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mtmsr
Assembler Syntax
BIT
0
1
2
FIELD
31
BIT
16
17
18
FIELD
00000
Definition
Operation
Description
MOTOROLA
mtmsr
rS
3
4
5
6
7
19
20
21
22
23
Move to Machine State Register
MSR ← (rS)
The contents of rS are placed into the MSR. This is a supervisor
level instruction. It is also an execution synchronizing instruction
except with respect to alterations to the POW and LE bits.
In addition, alterations to the MSR[EE] and MSR[RI] bits are
effective as soon as the instruction completes. Thus if MSR[EE]
= 0 and an external or decrementer exception is pending,
executing an mtmsr instruction that sets MSR[EE] = 1 will cause
the external or decrementer exception to be taken before the
next instruction is executed, if no higher priority exception exists.
Other registers altered:
MSR
POWERPC ARCHITECTURE
LEVEL
OEA
MPC823e REFERENCE MANUAL
MPC823e Instruction Set—mtmsr
8
9
10
11
12
S
00000
24
25
26
27
28
146
SUPERVISOR
OPTIONAL
LEVEL
√
13
14
15
29
30
31
0
FORM
X
B-101
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