Development Tools

.db8/.ddw

Initialization of 8-byte area.

[Syntax]

Symbol field	Mnemonic field	Operand field	Comment field
[label:]	.db8	absolute-expression[, ... ]	[; comment]
[label:]	.ddw	absolute-expression[, ... ]	[; comment]

[Function]

-	The .db8 and .ddw directive tells the assembler to initialize a memory area in 8-byte units with the initial value(s) specified in the operand field.

[Use]

-	Use the .db8 and .ddw directive when defining a 8-byte numeric constant such as an address or data used in the program.

[Description]

-	The assembler initializes 8-byte area with:

(a)	Expression

The value of an expression must be 8-byte data. Therefore, the value of the operand must be in the range of 0x0 to 0xFFFFFFFFFFFFFFFF. If the value exceeds 8-byte, the assembler will use only lower 8-byte of the value as valid data.

No character string constants can be described as an initial value.

-	If the relocation attribute of the section is "BSS", then an error is output because the .db8 and .ddw directive cannot be described.

-	Two or more initial values may be specified within a statement line of the .db8 and .ddw directive.