Chapter 10 Writing Assembler Control Statements
Conditional Assembly 191
10.4.1 #ifdef, #ifndef
Syntax
Syntax for #ifdef
Syntax for #ifndef
#ifdef
identifier
#ifndef
identifier
block1
block1
[#else
[#else
block2]
block2]
#endif
#endif
Functional description
#ifdef
If the identifier has been defined by a #define directive before the #ifdef statement, block1 will be
assembled. If it has not been defined and an #else directive has been coded, block2 will be assembled.
#ifndef
If the identifier has not been defined by a #define directive before the #ifndef statement, block1 will be
assembled. If it has been defined and an #else directive has been coded, block2 will be assembled.
Coding rules
These directives can be used within macro definitions and wherever machine language instructions can
be coded.
If an identifier is defined after #ifdef or #ifndef, it will be considered undefined.
Identifiers can be specified by the D option when the assembler is started, even if they are not defined
with #define directives.
Содержание PanaXSeries MN1030 Series
Страница 1: ...MICROCOMPUTER MN1030 MN1030 Series Cross Assembler User s Manual Pub No 13110 120E ...
Страница 2: ......
Страница 13: ...1 Chapter 1 Getting Started ...
Страница 25: ...2 Chapter 2 Program Development Flow ...
Страница 32: ...Chapter 2 Program Development Flow 20 Programming with Assembler ...
Страница 33: ...3 Chapter 3 Introduction to Operation ...
Страница 54: ...Chapter 3 Introduction to Operation 42 Conditional Assembly and Linking ...
Страница 55: ...4 Chapter 4 Optimization ...
Страница 71: ...5 Chapter 5 Using Assembler ...
Страница 95: ...6 Chapter 6 Using Linker ...
Страница 128: ...Chapter 6 Using Linker 116 Instruction RAM Support ...
Страница 129: ...7 Chapter 7 Types of Source Statements ...
Страница 138: ...Chapter 7 Type of Source Statements 126 Blank Statements ...
Страница 139: ...8 Chapter 8 Writing Source Statements ...
Страница 157: ...9 Chapter 9 Writing Machine Language Instruction Statements and Directive Statements ...
Страница 192: ...Chapter 9 Writing Machine Language Instructions and Directive Statements 180 Writing Directive Statements ...
Страница 193: ...10 Chapter 10 Writing Assembler Control Statements ...
Страница 217: ...11 Chapter 11 Writing Macro Control Statements ...
Страница 236: ...Chapter 11 Writing Macro Control Statements 224 irpc ...
Страница 237: ...12 Chapter 12 List of Machine Language Instructions ...
Страница 261: ...13 Chapter 13 Error Messages ...
Страница 276: ...Chapter 13 Error Messages 264 Linker Errors ...
Страница 277: ...14 Chapter 14 Readinig List Files ...
Страница 285: ...15 Chapter 15 Using Library Manager ...
Страница 309: ...16 Chapter 16 Notes on Operating Environment ...
Страница 321: ...17 Chapter 17 Appendix ...
Страница 338: ... 4 Index ...