Mercurial > hg > index.cgi
diff docs/manual/x212.html @ 324:b30091890d62
Add documentation of the new hex output formats.
Thanks to text contributed by Tom LeMense, the manual now includes
documentation of the hex formats he contributed. This also includes some
updated text on the ORG directive. Only minor editorial changes vary the
text from Tom's original.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Tue, 04 Mar 2014 23:10:13 -0700 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/docs/manual/x212.html Tue Mar 04 23:10:13 2014 -0700 @@ -0,0 +1,180 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> +<HTML +><HEAD +><TITLE +>Numbers and Expressions</TITLE +><META +NAME="GENERATOR" +CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK +REL="HOME" +TITLE="LW Tool Chain" +HREF="index.html"><LINK +REL="UP" +TITLE="LWASM" +HREF="c62.html"><LINK +REL="PREVIOUS" +TITLE="Symbols" +HREF="x207.html"><LINK +REL="NEXT" +TITLE="Assembler Directives" +HREF="x220.html"></HEAD +><BODY +CLASS="SECTION" +BGCOLOR="#FFFFFF" +TEXT="#000000" +LINK="#0000FF" +VLINK="#840084" +ALINK="#0000FF" +><DIV +CLASS="NAVHEADER" +><TABLE +SUMMARY="Header navigation table" +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TH +COLSPAN="3" +ALIGN="center" +>LW Tool Chain</TH +></TR +><TR +><TD +WIDTH="10%" +ALIGN="left" +VALIGN="bottom" +><A +HREF="x207.html" +ACCESSKEY="P" +>Prev</A +></TD +><TD +WIDTH="80%" +ALIGN="center" +VALIGN="bottom" +>Chapter 3. LWASM</TD +><TD +WIDTH="10%" +ALIGN="right" +VALIGN="bottom" +><A +HREF="x220.html" +ACCESSKEY="N" +>Next</A +></TD +></TR +></TABLE +><HR +ALIGN="LEFT" +WIDTH="100%"></DIV +><DIV +CLASS="SECTION" +><H1 +CLASS="SECTION" +><A +NAME="AEN212" +>3.5. Numbers and Expressions</A +></H1 +><P +> Numbers can be expressed in binary, octal, decimal, or hexadecimal. Binary +numbers may be prefixed with a "%" symbol or suffixed with a "b" or "B". +Octal numbers may be prefixed with "@" or suffixed with "Q", "q", "O", or +"o". Hexadecimal numbers may be prefixed with "$", "0x" or "0X", or suffixed +with "H". No prefix or suffix is required for decimal numbers but they can +be prefixed with "&" if desired. Any constant which begins with a letter +must be expressed with the correct prefix base identifier or be prefixed +with a 0. Thus hexadecimal FF would have to be written either 0FFH or $FF. +Numbers are not case sensitive. </P +><P +> A symbol may appear at any point where a number is acceptable. The +special symbol "*" can be used to represent the starting address of the +current source line within expressions. </P +><P +>The ASCII value of a character can be included by prefixing it with a +single quote ('). The ASCII values of two characters can be included by +prefixing the characters with a quote (").</P +><P +> LWASM supports the following basic binary operators: +, -, *, /, and %. +These represent addition, subtraction, multiplication, division, and +modulus. It also supports unary negation and unary 1's complement (- and ^ +respectively). It is also possible to use ~ for the unary 1's complement +operator. For completeness, a unary positive (+) is supported though it is +a no-op. LWASM also supports using |, &, and ^ for bitwise or, bitwise and, +and bitwise exclusive or respectively. </P +><P +> Operator precedence follows the usual rules. Multiplication, division, and +modulus take precedence over addition and subtraction. Unary operators take +precedence over binary operators. Bitwise operators are lower precdence +than addition and subtraction. To force a specific order of evaluation, +parentheses can be used in the usual manner. </P +><P +> As of LWASM 2.5, the operators && and || are recognized for boolean and and +boolean or respectively. They will return either 0 or 1 (false or true). +They have the lowest precedence of all the binary operators. </P +></DIV +><DIV +CLASS="NAVFOOTER" +><HR +ALIGN="LEFT" +WIDTH="100%"><TABLE +SUMMARY="Footer navigation table" +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +><A +HREF="x207.html" +ACCESSKEY="P" +>Prev</A +></TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="index.html" +ACCESSKEY="H" +>Home</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +><A +HREF="x220.html" +ACCESSKEY="N" +>Next</A +></TD +></TR +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +>Symbols</TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="c62.html" +ACCESSKEY="U" +>Up</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +>Assembler Directives</TD +></TR +></TABLE +></DIV +></BODY +></HTML +> \ No newline at end of file