Lecture 12 - Webstaff.kmutt.ac.th - kmutt
Lecture 12 - Webstaff.kmutt.ac.th - kmutt
Lecture 12 - Webstaff.kmutt.ac.th - kmutt
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Summary<br />
Resetting <strong>th</strong>e Count wi<strong>th</strong> a Decoder<br />
The divide-by-60 counter in <strong>th</strong>e text also uses partial<br />
decoding to clear <strong>th</strong>e tens count when a 6 was detected.<br />
HIGH<br />
CLR<br />
CTR DIV 10<br />
CTEN TC = 9<br />
RCO<br />
CLR CLR CTR DIV 6<br />
CTEN<br />
CLK<br />
C<br />
Q 3<br />
Q 2 Q 1 Q 0<br />
C<br />
Decode 59<br />
Q 3 Q 2 Q 1 Q 0<br />
Decode 6<br />
TC = 59<br />
To ENABLE<br />
of next CTR<br />
To next<br />
counter<br />
units<br />
The divide char<strong>ac</strong>teristic illustrated here is a good way to obtain a<br />
lower frequency using a counter. For example, <strong>th</strong>e 60 Hz power line<br />
can be converted to 1 Hz.<br />
tens<br />
Floyd, Digital Fundamentals, 10 <strong>th</strong> ed<br />
© 2009 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved
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