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UM0144 bảng dữ liệu(PDF) 59 Page - STMicroelectronics

tên linh kiện UM0144
Giải thích chi tiết về linh kiện  ST7 Assembler Linker
PDF  92 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0144 bảng dữ liệu(HTML) 59 Page - STMicroelectronics

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UM0144
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A.23
#IF
A.24
#IF1 Conditional
Purpose:
Start conditional assembly.
Format:
#IF <exp>
Description:
Sometimes it is necessary to have different versions of a program or macro. This
can be achieved by completely SEPARATE programs / macros, but this solution has
the associated problem that changes to any part of the program common to all the
versions requires all of them being changed, which can be tedious.
Conditional assembly offers the solution of controlled 'switching off' assembly of the
source code, depending on the value of the numeric expressions.
The structure is known as 'IF/ELSE/ENDIF': see the example for the format.
The #ELSE statement is optional. If the expression resolves to 0 the expression is
assumed to have a 'false' result: the source code between the false #IF and the next
#ENDIF (or #ELSE if supplied) will not be assembled.
If the #ELSE is supplied, the code following the #ELSE will be assembled only if the
condition is false.
Conditionals may be nested up to 15 levels: when nesting them, keep in mind
that each #IF must have a #ENDIF at its level, and that #ENDIFs and #ELSEs refer
to the last unterminated #IF.
Example:
See Also:
#ENDIF, #ELSE, #IF1, #IF2
Purpose:
Conditional on being in pass #1.
Format:
#IF1
Description:
This directive works just like #IF except it has no argument and only evaluates itself
as true if the assembler is on its first pass through the source code. Can use #ELSE
and requires #ENDIF.
Example:
See Also:
#IF2, #ELSE, #IF, #ENDIF
#IF {1 eq 1}
%out true
#FALSE
%out false
#ENDIF
#IF1
%OUT “Starting Assembly”
#ENDIF



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