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<title>14.3 Two dimensional block move support</title>

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  <a name="1206809"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">14.3 	 Two dimensional block move support</font>
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  <a name="1204652"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Graphical applications often require the movement of two dimensional blocks of data, for example to perform windowing, overlaying. The ST20C2 contains instructions to perform efficient copying, overlaying and clipping of graphics data based on byte sized pixels.</font>
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<p>
  <a name="1204949"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">A two dimensional array can be implemented by storing rows adjacently in memory. Given any two 2-dimensional arrays implemented in this way, the instructions provided can copy a section (a block) of one array to a specified address in the other.
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  <caption><b><i><font face="Verdana, Arial, Helvetica, sans-serif"><a name="1204973"> </a><font face="Helvetica">Figure 10:  Two dimensional block move</font></font></i></b></caption>
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<p>
  <a name="1204701"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">To perform a two dimensional move, 6 parameters are required (see <a href="c24.htm#1204973"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Figure

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