Panasonic MN1030 User Manual

Chapter 10 Writing Assembler Control Statements

Identifier Definement 187

10.3.1 #define

Syntax

#define

[replacement_string] [; comment]

Functional description

This directive causes the assembler to replace the identifier with the replacement_string on all further

lines.

The #define directive differs from the #equ directive in that a string can be specified. Furthermore,

when used in conjunction with the #undef directive, redefinition is possible.

Coding rules

Any string can be coded for the replacement_string. The string can include spaces and tabs. If the

replacement_string is omitted, the identifier will be defined as a null character.

Everything after a semicolon (;) is considered a comment. Therefore semicolons cannot be included in

the replacement_string.

The same identifier cannot just be redefined with another #define directive. When used in conjunction

with the #undef directive, redefinition is possible. Refer to section 10.4, "#undef", for details.

If the replacement_string is omitted, the identifier will be defined as a null character.

Usage example

Source file contents are shown below. The first line replaces data with the character 5. The next line is

an example of changing a mnemonic, so mov data,D0 can be coded as load.

#define

data

#define

load

mov

data, D0

_CODE

section

CODE, PUBLIC,2

main

mov

data, D0

load

end