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