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<H1><font COLOR=#1809BB><A NAME="SECTION008130000000000000000">
Les champs de bits</A>
</font></H1>
<H2><font COLOR=#1809BB><A NAME="SECTION008131000000000000000">
G閚閞alit閟</A>
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<A NAME="4325">&#160;</A>
<A NAME="8728">&#160;</A>
Il est parfois n閏essaire pour un programmeur de d閏rire en termes de bits 
la structure d'une ressource mat閞ielle de la machine.
Un exemple typique est la programmation syst鑝e qui n閏essite de manipuler
des registres particuliers de la machine.
Par exemple, dans le manuel du <font size=-1><small>MC</small></font> 68030 de Motorola, le registre
d'閠at est ainsi d閏rit&nbsp;:
<DL COMPACT>
<DT><SMALL>-</SMALL>
<DD>bit 0 : carry&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bit 1 : overflow&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bit 2 : z閞o&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bit 3 : n間atif&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bit 4 : extension&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bits 5-7 : inutilis閟&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bits 8-10 : masque des interruptions&nbsp;;
<DT><SMALL>-</SMALL>
<DD>bit 11 : inutilis
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