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.
Summary of Contents for PanaXSeries MN1030 Series
Page 1: ...MICROCOMPUTER MN1030 MN1030 Series Cross Assembler User s Manual Pub No 13110 120E ...
Page 2: ......
Page 13: ...1 Chapter 1 Getting Started ...
Page 25: ...2 Chapter 2 Program Development Flow ...
Page 32: ...Chapter 2 Program Development Flow 20 Programming with Assembler ...
Page 33: ...3 Chapter 3 Introduction to Operation ...
Page 54: ...Chapter 3 Introduction to Operation 42 Conditional Assembly and Linking ...
Page 55: ...4 Chapter 4 Optimization ...
Page 71: ...5 Chapter 5 Using Assembler ...
Page 95: ...6 Chapter 6 Using Linker ...
Page 128: ...Chapter 6 Using Linker 116 Instruction RAM Support ...
Page 129: ...7 Chapter 7 Types of Source Statements ...
Page 138: ...Chapter 7 Type of Source Statements 126 Blank Statements ...
Page 139: ...8 Chapter 8 Writing Source Statements ...
Page 157: ...9 Chapter 9 Writing Machine Language Instruction Statements and Directive Statements ...
Page 193: ...10 Chapter 10 Writing Assembler Control Statements ...
Page 217: ...11 Chapter 11 Writing Macro Control Statements ...
Page 236: ...Chapter 11 Writing Macro Control Statements 224 irpc ...
Page 237: ...12 Chapter 12 List of Machine Language Instructions ...
Page 261: ...13 Chapter 13 Error Messages ...
Page 276: ...Chapter 13 Error Messages 264 Linker Errors ...
Page 277: ...14 Chapter 14 Readinig List Files ...
Page 285: ...15 Chapter 15 Using Library Manager ...
Page 309: ...16 Chapter 16 Notes on Operating Environment ...
Page 321: ...17 Chapter 17 Appendix ...
Page 338: ... 4 Index ...