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<title>6.9 Object length conversion</title>

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<h2>
  <a name="1205999"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">6.9 	 Object length conversion</font>
</h2><hr>


<p>
  <a name="1206000"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Earlier sections explained that data can be represented in various sized objects. This section describes the instructions that can be used to convert between these representations.</font>
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  <a name="1206001"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Most of the ST20-C2 integer arithmetic instructions operate on signed integers held in the integer stack registers as 32-bit objects, and produce results in this form. A few of the instructions operate on or produce results as 64-bit objects held in two of the 32-bit stack registers. The ST20-C2 therefore provides instructions that allow an integer to be sign extended to 32-bits or 64-bits, as well as instructions that allow a program to check that an integer can be represented in a smaller object than the object in which it is currently represented.</font>
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<p>
  <a name="1206002"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Object length conversion is also important for conversion of high level language data types.</font>
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<h3>
  <a name="1206004"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">6.9.1 	 Conversion between 8/16-bit object and word representations</font>
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<p>
  <a name="1214059"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">To enable integer representations to be converted between bytes, 16-bit objects, and words, the ST20-C2 provides the instructions shown in <a href="seq_op10.htm#1214112"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table

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