Table of Contents
Advertisement
SUBX
Instruction Format:
15
14
13
1
0
0
Instruction Fields:
Register Dy/Ay field — Specifies the destination register:
If R/M = 0, specifies a data register.
If R/M = 1, specifies an address register for the predecrement addressing
mode.
Size field — Specifies the size of the operation:
00 — Byte operation
01 — Word operation
10 — Long operation
R/M field — Specifies the operand addressing mode:
0 — The operation is data register to data register.
1 — The operation is memory to memory.
Register Dx/Ax field — Specifies the source register:
If R/M = 0, specifies a data register.
If R/M = 1, specifies an address register for the predecrement addressing
mode.
MOTOROLA
4-152
Subtract with Extend
12
11
10
9
1
REGISTER Rx
INSTRUCTION SET
8
7
6
5
1
SIZE
0
SUBX
4
3
2
1
0
R/M
REGISTER Ry
CPU32
REFERENCE MANUAL
0
Advertisement
Table of Contents
