UM0144 datasheet(21/92 Pages) STMICROELECTRONICS

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ST7 Assembler Linker

3 ST7 Assembler

UM0144

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Operator names longer than one character must be followed by a space character. For

example, '1 AND 2' is correct, '1AND2' is not.

Place the curly braces { } around arithmetic expressions.

Also, always use curly braces at the top-level, when defining a numeric expression. Not doing

so may produce unexpected results.

3.3.4

Comments

Comments are preceded by a semicolon. Characters following a semicolon are ignored by the

assembler.

3.3.5

A source code example

Below is an example of a short source code.

Table 7.

Level 4 operators

Operation

Result, level #4

a-b

a minus b

a+b

a plus b

Wrong syntax:

#define SIZE 128

DS.W SIZE+1

; Wrong, syntax error

#IF SIZE eq 1

; Wrong, same as #IF SIZE

#ENDIF

Correct syntax:

#define SIZE 128

DS.W {SIZE+1}

; OK

#IF {SIZE eq 1}

; OK

#ENDIF

st7/

; small example module showing source formats

ioport

equ $8000

; 8 bit I0 port A

handshake

equ $9000

; write xx here to strobe

segment 'program'

start

ld a,#0

; zero counter

loop

ld ioport,x

; store into ioport

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