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Texas Instruments MSP50C614 User Manual

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Individual Instruction Descriptions

4-136

4.14.42

MULSPL

Multiply and Subtract PL From Accumulator

Syntax

[label]

name

dest, src [, mod]

Clock,

clk

Word,

w

With RPT,

clk

Class

MULSPL

A

n, {adrs}

Table 4–46

Table 4–46

1b

MULSPL

A

n[~], An[~] [, next A]

1

1

n

R

+3

3

Execution

[premodify AP if

mod specified]

PH,PL

MR *

src

dest

dest PL

PC

PC + 1

Flags Affected

OF, SF, ZF, CF are set accordingly
src is {adrs}:

TAG bit is set accordingly

Opcode

Instructions

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

MULSPL A

n, {adrs}

0

1

1

1

1

1

1

A

n

adrs

x

dma16 (for direct) or offset16 (long relative) [see section 4.13]

MULSPL A

n[~], An[~], [next A]

1

1

1

0

0

next A

A

n

1

1

0

0

0

0

A~

~A

Description

Perform multiplication of multiply register (MR) and value of

src. The 16 MSBs

of the 32-bit product are stored in the product high (PH) register. The 16 LSBs
of the product (contained in product low (PL) register) are subtracted from
dest. Certain restrictions apply to the use of this instruction when interrupts are
occuring in the background. See Section 4.8 for more details.

Syntax

Description

MULSPL {

adrs}

Multiply MR by RAM word, substract PL to A

n

MULSPL A

n[~], An[~] [, next A]

Multiply MR by An[~] word, substract PL to A

n[~]

See Also

MULSPLS, MULTPL, MULTPLS, MULAPL, MULAPLS

Example 4.14.42.1

MULSPL A0, *R3++

Multiply MR with the contents of R3, subtract PL from accumulator A0. and store result in accumulator
A0 post-increment. Post-increment R3 by 2.

Example 4.14.42.2

MULSPL A2, A2~, ––A

Predecrement accumulator pointer AP2. Multiply MR register to accumulator A2~, subtract PL from
accumulator A2, and store result to accumulator A2.