Motorola MPC823e Reference Manual page 1253

MOTOROLA
Simplified mnemonics:
mfxer r D equivalent to
mflr r D equivalent to
mfctr r D equivalent to
In the PowerPC OEA, the SPR field denotes a special-purpose
register, encoded as shown in the table below. The contents of
the designated SPR are placed into r D. SPR[0] = 1 if and only if
reading the register is supervisor-level. Execution of this
instruction specifying a defined and supervisor-level register
when MSR[PR] = 1 will result in a priviledged instruction type
program exception.
If MSR[PR] = 1, the only effect of executing an instruction with
an SPR number that is not shown in the table below and has
SPR[0] = 1 is to cause a supervisor-level instruction type
program exception or an illegal instruction type program
exception. For all other cases, MSR[PR] = 0 or SPR[0] = 0. If the
SPR field contains any value that is not shown in the table, either
an illegal instruction type program exception occurs or the
results are boundedly undefined.
Other registers altered:
• None
1
SPR
DECIMAL SPR[5–9]
1 00000
8 00000
9 00000
18 00000
19 00000
22 00000
26 00000
27 00000
80 00010
81 00010
144 00100
145 00100
MPC823e REFERENCE MANUAL
MPC823e Instruction Set—mfspr
mfspr
mfspr
mfspr
REGISTER
NAME
SPR[0–4]
00001 XER
01000 LR
01001 CTR
10010 DSISR
10011 DAR
10110 DEC
11010 SRR0
11011 SRR1
2
10000 EIE
3
10001 EID
4
10000 CMPA
4
10001 CMPB
r D ,1
r D ,8
r D ,9
ACCESS
User
User
User
Supervisor
Supervisor
Supervisor
Supervisor
Supervisor
Supervisor
Supervisor
Supervisor
Supervisor
B-95