Panasonic MN1030 User Manual

Chapter 10   Writing Assembler Control Statements

188  Identifier Definement

10.3.2 #undef

Syntax

#undef

identifier

Functional description

This directive deletes an identifier defined by a #define directive. The effective range of an identifier is 

from the line following #define until the line before #undef.

To redefine the replacement string of an identifier, redefine it with #define after performing an #undef.

Coding rules

The identifier for an #undef directive must be the same string as the identifier for the corresponding 

#define directive. The string is case sensitive.

Usage example

A source file that uses #undef is shown below.

#define

data1

0x11

#define

data2

0x22

_CODE

section

CODE, PUBLIC, 2

mov

data1, D0

mov

data2, D1

#undef

data1

mov

data1, D0

#undef

data2

#define

data1     0x33

#define

data2     0x44

mov

data1, D0

mov

data2, D1

end