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<title>3.5 Master control loop</title>

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<h2>
  <a name="1112422"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">3.5 	 Master control loop</font>
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<p>
  <a name="1112423"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The ST20-C1's behavior is determined by a master control loop. Each iteration of this loop is termed one interrupt point, and is the finest grain of control visible to a programmer.</font>
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  <a name="1112424"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The loop is organized as a prioritized sequence of rule/action pairs. Starting at the top for each rule in turn, if the condition is true, the corresponding action is performed and the loop is started again from the top. If the condition is false no action is performed and control passes to the next rule.</font>
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  <a name="1112425"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">In the C programming language, this corresponds to code of the form:</font>
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<a name="1112426"> </a><font size=2 face=Courier><strong>while(1) {<br>

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