Development Tools

A.3.2 Defining variable with initial values

To allocate a variable area with a default value, use the .DB directives/.DB2 directives/.DB4 directives in the section with the default value.

See "8.4 Creating ROM Images" for variable with initial values.

-	1-byte values

[label:]        .DB value

-	2-byte values

[label:]        .DB2 value

-	4-byte values

[label:]        .DB4 value

In order that it may be referenced from other files as well, it is necessary to declare the label with the .PUBLIC directive.

.PUBLIC Symbol name

Example

Defining variable with initial values

        .DSEG   sdata

        .PUBLIC _val0       ;Sets _val0 as able to be referenced from other files

        .PUBLIC _val1       ;Sets _val1 as able to be referenced from other files

        .PUBLIC _val2       ;Sets _val2 as able to be referenced from other files

        .ALIGN  2           ;Aligns _val0 to 2 bytes

_val0:

        .DB4    100         ;Allocates a 4-byte area for _val0, and stores 100 in it

_val1:

        .DB2    10          ;Allocates a 2-byte area for _val1, and stores 10 in it

_val2:

        .DB     1           ;Allocates a 1-byte area for _val2, and stores 1 in it