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<a name="1102660"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">7.10 Sleep</font>
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<a name="1102661"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When the ST20-C1 becomes idle it disables clock distribution to its circuits and consumes a very small amount of electrical power; this is known as sleep mode. The counters are re-enabled and normal operation resumes automatically and instantly when either an interrupt or a software reset from the diagnostic controller is received.</font>
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<a name="1102662"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Sleep mode may also be triggered directly from software by setting the <span class=Signal>sleep</span> bit in the <span class=Signal>status</span> register:</font>
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<dt> <a name="1102663"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><strong>ldc sleep; bitmask; statusset;</strong> </font>
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<a name="1102668"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">In this case also, sleep mode persists until the next interrupt or software reset.</font>
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<a name="1107431"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The <span class=Signal>sleep</span> bit in the <span class=Signal>status</span> register being asserted causes the ST20-C1 to clear the bit, and enter sleep mode. </font>
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<a name="1107451"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em>Note: The <span class=Signal>sleep</span> bit is a command to enter sleep mode, and so while in sleep mode the bit is clear (the command has already been implemented).</em></font>
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<font size=1 face="Verdana, Arial, Helvetica, sans-serif"> © 1997, 2002 STMicroelectronics. All Rights Reserved.<br>
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