SU1661747A1 - Data input device - Google Patents

Abstract

The invention relates to automation and computing and can be used to manually enter information into information processing devices. The purpose of the invention is to increase speed by organizing a search for the pressed key. The device for entering information contains a keyboard 1, a generator of 2 pulses, the first 3 and second 4 elements And, the first 5 and second 6 counters, the decoder 7, the element OR-NOT 8, the multiplexer 9, the elements EXCLUSIVE OR 10, the first 11 and second 12 elements OR, the first 13 and second 14 elements are NOT, the first 15 and second 16 comparison blocks, the first 17, second 18, third and fourth 20 triggers and the third element OR 21, the inverse output of the second trigger 18 being the gate output 22 of the device, and the outputs elements EXCLUSIVE OR 10 are connected to the address inputs of the multiplex 9 and litter are data outputs 23 of the device. In the device, the counter "hopping" scan of the keyboard is realized with the subsequent step-by-step return to the desired key. 1 il.

Description

The invention relates to automation and computing and can be used to manually enter information into processing devices.

The aim of the invention is to improve the speed of the device.

The drawing shows the structure of the device for inputting information.

The device for entering information contains a keyboard 1, a pulse generator 2, the first 3 and second 4 elements AND, the first 5 and second 6 counters, the decoder 7, the element OR NOT 8, the multiplexer 9, the elements EXCLUSIVE OR 10, the first 11 and the second 12 Elements OR, first 13 and second 14 elements NOT, first 15 and second 16 blocks of comparison, first 17, second 18, third 19 and fourth 20 triggers and third element OR 21, as well as device outputs 22 and 23.

The group of outputs of the keyboard 1 is connected in series with the inputs of the second group of the first comparison unit 15 and in reverse sequence with the input. Dami second group of the second block 16 comparison.

The device works as follows.

In the initial state, when none of the keyboard 1 keys are pressed, all selectable inputs of multiplexer 9, as well as the element OR NONE 8, have logical O, and their outputs have logical 1, which through the second 14 and first 13 respectively. the elements are NOT already logical O keep at the inverse output of the second 18 and first 17 flip-flops logical O, respectively, while logical 1 from the direct output of the second flip-flop 18 goes to the second inputs of the first 3 and second 4 And elements, and logical O

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from the inverse output of the first trigger 17, it enters the control input of the first 15 and second 16 comparison blocks and simultaneously holds the third 19 and fourth 20 triggers and the first 5 and second 6 counters in the zero state. Simultaneously, the logical O of the direct outputs of the third 19 and fourth 20 flip-flops through the third element OR 21 arrive at the third input of the first element I 3, and the logical 1 of their direct outputs go to the third and fourth inputs of the second element 4, respectively. Therefore, the clock pulses from the output of the generator 2 is received only through the second element And 4 to the summing input of the second counter 6.

When you press any key of the keyboard 1, the logical input 1 is applied to the corresponding input of the OR-NOT 8 element, without changing the state of the first trigger 17. When the moving contact reaches the normally open contact of the pressed key, the second input of the first OR 11 element appears. , while the first trigger 17 is set to the zero state during the reset and the logical 1 from its inverse output allows the comparison blocks 15 and 16 to operate in the code comparison mode, stops holding the third 19 and fourth 20 triggers and the first 5 and second 6 counters in the zero state.

Clock pulses from the output of the generator 2 through the second element I 4 arrive at the summing counting input of the second counter 6, the output of which appears a sequence of increasing codes, which are decoded in the decoder 7 into the unitary code, are sent to the first groups of inputs of the first 15 and second 16

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comparison blocks, on the second groups of inputs of which there is a unitary code of the key number pressed.

