Chapter 9 Writing Machine Language Instructions and Directive Statements
Writing Directive Statements 167
9.4.11 ds
Syntax
label
operation
operand
[name]
ds
expression1 [, expression2 [, expression3]]
expression1
Number of bytes of memory to reserve
expression2
Initial value
expression3
Number of iterations
Default settings
expression2 (initial value) If omitted, the assembler will assume 0.
expression3 (iterations) If omitted, the assembler will assume 1.
Functional description
This directive reserves a memory area of the number of bytes specified by expression1 of the operand.
When expression2 (initial value) is specified, that memory area will be filled with the initial value.
Note that expression2 can be specified only when the value of expression1 is 4 or less. When
expression3 (iterations) is specified, the same specification will be repeated for the number of
iterations. For example, if the operand is 4, 0, 3, a 4-byte area will be filled with 0 three times. Thus, a
12-byte area will be reserved.
When a name is coded for the label, the assembler will assign the current location counter value to that
name.
Operand coding rules
The expression1 (bytes), expression2 (initial value), and expression3 (iterations) coded in the operand
must result in the attribute abs (absolute). Refer to section 8.7.4, "Expression Attributes", regarding
attributes of expressions.
NOTE:
When expression2 is omitted, expression3 cannot be specified.
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 ...