Motorola MPC823e Reference Manual page 1199

MOTOROLA
Modified block—Copies the block to memory. Invalidates
the block in the processor's data cache.
Absent block (target block not in cache)—No action is
taken.
The function of this instruction is independent of the write-
through, write-back and caching-inhibited /allowed modes of the
block containing the byte addressed by EA.
This instruction may be treated as a load from the addressed
byte with respect to address translation and memory protection.
It may also be treated as a load for referenced and changed bit
recording except that referenced and changed bit recording may
not occur.
Other registers altered:
• None
POWERPC ARCHITECTURE
LEVEL
UISA
MPC823e REFERENCE MANUAL
MPC823e Instruction Set—dcbf
SUPERVISOR OPTIONAL
LEVEL
FORM
X
B-41