At the time when a code appears at the output of the second counter 6, the unitary analogue of which from the output of the decoder 7 exceeds the positional position of the pressed key on the second inputs of the first 15 group or the second 16 comparison blocks (coarse search), the pulse front is formed at the corresponding output which sets respectively the first 19 or second 20 triggers to a single state, in which the logical O inverse output stops the passage of clock pulses through the second element 4, the logical 1 resolves them by tuplenie through the first AND gate 3 to the subtracting input of the first counter 5. Subtract the total content of two counters 5 and 6 (exact search) takes place as long as their combined outputs not sformiruets code corresponding to the pressed key. Thereafter, a logical O appears at the output of the multiplexer 9, which through the second element OR 12 sets the second trigger 18 to the zero state, in which the logical O from its direct output prevents the passage of clock pulses from the generator 2 to the counting inputs of the first 5 and second 6 counters, and a logical 1 with an inverse output, arriving at the bus 22 of the device strobe, allows reading information from the outputs 23 of the device.

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However, if the first in the process

the coarse search is triggered by a counter search chain, i.e. the second comparison unit 16 and the fourth trigger 20, then the information outputs 23 of the device and the address inputs of the multiplexer 9 receive a code combination from the outputs of the first 5 and second 6 counters, pre-inverted by elements EXCLUSIVE OR 10. If the output of the second counter 6 (together with zero values of the outputs of the first counter 5) a code is formed equal to the number of the pressed key, then the operation of the device is performed by a simplified algorithm, i.e. without | sub-unit subtraction from the override code (exact search).

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When returning the moving contact to the normal closed contact. keypads 1, which appear logical 1 at the outputs of the element OR-HE 8 and multiplexer 9, and hence the logical O at the outputs of the first 13 and second 14, respectively, NOT, set the device to its initial state.

Thus, organizing a counter-hopping scan of the keyboard with a subsequent step-by-step return to the desired key allows you to catch the speed of the device for entering information.

Claims (1)

Invention Formula A device for entering information containing a keyboard, a multiplexer, a pulse generator, the first and second elements are AND, the first and second counters, the decoder, the OR-NOT element, the first and second elements OR, the first and second elements are NOT, the first comparison unit, the first, second and the third trigger, the output of the pulse generator connected to the first inputs of the first and second elements And, the second inputs of which are connected to the direct output of the second trigger, the inverse output of which is the gate output of the device, the output of the first element And connected to the counting input of the first counter, the output of the second element And is connected to the first counting input of the second counter, the second counting input of which is connected to the output the first counter, the outputs of the group of the first and second counters are connected to the inputs of the decoder, the output of the first trigger is connected to the reset inputs of the counters, information input the third trigger and the control input of the first comparison unit, the output of which is connected to the gate input of the third trigger, the inverse output of which is connected to the third the input of the second element And, the decoder outputs are connected to the inputs of the first group of the first comparison unit, the second group of inputs of which, the inputs of the OR-NOT element and the information inputs of the multiplexer are connected to the outputs of the keyboard groups, the output of the keyboard is connected to the first inputs of the first and second elements OR, the outputs of which connected to the inputs of the devices ki in O, respectively, of the first and second triggers, the output of the OR element is NOT connected to the second input of the first OR element and through the first EC element to the installation input of 1 of the first trigger, the multiplexer output is connected to the second input of the second OR element and through the second elemen with the input of the installation in the 1 second rotor trigger, it differs agosche with the fact that, in order to increase the speed of the device, the EXCLUSIVE OR elements, the second comparison unit, the fourth trigger and the third OR element, are introduced (the groups of counters are connected to first in by the moves of the EXCLUSIVE OR elements, the second inputs of which are connected to the third output of the fourth flip-flop and the first input of the third element OR, the output of which is connected to five 0 the third input of the first element AND, the outputs of the EXCLUSIVE OR elements are connected to the address inputs of the multiplexer and are information inputs of the device, the keyboard group outputs are connected to the corresponding inputs of the first group of the second comparison unit, the output of which is connected to the gate input of the fourth trigger, whose information input and control the input of the second comparison unit is connected to the outputs of the first trigger, the inverse output of which is connected to the fourth input of the fourth element I, the direct output tert In its trigger, it is connected to the second input of the third OR element, the outputs of the decoder are connected to the inputs of the second group of the second comparison unit.