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<h2>
  <a name="1204954"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">11.5 	 Error handling</font>
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<p>
  <a name="1204955"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Certain run time errors such as arithmetic overflow and subscript errors are checked by ST20-C2 instructions. On the ST20-C2 these can be made to signal traps and be fielded by trap handlers. However, if the trapping behavior is disabled then these error cases revert to the previous definition of signalling the presence of an error by setting the sticky <span class=Signal>ErrorFlag</span>.</font>
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<p>
  <a name="1204956"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">While there is an <span class=Signal>ErrorFlag</span> at each priority, for compatibility with previous processors, the ST20-C2 copies the low priority <span class=Signal>ErrorFlag</span> into the high priority version when a pre-emption switches priority from low to high priority.</font>
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<h3>
  <a name="1204957"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">11.5.1 	 The error flag</font>
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  <a name="1204986"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><span class=Signal>ErrorFlag</span> can be explicitly set, cleared and tested by instructions shown in <a href="boot6.htm#1204983"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table

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