Panasonic MN1030 Writing Directive Statements, List of directives, Document conventions

Chapter 9 Writing Machine Language Instructions and Directive Statements

9.4Writing Directive Statements

Directives differ from machine language instructions in that they only have effect on the assembler. Directives specify program structure and start addresses, set constants and radices, and specify options and label attributes.

List of directives

Below is a list of directives.

Directive	Function
section	Specifies a section
align	Aligns the location counter value to a multiple of an expression.
end	Indicates the end of the program.
listoff	Stops list output from the line following this directive.
liston	Starts list output from this directive.
notation	Selects the coding format for numbers.
org	Changes the program address.
opt	Enables/disables optimization functions.
page	Specifies the number of columns and rows on one page of the list file.
radix	Selects the radix to be specified by default.
dc	Stores an 8-bit constant in a memory area.
ds	Reserves an 8-bit data area in a memory area.
dw	Stores a 16-bit constant in a memory area.
dd	Stores a 32-bit constant in a memory area.
equ	Defines a name as the value of an operand expression.
global	Declares external references with external declarations.
tit	Specifies the header name of the list file.
xlistoff	Stops list output including this directive.
xliston	Starts list output from the line following this directive.
funcinfo	Specifies additional information for a function.
assign	Defines a name as the value of an operand expression.

Document conventions

Symbols used in this chapter have the following meanings.

[ ] ( )...

Contents of brackets [ ] may be omitted. Contents of parentheses ( ) may be repeated.

Specify one or the other of the terms delimited by a vertical bar .

Writing Directive Statements 153