UM0144 datasheet(17/92 Pages) STMICROELECTRONICS

17 / 92 page

ST7 Assembler Linker

3 ST7 Assembler

UM0144

17/92

As a short cut, labels may be declared as PUBLIC by preceding them with a '.' at their

definition. If this is done the label name need not be given in a PUBLIC directive. For example,

the following code fragment declares the label 'lab4' as PUBLIC automatically:

3.3.2

About opcodes

The Opcode field may serve three different purposes. It may contain:

●

The opcode mnemonic for an assembly instruction,

●

The name of a directive,

●

The name of a macro to be invoked.

Opcodes must be separated from the preceding field (i.e. label, if there is one) by a space or a

tab.

A comprehensive Opcode description can be found in the

ST7 Programming Manual.

Macros are discussed in

Section 3.5 on page 26.

Directives are discussed in on page 48.

3.3.3

About operands

Operands may be any of the following:

●

Numbers and addresses,

●

String and character constants,

●

Program Counter references,

●

Expressions.

The following paragraphs explain how to use these types of operands.

Number and address representation

By default, the representation of numbers and addresses follows the MOTOROLA syntax.

When you want to use hexadecimal number with instructions or labels, they must be preceded

by $. When nothing is specified, the default base is decimal.

For example:

lab3

ld A,#0

ret

.lab4

nop

ret

lab03

equ 10

; decimal 10

lab04

equ $10

; hexadecimal 10

ld A,$ffff

; long addressing mode

ld A,#$cb

; immediate addressing mode

ld A,#100

; decimal representation

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