Chapter 10 Writing Assembler Control Statements
Conditional Assembly 189
10.4 Conditional Assembly
The cross assembler provides conditional assembly capabilities. The directives explained in this
section are provided for this purpose.
By coding conditional assembly directives in a program, the assembler will select which block to
assemble by judging the specified conditions at the time of assembly.
Many conditional assembly directives are used only within macro definitions.
The actual program structure of conditional assembly is shown below.
NOTE:
The contents of brackets [ ] from #else on can be omitted.
The basic function of conditional assembly directives are for the assembler to evaluate the condition
specified by #if, and then to select the block to assemble based on the result.
Conditional assembly directives are used for the following purposes.
•
Different object code for different versions can be output with a single source program.
•
Machine language instructions differ depending on the device type.
•
Conditional assembly directives can be included in programs being debugged.
#if
expression, identifier, parameter, etc.
block1 to be
assembled if condition is true
[#else
block 2 to be
assembled if condition is false]
#endif
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 ...