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2.3.3
Instruction Format
Table 2.9 lists the instruction formats for the source operand and the destination operand. The
meaning of the operand depends on the instruction code. The symbols are used as follows:
•
xxxx: Instruction code
•
mmmm: Source register
•
nnnn: Destination register
•
iiii: Immediate data
•
dddd: Displacement
Table 2.9
Instruction Formats
Instruction Formats
Source
Operand
Destination
Operand
Example
0 format
xxxx
xxxx
xxxx
xxxx
15
0
—
—
NOP
n format
—
nnnn: Direct
register
MOVT Rn
xxxx
xxxx
xxxx
nnnn
15
0
Control register
or system
register
nnnn: Direct
register
STS MACH,Rn
Control register
or system
register
nnnn: Indirect pre-
decrement register
STC.L SR,@-Rn
m format
mmmm: Direct
register
Control register or
system register
LDC Rm,SR
xxxx
mmmm
xxxx
xxxx
15
0
mmmm: Indirect
post-increment
register
Control register or
system register
LDC.L @Rm+,SR
mmmm: Direct
register
—
JMP @Rm
mmmm: PC
relative using Rm
—
BRAF Rm
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