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SUBX
Subtract with Extend
SUBX
Instruction Format:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
0
o
I
0
I
1
REGISTER Rx
SIZE
o
o
I
RIM
I
REGISTER Ry
Instruction Fields:
Register Dy/Ay field -
Specifies the destination register:
If RIM
=
0, specifies a data register.:
t
If RIM
=
1, specifies an address register fer the predecrement addressing mode.
Size field - Specifies the size of the operation:
00 -
Byte operation
01 - Word operation
10 -
Long operation
RIM field -
Specifies the operand addressing mode:
o -
The operation is data register to data register.
1 - The operation is memory to memory.
Register Dx/Ax field - Specifies the source register:
If RIM
=
0, specifies a data register.
If RIM
=
1, specifies an address register for the predecrement addressing mode.
CPU32 REFERENCE MANUAL
INSTRUCTION SET
MOTOROLA
4-157
III
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