I know this is a basic question. But I want to know the use of Reset, Preset and Clear in a Counter circuit. How do I use them? An example would be appreciated.
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3\$\begingroup\$ What kind of counter circuit? Do you have a specific chip in mind or something? \$\endgroup\$– MajenkoCommented Oct 11, 2014 at 19:15
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\$\begingroup\$ I'm very new to electronics, i'm using counters in general using j-K flip-flops \$\endgroup\$– Harish RCommented Oct 11, 2014 at 19:36
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1 Answer
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In the kind of counter circuit you're talking about, "PRESET" or "SET" generally refers to forcing an output stage to a logical "1", and "CLEAR" or "RESET" generally refers to forcing an output stage to a logical "0".
answered Oct 11, 2014 at 20:12
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\$\begingroup\$ Can you please give me an example based on mod-n up and mod-n down counters. \$\endgroup\$– Harish RCommented Oct 11, 2014 at 20:17
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1\$\begingroup\$ Sure; edit your post with a schematic and I'll annotate it for you. \$\endgroup\$ Commented Oct 11, 2014 at 20:26
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\$\begingroup\$ For example, I want to construct a mod-3 up counter. From 000 -> 001 -> 011 again to 000. What should I do with the preset and reset ? \$\endgroup\$– Harish RCommented Oct 11, 2014 at 21:16
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1\$\begingroup\$ Since SETs and RESETs can be either positive or negative true, it would be helpful if you'd resolve the ambiguity by just posting a detailed schematic of your circuit. \$\endgroup\$ Commented Oct 11, 2014 at 21:37
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\$\begingroup\$ For an N-bit counters,
PRESETwill typically cause the state of the counter to be set according to the state of N inputs (for some counters the behavior is asynchronous; for others, the supplied state will be used instead of the next count). \$\endgroup\$– supercatCommented Nov 11, 2014 at 0:06