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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