SU1160387A1 - Information input device - Google Patents

Abstract

A DEVICE FOR INPUT OF INFORMATION containing a block of switching elements, the outputs of which are connected to the inputs of the first multiplexer group, the inputs of the second group of which are connected to the outputs of the counter group and the inputs of the register group, the outputs of the first group of which are the outputs of the first group of device, the first delay element, the pulse generator , characterized in that, in order to increase the reliability of the device by reducing the likelihood of recording false information, the first, second and third triggers are introduced into it, the second element delays, the first and second one-shot, the pulse shaper and the descrambler, whose outputs are the outputs of the second group of the device, and the inputs are connected to the outputs of the second register group, the input of which is connected to the output of the first trigger, the first input of the first trigger is the input of the device and is connected to the first the input of the second trigger, the output of which is connected to the input of the counter, the output of which is connected to the input of the pulse former, the output of which is connected to the input of the multiplexer and through the first delay element from the first The second input of the third trigger, the second input of which is connected to the multiplexer output, and the output through successively connected first and second single vibrators is connected to the second input of the first trigger, the output of which is the device output, the output of the pulse generator is connected to the first input of the second trigger and through the second delay element with the second input of the second trigger. 05 About CO oo

Description

The invention relates to computing and is intended to manually enter information from a keyboard.

A device for inputting information is known comprising a matrix of switching elements, a switch, a decoder, a counter, a pulse generator, a delay element and a trigger, the first input of which is connected to the output of the delay element, and the second input is connected to the first output of the switch, the trigger output is connected to the first the input element is And, the second input of which is connected to the pulse generator, and the output is connected to the input of the counter, the second output of the switch is connected to the output of the delay element 1.

The disadvantage of the device is low reliability due to the termination of the keyboard scan at the moment the key is touched. In addition, the device cannot be used for operation in the asynchronous data input mode, in a computer due to the bounce of the contacts of the switching elements.

The closest technical solution to the invention is an information input device comprising a pulse generator, the output of which is connected to one of the multiplexer inputs, the other inputs of which are connected to the corresponding outputs of the switching element block, the counter outputs and the register inputs, the outputs of which are device outputs the first and second elements are And, the delay element and the element is NOT, whose input is central with the output of the pulse generator, and the output is with the first inputs of the first and second elements And, second e inputs of which are connected to the output of the multiplexer, the output of the first AND element via a delay element - the third input of the second AND gate, whose output is connected to the other input register. The device provides increased reliability and does not have the bounce of the contacts of the switching elements 2.

However, the known device is critical to the element delays, since the moment of contact is determined by the coincidence of the pulse fronts at the outputs of the pulse generator and the multiplexer, due to the instability of the fronts of these pulses, the multiplexer may have an undefined state when scanning the keyboard, which can lead to false information. In addition, the reliability of the information input is not ensured due to the absence of a sign of pressure, as a result of which, simultaneously pressing the two contact pads simultaneously, the possibility of entering false information is retained. The device does not provide the possibility of software access to the keyboard, there is no indication of information identification, which requires the presence of a keyboard processing program. All this leads to a decrease in the reliability of the device for entering information.

“The purpose of the invention is to increase the reliability of the device by reducing the likelihood of recording false information.

The goal is achieved by the fact that the device for entering information containing a block of switching elements,

0 the outputs of which are connected to the inputs of the first group of the multiplexer, the inputs of the second group of which are connected to the outputs of the counter group and the inputs of the register group, the outputs of the first group of which are the outputs of the first group of the device, the first delay element and the pulse generator, the first, second and third triggers are entered, the second delay element, the first and second one-shot, the pulse shaper and the descrambler, the outputs of which are

0 outputs of the second group of the device, and inputs connected to the outputs of the second register group, the input of which is connected to the output of the first trigger, the first input of the first trigger is the input of the device

5 and connected to the first input of the second trigger, the output of which is connected to the input of the counter, the output of which is connected to the input of the pulse former, the output of which is connected to the input of the multiplexer, and through the first delay element to the first input

0 of the third trigger, the second input of which is connected to the multiplexer output, and the output through the serially connected first and second single-oscillators is connected to the second input of the first trigger, the output of which is the device output, the output of the pulse generator is connected to the first input of the second trigger and through the second delay element the second input of the second trigger.

FIG. 1 is a functional block diagram of the information input device; in fig. 2 - timing charts of the device.

The device contains a multiplexer 1, block 2 switching elements, the first

d delay element 3, register 4, counter 5, second trigger 6, input 7, third trigger 8, first trigger 9, decoder 10, first single vibrator 11, second single vibrator 12, driver of 13 pulses, output 14, outputs 15 of the second group, outputs 16 of the first group, switching elements 17 (capacitive keypads), 18 pulse generator and second 3, delay 19 terminal. The device works as follows. If there is no access to the device for input of information on input 7 (reference bus), the logical input "1" (Fig. 2a) goes to the D input of trigger 6. As a result, the continuous pulse sequence (Fig. 26) generated by the pulse generator 18, through the delay element 19 and the trigger b is fed to the input of the counter 5. The output pulses from the second output (low-order bit) of the counter 5 {Fig. 2c) through the shaper 13 pulses arrive at the strobing input of multiplexer 1 (Fig. 2e). The output pulses of the higher bits of counter 5 (Fig. 2d) are used to form the output code on the first output of the counter. The output code of the counter 5 arriving at the inputs of the second group (address input 1) of multiplexer 1 provides for switching the signal at the corresponding value of this code to the information input of multiplexer 1 at the output of this multiplexer when there is a signal at the gate input of the specified multiplexer. At the output of multiplexer 1 and, respectively, the D output of trigger 8, a sequence of negative pulses is formed, the logical "O (Fig. 2e).

