[destination] ← [destination] * [source]
MULS <ea>,Dn
MULU <ea>,DnSize word (the product is a longword)
Multiply the 16-bit destination operand by the 16-bit source
operand and store the result in the destination. Both the source and destination are 16-bit word values and the destination result is a 32-bit longword. The product is therefore a correct product and is not truncated. MULU performs multiplication with unsigned values and MULS performs multiplication with two's complement values.
MULU D1,D2 multiplies the low-order words of data registers D1 and D2 and puts the 32-bit result in D2. MULU #$1234,D3 multiplies the low-order word of D3 by the 16-bit literal $1234 and puts the 32-bit result in D3.
| X | N | Z | V | C |
|---|---|---|---|---|
| - | * | * | 0 | 0 |
| Dn | An | (An) | (An)+ | ‑(An) | (d,An) | (d,An,Xi) | ABS.W | ABS.L | (d,PC) | (d,PC,Xn) | imm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.