Zilog ZUSBOPTS Uživatelský manuál stáhnout pdf (Strana 280)

100

101

Source Language Syntax UM017105-0511

252

Zilog Developer Studio II – ZNEO™

User Manual

•

The space of the segment in which the label is defined.

•

The space provided in the EXTERN or XREF directive.

•

If no space is provided with the EXTERN or XREF directive, the space check is not per-

formed on the label.

Source Language Syntax

The syntax description that follows is offered here to outline the general assembler syntax.

It does not define assembly language instructions.

<source_line> →

→

<if_statement>

[<Label_field>]<instruction_field><EOL>

[<Label_field>]<directive_field><EOL>

<Label_field><EOL>

<EOL>

<if_statement> →

→

<if_section>

[<else_statement>]

ENDIF

<if_section> → <if_conditional>

<code-body>

<if_conditional> → IF<cond_expression>|

IFDEF<ident>|

IFSAME<string_const>,<string_const>|

IFMA<int_const>

<else_statement> → ELSE <code_body>|

ELIF<cond_expression>

<code_body>

[<else_statement>]

<cond_expression> → <exp

ression>|

<relop> → == | < | > | <= | => | !=

<code_body> → <source_line>@

<label_field> → <ident>:

<instruction_field> → <mnemonic>[<operand>]@

<directive_field> → <directive>

<mnemonic> → valid instruction mnemonic

<operand> →

→

<addressing_mode>

<addressing_mode> → valid instruction addressing mode

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