Chapter 31.

MSP 430 Dependent Features

31.1. Options

as

has only  m flag which selects the mpu arch. Currently has no effect.

31.2. Syntax

31.2.1. Macros

The macro syntax used on the MSP 430 is like that described in the MSP 430 Family Assembler

Specification. Normal

as

macros should still work.

Additional built in macros are:

llo(exp)

Extracts least significant word from 32 bit expression 'exp'.

lhi(exp)

Extracts most significant word from 32 bit expression 'exp'.

hlo(exp)

Extracts 3rd word from 64 bit expression 'exp'.

hhi(exp)

Extracts 4rd word from 64 bit expression 'exp'.

They normally being used as an immediate source operand.

mov #llo(1), r10 ; == mov #1, r10

mov #lhi(1), r10 ; == mov #0, r10

31.2.2. Special Characters

;

is the line comment character.

The character

$

in jump instructions indicates current location and implemented only for TI syntax

compatibility.

31.2.3. Register Names

General purpose registers are represented by predefined symbols of the form

rN

(for global registers),

where

N

represents a number between

0

and

15

. The leading letters may be in either upper or lower

case; for example,

r13

and

R7

are both valid register names.