Chapter 9 Writing Machine Language Instructions and Directive Statements
166 Writing Directive Statements
9.4.10 dc
Syntax
label
operation
operand
[name]
dc
constant | expression (, constant | expression )...
Functional description
This directive is used to define constants in a memory area. The 8-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 expression coded in the operand must result in the attribute abs(absolute).
Refer to section 8.7.4 “Expression Attributes”, regafding attributes of expressions.
Specify one of the following constants or the operand.
•
character constant
•
string constant
The operands are delimited with commas (,). Any number of operands can be coded.
If data that exceeds 8 bits is specified, the lower 8 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 8 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 dc directive.
DC.LST
Page 1
*** PanaX Series MN1030 Cross Assembler ***
Loc
Object
Line
Source
1
_DATA
section
DATA,PUBLIC,4
00000000
41
2
cd0 dc
’A’
00000001
414243
3
cd1 dc
“ABC”
00000004
3F
4
cd2 dc
255 >> 2
00000005
0E
5
cd3 dc
(12+3)/2*2
00000006
FF
6
cd4 dc
0b11111111
00000007
FFFE
7
cd5 dc
0377, 0376
00000009
FF
8
cd6 dc
255
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 ...