MOTOROLA
Chapter 5. PowerPC Core Register Set
5-7
Part II. PowerPC Microprocessor Module
When an exception is taken, most MSR bits are saved in the SRR1 and the MSR is
reconÞgured with the state of the exception handler using the values in Figure 5-3. This
process is described in Section 7.1.6, ÒException Latency.Ó
After a hard reset, MSR[IP] takes the value speciÞed in hard reset conÞguration word. See
Section 12.3.1.1, ÒHard Reset ConÞguration Word.Ó MSR bits are described in Table 5-8.
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
Ñ
POW
Ñ
ILE
Reset
0000_0000_0000_0000
R/W
R/W
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Field
EE
PR
FP
ME
Ñ
SE
BE
Ñ
IP
IR
DR
Ñ
RI
LE
Reset
0
0
0
0
0
0
0
0
0
Ñ
0
0
Ñ
0
0
R/W
R/W
Figure 5-3.
Machine State Register (MSR)
Table 5-8. MSR Field Descriptions
Bit(s)
Name Description
0Ð12
Ñ
Reserved
13
POW
Power management enable
0 Power management enabled (normal operation mode)
1 Power management disabled (reduced power mode)
Note: Power management functions are implementation-dependent. If the function is not
implemented, this bit is reserved.
14
Ñ
Reserved
15
ILE
Exception little-endian mode. When an exception occurs, this bit is copied into MSR[LE] to select the
endian mode for the context established by the exception.
16
EE
1
External interrupt enable
0 The processor delays recognition of external and decrementer interrupt conditions.
1 The processor is enabled to take an external or decrementer interrupt.
17
Privilege level
0 The processor can execute both user- and supervisor-level instructions.
1 The processor can only execute user-level instructions.
18
Floating-point available.
0 The processor prevents dispatch of ßoating-point instructions, including ßoating-point loads, stores,
and moves.
1 The processor can execute ßoating-point instructions. (This setting is invalid on the MPC860)
19
ME
Machine check enable
0 Machine check exceptions are disabled.
1 Machine check exceptions are enabled.
20 Ñ
Reserved
Summary of Contents for MPC860 PowerQUICC
Page 3: ...MPC860UM AD 07 98 REV 1 MPC860 PowerQUICC ª UserÕs Manual ...
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Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
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Page 114: ...3 16 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 262: ...9 36 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 320: ...12 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
Page 326: ...IV vi MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
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Page 632: ...21 44 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 660: ...22 28 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
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Page 998: ...37 48 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part VI Debug and Test ...
Page 1016: ...A 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1024: ...B 8 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
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