Epson ARM720T User Manual
2: Programmer’s Model
ARM720T CORE CPU MANUAL
EPSON
2-17
2.11
Implementation-defined behavior of instructions
The
ARM Architecture Reference Manual
defines the instruction set of the ARM720T
processor:
•
See
identified as implementation-defined in the
ARM Architecture Reference Manual
.
•
See
for those features that define signed and unsigned early
termination on the ARM720T processor.
2.11.1
Indexed addressing on a Data Abort
In the event of a Data Abort with pre-indexed or post-indexed addressing, the value left in Rn
is defined to be the updated base register value for the following instructions:
•
LDC
•
LDM
•
LDR
•
LDRB
•
LDRBT
•
LDRH
•
LDRSB
•
LDRSH
•
LDRT
•
STC
•
STM
•
STR
•
STRB
•
STRBT
•
STRH
•
STRT.
2.11.2
Early termination
On the ARM720T, early termination is defined as:
MLA, MUL
Signed early termination.
SMULL, SMLAL
Signed early termination.
UMULL, UMLAL
Unsigned early termination.