Simple arithmetic logic circuit --DRO！

Simple arithmetic logic circuit --DRO



Narrow DRO refers to some common timer, such as timer sports events like the test of time, which we can apply the most common to the DRO.

And relatively speaking specifically DRO is related to the deeper level of a logical operation circuit.

a brief introdction

In fact, the number of devices in digital systems mainly for counting the number of pulses to achieve measurement, counting and control functions, with both crossover functions, DRO is a basic counting unit and some of the control gate composed, counting unit by a series of flip-flops have all kinds of information storage function structure, these triggers have RS flip-flop, T flip-flop, D flip-flop and the JK flip-flop and the like.

DRO widely in digital systems applications, such as computer controller in the address of the instruction counts to sequentially fetch the next instruction, as multiplication operator, note the addition, subtraction, division number of times, and if the numbers instrument count pulses and so on. DRO can be used to display the working status of the product, in general, it is mainly used to indicate how many copies of the product has been completed folding collating work. Its main indicator is that the number of bits DRO common are 3 and 4 of. Obviously, the largest 3-digit DRO can display to maximum 999,4 digit can be displayed to 9999.

Category division

1, if classified according to whether the rollover while the trigger DRO, DRO can be divided into two kinds of synchronous and asynchronous DRO DRO.

2, according to the process of counting the numbers increase or decrease in classification, can be divided into the DRO DRO addition, subtraction and reversible DRO DRO, to clock signal increasing as DRO addition, subtraction DRO is declining, called the increase can be reduced reversible DRO.

There are also a variety of classification is not itemized, but the most common is the first category, because this classification can make a glance, know the DRO in the end is what triggers the way for the designer to design the circuit. In addition, often in accordance with the DRO DRO counts hex DRO into binary, decimal DRO like.

application

In digital electronic technology applied in the most sequential logic circuits. DRO can be used not only for counting clock pulses can also be used for frequency, timing pulses and pulse sequences to produce beats and digital operation and the like. But it does not display the results in general are to be displayed by an external LCD or LED screen in order.

DRO applications include calls, SMS, data and other types of records, and allows users to choose the clearing date, and add a reminder by category values, such as the user can select any one day, or the first day of each month, the last day as a recording cycle cleared day, while adding long call, short messages, the number of traffic reminder nodes. DRO is extremely extensive, not only can be used for counting, but also for frequency, timing and composition of various detection circuits and control circuits. For ease of use, in some monolithic integration on the DRO also additional asynchronous set to zero, preset number, hold functions, and set the corresponding control terminal.

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