Chapter 8 Writing Source Statements
142 Expressions
8.7.4
Expression Attributes
When expression operands are connected by an operator, the calculated result of the expression will
have attributes of the operands and the operator.
The most important attributes for expression evaluation are as follows.
•
Undefined (undefined-UND)
•
Absolute (absolute-ABS)
•
External (external-EXT)
•
Relative (relocate-REL)
Operation result attributes
The operation result attributes for the label itself or the labels are following four.
•
UND: undefined attributes
The label is undefined at the reference.
•
ABS: absolute attributes
The label is undefined with equ pseudo instruction. The value is not changed. The constant
value written directly will be regarded as an absolute attribute.
•
REL: relative attributes
The label is already defined in the same file at the reference (the label referring forward).
•
EXT: external reference attributes
The label is declared with global pseudo instruction and defined by another file.
The rules for connecting attributes are as follows.
For ~, +, – (unary) operators
Attribute of Operand
Attribute of Result
UND
UND
ABS
ABS
REL
REL
EXT
EXT
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 ...