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Chapter 21 Memory Protection Unit (MPU)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
379
21.5.2
Register description
21.5.2.1
MPU Control/Error Status Register (MPU_CESR)
The MPU_CESR provides one byte of error status plus three bytes of configuration information. A global
MPU enable/disable bit is also included in this register.
Offset: 0x000
Access: Read/Partial Write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
SPERR[0:2]
0
0
0
0
0
1
0
0
0
HRL
W w1c
w1c
w1c
Reset
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
NSP
NRGD
0
0
0
0
0
0
0
VLD
W
Reset
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Figure 21-2. MPU Control/Error Status Register (MPU_CESR)
Table 21-2. MPU_CESR field descriptions
Field
Description
SPERR
n
Slave Port
n
Error, where the slave port number matches the bit number. See
.
Each bit in this field represents a flag maintained by the MPU for signaling the presence of a captured
error contained in the MPU_EAR
n
and MPU_EDR
n
registers. The individual bit is set when the
hardware detects an error and records the faulting address and attributes. It is cleared when the
corresponding bit is written as a logical one. If another error is captured at the exact same cycle as a
write of a logical one, this flag remains set. A “find first one” instruction (or equivalent) can be used to
detect the presence of a captured error.
0 The corresponding MPU_EAR
n
/MPU_EDR
n
registers do not contain a captured error.
1 The corresponding MPU_EAR
n
/MPU_EDR
n
registers do contain a captured error.
HRL
Hardware Revision Level
This field specifies the MPU’s hardware and definition revision level. It can be read by software to
determine the functional definition of the module.
NSP
Number of Slave Ports
This field specifies the number of slave ports [1–8] connected to the MPU.
NRGD
Number of Region Descriptors
This field specifies the number of region descriptors implemented in the MPU. The defined encodings
include:
0000 8 region descriptors
0001 12 region descriptors
0010 16 region descriptors
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