At the C input of the trigger 8 with a delay equal to the delay of the multiplexer 1, receives a sequence of negative (gating) pulses (logical "O) from the output of the driver 13 pulses (Fig. 2D).

Thus, in the absence of contact between the switching element 17, a zero potential is constantly maintained at the output of D-flip-flop 8, as a result of which there is no permission to write into the register 4 of the output code of counter 5.

Touching the switching element 17 (capacitive) by connecting to the corresponding information input of multiplexer 1 an additional capacity of the operator’s body relative to the common point of the device circuit, a negative pulse disappears at the output of multiplexer 1 (Fig. 2e). This occurs at the moment when the state of the counter 5 coincides with the code of the switching element to which it is touched.

At the D input of trigger 8, a logical < 1 > appears, causing it to tip over. The pulse at the output of the trigger 8 (Fig. 2g) with its leading edge ensures the launch of the one-shot 11 with a restart. This one-shot generates a pulse with a duration longer than the keyboard scan period and at least one cycle of circulation, which provides a logical 1 at the output of the one-shot 11 during the entire cycle of pressing the switching element 17 (Fig. 2h).

The front of the pulse from the output of the one-shot And provides the start of the one-shot 12, the output of which forms a short pulse (Fig. 2a), arriving at the first input of the trigger 9, the second input of which receives a logical signal from the input 7 of the device. As a result

at the output of trigger 9, an impulse (Fig. 2k) appears, which, arriving at the clock input of register 4, with its leading edge ensures that the output code of the counter 5 corresponding to the number of the switching element 17 of the switching elements 2 is written to this register. At the same time, the signal from the output of the trigger 9 is output to the output, 14 of the device and is used to determine whether it was touching ("1) or

0 no (“O).

In the case of simultaneous accidental pressing of several switching elements 17 or the appearance of interference at the input of the device, the code register is written to

5 of the switching element 17, which is pressed first. The code of the second switching element is not written to register 4, since the one-shot 11 is already running on; Pressing the first key does not generate a short pulse on you during the one-cycle 12.

One you: ((od register 4 is connected to the input of the decoder 10, at the output of which, and therefore, at the output 15 of the device, a sign of information identification is formed, which allows to distinguish what kind of information goes to the output 16 of the device: digits, data from operation codes , various control commands, etc.

In reverse mode, the logical signal

0 "O, arriving at input 7, blocks the generator of 18 pulses, and hence the counter 5. For a short period of time (2-5 µs), the keyboard scan stops and reading occurs

information.

At the end of the treatment, the positive differential at input 7, and therefore, at the first input of trigger 9, resets it to "O.

Thus, the sign of a click is removed, and the next time the keyboard is read, no data is entered into the computer.

The technical advantages of the proposed technical solution in comparison with the known one consist in increasing the reliability due to a more accurate determination of the moment of contact of the switching element, which eliminates the possibility of an uncertain data state when scanning the keyboard, as well as by forming a sign of a click, which eliminates the recording false information. The introduction of the delay element and the trigger makes it possible to eliminate the possibility of shortened pulses at the input of the counter.

In addition, due to the formation of a sign of information identification, which

5 provides the exception of the keyboard processing program, there is an increase in the reliability of data entry.

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Claims (1)

A device for inputting information, comprising a block of switching elements, the outputs of which are connected to the inputs of the first group of the multiplexer, the inputs of the second group of which are connected to the outputs of the counter group and the inputs of the register group, the outputs of the first group of which are outputs of the first group of the device, the first delay element, pulse generator, characterized in that, in order to increase the reliability of the device by reducing the likelihood of recording false information, the first, second and third triggers are introduced into it, the second element is locked LCD, the first and second one-shot, pulse shaper and decoder, the outputs of which are the outputs of the second group of the device, and the inputs are connected to the outputs of the second group of the register, the input of which is connected to the output of the first trigger, the first input of the first trigger is the input of the device and connected to the first input of the second trigger, the output of which is connected to the input of the counter, the output of which is connected to the input of the pulse shaper, the output of which is connected to the input of the multiplexer and through the first delay element with the first input t its trigger, the second input of which is connected to the output of the multiplexer, and the output through series-connected first and second single vibrators is connected to the second input of the first trigger, the output of which is the output of the device, the output of the pulse generator is connected to the first input of the second trigger and through the second 'delay element to the second the input of the second trigger. SU. ,,. 1160387>