Holtek HT-IDE, User Manual

Page: 128 / 258

•
Example
IF debugcase
ACC1 equ 5
extern username: byte
ENDIF
In this example, the value of the variable ACC1 is set to 5 and the
username is declared as an external variable if the symbol debugcase is
evaluated as true i.e. nonzero.
→
Syntax
IFDEF
name
IFNDEF
name
•
Description
The directives IFDEF and IFNDEF test whether or not the given name has
been defined. The IFDEF directive grants assembly only if the name is a
label, a variable or a symbol. The IFNDEF directive grants assembly only
if the name has not yet been defined. The conditional assembly directives
support a nesting structure, with a maximum nesting level of 7.
•
Example
IFDEF buf_flag
buffer DB 20 dup(?)
ENDIF
In this example, the buffer is allocated only if the buf_flag has been
previously defined by the directive EQU or the option /D of the command
line.
File control directives
→
Syntax
INCLUDE
file-name
•
Description
This directive inserts source codes from the source file given by file-name
into the current source file during assembly. HASM supports at most 7
nesting levels.
•
Example
INCLUDE macro.def
In this example, HASM inserts the source codes from the file macro.def
into the current source file.
HT-IDE User’s Guide
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