What is a digital counter?
Full Charge Bookkeeperor electronic counters are synchronous and/or asynchronous sequential type circuits, which have a clock type input (a square pulse) that activates a series of logic circuits to establish as output a number in code format that another component such as a microprocessor, a 7-SEC display or an LCD display can understand.
Its purpose is to increase and/or decrease the amount of said number for each clock pulse it perceives. The output codes can generally be binary, although they can also exist with hexadecimal or octal outputs, among others.
Full Charge Bookkeeper Full Charge Bookkeeper can be assembled from scratch with their components separated and applying digital logic techniques (truth tables and Karnaugh maps). Counters usually come as integrated circuits internally composed of several components (resistors, logic gates, flip-flops, etc.). The characteristics and control methods of each counter will depend on the internal logical structure of each one.
Some of the control features present in a meter are:
Reset Pin, is responsible for resetting the counter at the desired time.
Enabling Pin is responsible for activating or deactivating the count.
Direction Pin is responsible for selecting whether the number increases or decreases.
What types of digital meters are there?
Meters can be classified by different characteristics, but one of the most important is their type of operation. The counters can be of the synchronous type and of the asynchronous type.
a) Asynchronous type counters:
They consist of circuits formed by bridged JK-type flip-flops (Bridging between the J and K inputs) organized in cascade, that is, the Q output of one flip-flop goes to the JK input of the next flip-flop. Each flip-flop represents a bit of space for the code.
Being the number of flip-flops equal to N and using the base powers of two, the magnitude of the binary counter will be equal to the base power of 2 raised to the number N of flip-flops that make up the counter. The disadvantage of this type of counter is that it can only perform ascending and/or descending type serial sequences.
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b) Synchronous type counters:
They are mainly made up of flip-flops that have a clock signal, which is activated simultaneously by executing each flip-flop at the time of the square or clock pulse. It can also be said that the flip-flop operations are executed in parallel, unlike asynchronous counters that are serial. This type of counter is much more flexible than asynchronous counters. Decade counters have a BCD (Binary Code Decimal) type output, for which they have a “directly” decimal output when used with this type of display (for example, 7-SEG display). Johnson counters, which are made up of D-type flip-flops (they can also be implemented with JK-type flip-flops). Their main advantage is that due to their connection scheme, they only need to use half the number of flip-flops that a normal synchronous counter would use.
Applications of a counter circuit
As such a Tax Lien counter circuit is not used alone. An output is needed that translates the information that the meter carries to a human level. Visual media with the 7-SEC displays or LCD displays are generally used. Sometimes these means do not work in the same language as the counter, so a driver may be needed to serve as a translator to make the connection between the two:
Some of the applications of digital meters are
As a timer, they are used as part of time circuits where it is necessary to keep the time sequence of execution of different processes. As an accountant, in systems where you need to keep track of specific amounts, for example, in a shopping center where you need to keep track of people who enter daily.