HCS12 datasheet(178/452 Pages) FREESCALE

178 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

178

Freescale Semiconductor

Operation:

(D)

× (Y) ⇒ Y : D

Description:

A signed 16-bit value is multiplied by a signed 16-bit value to produce a

signed 32-bit result. The first source operand must be loaded into 16-bit

double accumulator D, and the second source operand must be loaded into

index register Y before executing the instruction. When the instruction is

executed, D is multiplied by the value Y. The 16 high-order bits of the 32-bit

result are stored in Y and the 16 low-order bits of the result are stored in D.

The C status bit can be used to round the high-order 16 bits of the result.

EMULS

Extended Multiply

16-Bit by 16-Bit (Signed)

EMULS

CCR Details:

HIN

––––

∆∆

–

∆

N: Set if the MSB of the result is set; cleared otherwise

Z: Set if result is $00000000; cleared otherwise

C: Set if bit 15 of the result is set; cleared otherwise

Source Form

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

EMULS

INH

18 13

OfO

OffO

(1)

1. EMULS has an extra free cycle if it is followed by another PAGE TWO instruction.

OfO

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