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9-112 PPC405 Core User’s Manual
mfspr
Move From Special Purpose Register
mfspr
Move From Special Purpose Register
SPRN ← SPRF
5:9
|| SPRF
0:4
(RT) ← (SPR(SPRN))
The contents of the SPR specified by the SPRF field are placed into register RT. See “Special
Purpose Registers” on page 10-2 for a listing of SPR mnemonics and corresponding SPRN and
SPRF values.
If instruction bit 31 contains 1, the contents of CR[CR0] are undefined.
Registers Altered
•RT
Invalid Instruction Forms
• Reserved fields
• Invalid SPRF values
Programming Note
Execution of this instruction is privileged if instruction bit 11 contains 1. See “Privileged Mode
Operation” on page 2-30.
The SPR number (SPRN) specified in the assembler language coding of mfspr refers to an SPR
number (see “Special Purpose Registers” on page 10-2 for a list of SPRN values). The assembler
handles the unusual register number encoding to generate the SPRF field. Also, see “Privileged
SPRs” on page 2-32 for information about privileged SPRs.
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
mfspr RT, SPRN
31 RT SPRF 339
0 6 11 21 31