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Chapter 9 Writing Machine Language Instructions and Directive Statements
Writing Directive Statements 169
9.4.12 dw
Syntax
label
operation
operand
[name]
dw
expression (, expression )...
Functional description
This directive is used to define 16-bit constants in a memory area. The 16-bit constant specified by the
operand will be stored at the location of the statement specifying this directive.
When a name is coded for the label, the assembler will assign the current location counter value to that
name.
Operand coding rules
The operands are delimited with commas (,). Any number of operands can be coded.
If data that exceeds 16 bits is specified, the lower 16 bits will be valid, and the upper bits will be lost.
The assembler will output a warning message in such cases.
When the specified data has fewer than 16 bits, those bits will fill the lower bits, and the upper bits will
be padded with zeroes.
Usage example
Below is an example use of the dw directive.
dw.lst
Page 1
*** PanaX Series MN1030 Cross Assembler ***
Loc
Object
Line
Source
1
_DATA
section
DATA, PUBLIC, 4
00000000
3930
2
dw0 dw
12345
00000002
34127856
3
dw1 dw
0x1234, 0x5678
00000006
0000
4
dw2 dw
0
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 ...