock settings for 32-bit protected addresses
an example is shown that has a mixed protection size configuration:
Figure 32-8. Change lock settings for mixed protection
The data written to SLBR
n
.SLB[0] is mirrored to SLBR
n
.SLB[1] as the corresponding register is 16-bit
protected. The data written to SLBR
n
.SLB[2] is blocked as the corresponding register is unprotected. The
data written to SLBR
n
.SLB[3] is written to SLBR
n
.SLB[3].
32.6.2.2
Enable locking via mirror module space (area #3)
It is possible to enable locking for a register after writing to it. To do so the mirrored module address space
must be used.
shows one example:
1
SLB0
SLB1
SLB2
SLB3
SLBR
n
.WE[3:0]
SLBR.SLB[3:0]
update lock bits
to SLB0
write data
to SLB1 to SLB2 to SLB3
X
X
X
SLB0
SLB1
0
SLB3
SLBR
update lock bits
1
SLBR
n
.WE[3:0]
to SLB0
write data
to SLB1 to SLB2 to SLB3
X
X
1
Содержание MPC5605BK
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