Zilog Z8F0130 - Manual (Page 358)

Using the Macro Assembler UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
•
The space provided in the EXTERN or XREF directive.
•
If no space is provided with the EXTERN or XREF directive, the space of the segment in
which the EXTERN directive was encountered is used as the location of the label.
Label Checks
The assembler performs location checks when a label is used as an operand, including for-
ward referenced labels. Thus, when a label that is not located in the proper space is used as
an operand, the assembler flags a warning.
Example
EXTERN label1:ROM

JP label1 ; valid

ld r0, label1 ; invalid
Source Language Syntax
The syntax description that follows is given 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> => <expression>|

<expression><relop><expression>
<relop> => == | < | > | <= | => | !=