Echelon Neuron - Manual (Page 17)

recommended. If no file name extension is provided on the command line, the
Neuron Assembler assumes an .ns extension.
A file that is used with the Neuron Librarian (NLIB) must follow the Windows
8.3 naming convention (for example, filename.ext, where filename is no more than
eight characters and ext is one of the allowable extensions for Neuron assembly
files, such as .ns and .no). Spaces are not allowed in the file name or the
extension.
File Format
Each line in an assembly source file is independent, with no line-continuation
character or terminator character. An assembly source line can contain one of
the following:
• A blank line (zero, one, or more whitespace characters (blanks, spaces, or
tabs), followed by a newline or carriage-return character). The Neuron
Assembler ignores blank lines.
• A comment. A comment starts with a semicolon character (;) and ends
with a newline or carriage-return character. The Neuron Assembler
ignores all characters after the semicolon.
• A label. A label is an identifier for an instruction, directive, or segment.
• An assembly instruction, with zero, one, or more arguments. The line
with the instruction can begin with an optional label, and can also end
with an optional comment.
• An assembler directive. The line with the directive can begin with an
optional label (if the directive allows one), and can also end with an
optional comment.
If the line contains a label, it must begin in the first column. If the line contains
an instruction or directive without a label, the instruction or directive must begin
beyond the first column. A comment can begin in any column, but always
extends to the end of the line.
Spaces or tabs separate the label, the instruction mnemonic or directive, and the
first argument (if any). Multiple arguments are separated by spaces, tabs, or
commas, depending on the syntax of the particular instruction or directive.
Thus, the basic format for an assembly source line is:
label instruction operand ; comment
label DIRECTIVE argument ; comment
By convention, instruction mnemonics are specified in lower case and directives
are specified in upper case.
Output Files
The Neuron Assembler produces the following output files:
• An object output file
• An optional listing output file
Neuron Assembly Language Reference 7