Motorola CPU32 Reference Manual page 73

ADDX
Instruction Fields:
Register Rx field — Specifies the destination register:
If R/M = 0, specifies a data register.
If R/M = 1, specifies an address register for 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 address mode:
0 — The operation is data register to data register.
1 — The operation is memory to memory.
Register Ry field — Specifies the source register:
If R/M = 0, specifies a data register.
If R/M = 1, specifies an address register for predecrement addressing mode.
CPU32
REFERENCE MANUAL
Add Extended
INSTRUCTION SET
ADDX
MOTOROLA
4-25