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# COUNTER CLASSIFICATION

الكلية كلية الهندسة     القسم  الهندسة الكهربائية     المرحلة 4
أستاذ المادة ايهاب عبد الرزاق حسين محمد       16/12/2016 18:42:47
COUNTER CLASSIFICATION
Digital logic counters can be classified according to their operational characteristics. The key characteristics that must be determined through analyzing the counter circuit are the count modulus, counter stages, output bits, frequency division, asynchronous operation, synchronous operation, and trigger characteristics, as described in sections below.
1. Count Modulus The count modulus is the total number of states or values generated by the counter as it progresses through its specified sequence. The modulus, or MOD, is one of the most important characteristics to specify when classifying a counter since it identifies the number of values in the count sequence and determines the frequency division capabilities of the counter. Decade counters always have a modulus of 10 and are sometimes referred to as MOD-10 counters. Binary counters of n bits have a modulus of 2n. Figures (1 and 2) show that the modulus of a counter can be determined by a waveform generated by the counter. A count modulus can also be designated by astate transition diagram. The states of a counter are the output numbers generated by the counter. A state transition diagram shows the progression of the number generated from one clock pulse to the next. The total number of states in the diagram is the modulus of the counter. Figure (3) shows the state transition diagrams for the decade counter and binary counter whose waveforms were shown in Figures (1 & 2).

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