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<h1>
<a name="998197"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Contents</font>
</h1><hr>
<h2>
<a name="1035934"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="cover.htm#1001643">ST20-C2 Instruction Set Reference Manual</a></font>
</h2>
<h2>
<a name="1035936"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="preface.htm#1000957">Preface</a></font>
</h2>
<dl>
<dd> <a name="1035938"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="preface.htm#1000960">Document identification and control</a></font>
<dd> <a name="1035940"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="preface.htm#1001512">ST20 documentation suite</a></font>
<dd> <a name="1035942"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="preface.htm#1000971">Notation, conventions and terminology</a></font>
</dl>
<h2>
<a name="1035944"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="intro.htm#1204473">1 Introduction</a></font>
</h2>
<h2>
<a name="1035946"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="part1.htm#1140676">Part 1 Instruction爏et燿efinition</a></font>
</h2>
<h2>
<a name="1035948"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="overview.htm#1204403">2 Overview</a></font>
</h2>
<dl>
<dd> <a name="1035950"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="overvie2.htm#1204405">2.1 ST20-C2 overview</a></font>
</dl>
<h2>
<a name="1035952"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="addressi.htm#1204403">3 Addressing and data representation</a></font>
</h2>
<dl>
<dd> <a name="1035954"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="address2.htm#1204410">3.1 Word address and byte selector</a></font>
<dd> <a name="1035956"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="address3.htm#1204419">3.2 Ordering of information</a></font>
<dd> <a name="1035958"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="address4.htm#1204532">3.3 Signed integers and sign extension</a></font>
</dl>
<h2>
<a name="1035960"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="register.htm#1204404">4 Registers</a></font>
</h2>
<dl>
<dd> <a name="1035962"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204412">4.1 Process state registers</a></font>
<dl>
<dd> <a name="1035964"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204462">4.1.1 Evaluation stack</a></font>
<dd> <a name="1035966"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204467">4.1.2 Instruction pointer</a></font>
<dd> <a name="1035968"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204469">4.1.3 STATUS register</a></font>
<dd> <a name="1035970"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204631">4.1.4 Workspace pointer, priority and process descriptors</a></font>
<dd> <a name="1035972"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204635">4.1.5 Additional process state registers</a></font>
<dd> <a name="1035974"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe2.htm#1204672">4.1.6 Shadow registers</a></font>
</dl>
<dd> <a name="1035976"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1204679">4.2 Other machine registers</a></font>
<dl>
<dd> <a name="1035978"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1204760">4.2.1 Scheduling queue pointers</a></font>
<dd> <a name="1035980"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1204765">4.2.2 CLOCKENABLES and CLOCKREG</a></font>
<dd> <a name="1035982"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1204767">4.2.3 Timer registers</a></font>
<dd> <a name="1035984"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1204773">4.2.4 ENABLES register</a></font>
<dd> <a name="1035986"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="registe3.htm#1205948">4.2.5 Error flags</a></font>
</dl>
</dl>
<h2>
<a name="1035988"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_rep.htm#1204403">5 Instruction representation</a></font>
</h2>
<dl>
<dd> <a name="1035990"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204416">5.1 Instruction encoding</a></font>
<dl>
<dd> <a name="1035992"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204418">5.1.1 An instruction component</a></font>
<dd> <a name="1035994"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204464">5.1.2 The instruction data value and prefixing</a></font>
<dd> <a name="1035996"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204497">5.1.3 Primary instructions</a></font>
<dd> <a name="1035998"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204572">5.1.4 Secondary instructions</a></font>
<dd> <a name="1036000"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re2.htm#1204591">5.1.5 Summary of encoding</a></font>
</dl>
<dd> <a name="1036002"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re3.htm#1204608">5.2 Generating prefix sequences</a></font>
<dl>
<dd> <a name="1036004"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re3.htm#1204611">5.2.1 Prefixing a constant</a></font>
<dd> <a name="1036006"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="inst_re3.htm#1204623">5.2.2 Evaluating minimal symbol offsets</a></font>
</dl>
</dl>
<h2>
<a name="1036008"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops.htm#1204402">6 Sequential operations</a></font>
</h2>
<dl>
<dd> <a name="1036010"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops2.htm#1204408">6.1 Registers</a></font>
<dd> <a name="1036012"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops3.htm#1204474">6.2 No operation</a></font>
<dd> <a name="1036014"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops4.htm#1204495">6.3 Local variables and constants, and stack operations</a></font>
<dd> <a name="1036016"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1204640">6.4 Integer stack evaluation</a></font>
<dl>
<dd> <a name="1036018"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1204681">6.4.1 Loading operands</a></font>
<dd> <a name="1036020"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1204993">6.4.2 Tables of constants</a></font>
<dd> <a name="1036022"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1205009">6.4.3 Single length signed integer arithmetic</a></font>
<dd> <a name="1036024"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1205078">6.4.4 Single length modulo integer arithmetic</a></font>
<dd> <a name="1036026"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1205108">6.4.5 Unary minus</a></font>
<dd> <a name="1036028"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1205123">6.4.6 Fractional arithmetic</a></font>
<dd> <a name="1036030"> </a><font face="Verdana, Arial, Helvetica, sans-serif"><a href="seq_ops5.htm#1205142">6.4.7 Saturated arithmetic</a></font>
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