UM0144 datasheet(30/92 Pages) STMICROELECTRONICS

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3 ST7 Assembler

ST7 Assembler Linker

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UM0144

As you can see, conditionals may be nested—the #ELSE and #ENDIF directive are assumed

to apply to the most recent unterminated #IF.

Other special #IF directives are available as shown in

Table 12.

3.7

Running the assembler

3.7.1

Command line

The assembler needs the following arguments:

ASM <file to assemble>, <listing file>, <switches> [;]

If any or all the arguments are left out of the command line, you'll be prompted for the remaining

arguments.

For example:

ASM

STMicroelectronics - Assembler - rel. 4.44

File to Assemble: game

In the example above, no parameters were given on the command line, so all the parameters

were prompted for.

The <file to assemble> parameter assumes a default suffix ".ASM". For example, if you

type 'game' then 'game.asm' is the actual filename used.

The listing file is the file to which the assembly report is sent if selected. The default filename

(which is displayed in square brackets), is made from the path and base-name of the file to

assemble. The default filename suffix for the assembly report file is ".LST". For instance, if you

type 'game', then 'game.lst' is the actual filename used.

Note that unless the assembler is told to create either a pass-1 or pass-2 complete listing by

the options argument, the listing file will not be created.

Table 12.

Special #If directives

Directive

Usage

#IF1 and #IF2

require no conditional argument. If the appropriate pass is. being assembled, the

condition is considered 'true'; for instance #IF1 will be considered true while the

assembler is in first pass, #IF2 while in the second pass.

#IFDEF

checks for label definition.

#IFB

checks for empty argument (i.e., empty, or containing spaces / tabs), useful for

testing macro parameter existence.

#IFF

(IF False) is similar to #IF, but checks the negation of the condition argument.

#IFIDN

tests for string equality between two arguments separated by a space. This is

useful for testing macro parameters against fixed strings.

#IFLAB

checks if the argument is a predefined label.

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