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Subject: Design of Counters
Date: Sat, 1 Jan 2011 15:04:31 +0200
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<HTML><HEAD><TITLE>Design of Counters</TITLE>
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<P><BIG><BIG><BIG><STRONG>Design of =
Counters</STRONG></BIG></BIG></BIG></P>
<P><FONT face=3DArial>A sequential circuit that goes through a =
prescribed sequence=20
of states upon the application of input pulses is called a=20
<STRONG>counter</STRONG>. The input pulses, called <STRONG>count=20
pulses</STRONG>, may be clock pulses. In a counter, the sequence of =
states may=20
follow a binary count or any other sequence of states. Counters are =
found in=20
almost all equipment containing digital logic. They are used for =
counting the=20
number of occurrences of an even and are useful for generating timing =
sequences=20
to control operations in a digital system.</FONT></P>
<P><FONT face=3DArial>Of the various sequences a counter may follow, the =
straight=20
binary sequence is the simplest and most straight forward. A counter =
that=20
follows the binary sequence is called a binary counter. An n-bit binary =
counter=20
consists of n flip-flops and can count in binary from 0 to 2<SUP>n</SUP> =
-=20
1.</FONT></P>
<P><FONT face=3DArial>Let's look at some examples of counter =
designs.</FONT></P>
<P><BIG><A=20
href=3D"http://www.eelab.usyd.edu.au/digital_tutorial/part3/example1-5.ht=
m"><STRONG>Example=20
1.5</STRONG></A></BIG></P>
<P><BIG><A=20
href=3D"http://www.eelab.usyd.edu.au/digital_tutorial/part3/example1-6.ht=
m"><STRONG>Example=20
1.6</STRONG></A></BIG></P>
<P>&nbsp;</P>
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