58 lines
2.5 KiB
HTML
58 lines
2.5 KiB
HTML
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<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<meta name="generator" content="Adobe RoboHelp 9">
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<title>Counter/shifter</title>
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<link rel="StyleSheet" href="HtmlHelp.css" type="text/css">
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<script language="javascript" title="BSSC Special Effects" src="bsscdhtm.js" type="text/javascript"></script>
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<style title="hcp" type="text/css">
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<!--
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font.hcp1 { font-size:small;
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font-family:Arial; }
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font.hcp2 { font-size:small; }
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span.hcp3 { font-size:10pt; }
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-->
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</style>
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</head>
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<body>
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<h1 class="firstHeading" style="font-size: 18pt;"><font color="#008000"><b>Counter/shifter</b></font>
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</h1>
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<font size="3" face="Arial" class="hcp1"><img src="MAIN00000153.gif" alt="MAIN00000153.gif" title="MAIN00000153.gif" width="89" height="125" border="0"></font>
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<p>The outputs of the counter / shifter change in response to a rising
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edge on the INPUT pin.</p>
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<p>The outputs can be reset by taking the RESET (R) pin high. For binary
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'Type' RESET means all output pins to 0 (low) and for shift down 'Type'
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RESET means pin 1 to 1 (high) and all other output pins to 0. The outputs
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will remain in this state until the RESET pin goes high again and the
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INPUT pin goes high again to start the count / shift.</p>
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<p>Taking the DIRECTION (D) pin high will cause the outputs to count or
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shift down rather than up.</p>
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<p>The lights on the logic object design block indicate the current state
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of the inputs and output. These are operational in simulation and when
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online to the device.</p>
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<br><font color="#333399" size="3" class="hcp2"><b>Properties</b></font>
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<br><font size="3" face="Arial" class="hcp1"><img src="MAIN00000154.gif" alt="MAIN00000154.gif" title="MAIN00000154.gif" width="299" height="195" border="0"></font>
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<br> 
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<br><font size="3" class="hcp2"><b>Number of
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outputs</b></font>
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<br><font><span class="hcp3">Displays the number
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of outputs. This can be set from 1 to 32.</span></font>
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<br> 
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<br><font size="3" class="hcp2"><b>Type</b></font>
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<br><font><span class="hcp3">Selects whether
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the counter / shifter is to be set up as a binary counter or shift down.
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When set to be a binary counter, the outputs will increment in binary
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fashion each time the input goes high. When set as a shift down, the output
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which is high will move on to the next output each time the input goes
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high.</span></font>
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</body>
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</html>
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