SU1522188A1 - Device for input of information - Google Patents

Abstract

The invention relates to automation and computing and can be used to enter information from a keyboard. The aim of the invention is to increase the reliability of the input information by blocking the issuance of a sync pulse on the first output of the device in case of pressing two or more keyboard keys. The device for entering information contains a keyboard 1, which includes the first and second groups of isolating elements 2 and 3, a group of elements I4, an encoder 5, a register 6, a decoder 7, two elements NOT 19 and 20, two elements OR 8 I 18 , six elements And 12-17, two triggers 10 and 11, the synchronization input, the first and second groups of information outputs, the first and second clock outputs. The use of the proposed device will improve the accuracy of the entered information. 2 Il.

Description

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The invention relates to automation and supra-rival technology and is intended to enter information into a digital device from a keyboard. The aim of the invention is to increase the reliability of the input information.

Fig. 1 is a block diagram of the proposed device for inputting information; figure 2 - block diagram of the decoder.

The device for entering information contains a keyboard 1, which includes the first and second groups of decoupling elements 2 and 3, the group of elements AND 4 encoder 5, the register 6p decoder 7, the first element OR 8, the one-shot 9, the first and second triggers 10 and 11, the first - the dough elements AND 12-17, the second element OR 18, the first and second elements NOT 19 and 20, the synchronization input 21, the first and second groups of information outputs 22 and 23, the first and second clock outputs 24 and 25. The decoder 7 contains a block of 26 elements NOT, a block of 27 elements AND, a device for entering information and works as follows.

In the initial state, all the switching elements of the keyboard 1 are open, the triggers 10. and 11 are in the zero state, the outputs of the first group of switching elements 2 of the keyboard 1 have high potentials (1), the outputs of the second group of releasing elements 3 of the keyboard 1 , at the outputs of the group of elements And 4, at the outputs of the encoder 5, at the outputs of the decoder 7 and at the output of the First element OR 8 there are low potentials (O). Through the end-to-end transfer circuit, a sync pulse from input 21 through the Fourth element AND 15 and the second element OR 18 arrive at the second clock output 25 of the device and at the clock input of the register 6, through which zero information is recorded in the register 6. At the information outputs 22 and 2 of the device is null information.

When the switching element of the keyboard 1 is closed, the high potential of the decoupling element 2 of the first group of keyboard 1 passes through the closed switching element to the second input, corresponding to

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element 4 of the group, the first input of which contains a high potential of the decoupling element 2 of the first group of keyboard 1, and generates a high potential at the output of the corresponding element 4 of the group, respectively, at the outputs of the group of elements 4 and 4 there is a unitary line code of the closed switching element. The unitary line code of the closed switching element enters the inputs of the encoder 5 and the inputs of the decoder 7 and generates at the outputs of the encoder 5 the binary code of the line of the closed switching element, and the output of the decoder 7 and the output of the first element OR 8 are high potentials. The one-shot triggers a positive front from the output of the first element OR 8: from the output of which a negative pulse with a duration arrives at the synchronization input of the first trigger 10 (,, where D is greater than the bounce time, the trailing edge of which triggers the first trigger 10, and since the information input The first trigger 10 has a high potential from the output of the first element. OR 8, the first trigger 10 is set to one, and the first element, And 12, is resolved and the second element, 13, C, is blocked. The first pulse from the input 21 through the fourth element 15 and the second element OR 18 enters the second clock output 25 of the device and the clock input of the register 6, which records the binary code of the line of the closed switching element into the register 6. In the pause between clock pulses through the first element I 12 sets the second trigger 11 into a single state, which enables the operation of the third element I 14, blocks the fourth element I 15 and generates low potentials at the outputs of the first group of developing elements 2 and The high potentials at the outputs of the second group of decoupling elements 3 of the keyboard 1. The high potential of the decoupling element 3 of the second group of keyboard 1 passes through the closed switching element to the first input of the corresponding element AND 4 of the group, at the second input of which there is a high potential of the unlocking element 3 of the second group of keyboard 1, and forms a high potential at the output of the corresponding element AND 4 of the group, respectively, at the outputs of the group of elements AND 4 there is a unitary column code of the lock nyaty switching element. The unitary column code of the closed switching element arrives at the inputs of the encoder 5 and at the inputs of the decoder 7, forms the binary code of the column of the closed switching element at the outputs of the encoder 5 and retains high potentials at the outputs of the decoder 7 and the first element OR. 8. The high potential from the output of the first element OR 8 enables the sixth element AND 17 to work and through the second element NOT 20 blocks the fifth element AND 16, the sync pulse from input 21 through the third and sixth elements And 14 and 17 enters the first clock output 24 of the device, which is a gating signal for the binary code present at the information outputs 22 and 23 of the device. This sync pulse through the third element I I4 also enters the reset input of the first trigger 10 and, setting it to the zero state, allowing the second element I 13 to work and blocking the first element 12 And. At the end of the clock pulse, the second trigger P also sets to the zero state the

When the switching element of the keyboard 1 opens, at the output of the first element OR 8, a series of impulses from contact bounce appears. The one-shot 9 triggers on a positive front from the first impulse, from the output of which a sync pulse t is received to the synchronization input of the first trigger 10. Since during the time about, at the outputs of the group of elements AND 4, at the outputs of the decoder 7, at the output of the first element OR 8 and at the information input of the first Trigger 10, low potentials are set, the first trigger 10 remains in the zero state. switching element of the keyboard 1 contact bounce is absent, one-shot 9

does not work and the first trigger 10 remains in the zero state,

In the case of two or more switching elements simultaneously in the keyboard line 1, the potentials of the decoder 7 and the first element OR 8 remain low and the one-shot 9 does not work, and 0 the first trigger 10 remains in the zero state. In the case of two or more switching simultaneously elements in the columns of the keyboard 1, the binary code 5 records the lines of the closed switching elements into the register 6, the first and second triggers 10 and II are set to one and low potentials are formed on you of the decoder 0 7 and the first element OR 8, the low potential from the output of the first element OR 8 through the second element NOT 20 allows the operation of the fifth element AND 16 and blocks the sixth element AND 1.7, 5 Sync pulse from input 21 through the third and fifth elements AND 14 and 16 and the second element OR 18 enters the second clock output 25 of the device and the clock register 6, which records the incorrect binary code of the column of the closed switching elements. This sync pulse through the third element And 14 also enters the reset input of the first trigger 10 and sets it to the zero state. After the clock pulse expires, the second trigger 11 is also set to the zero state, 0 Therefore, when two or more switching elements are simultaneously closed and when the keyboard switching element is opened, the device for entering information is set to 5 ready for operation.

The proposed device For entering information, makes sure the accuracy of the input information in the case of the closure of two or more switching elements,

Claims (1)

Invention Formula j A device for entering information containing a keyboard, first and second triggers, an encoder whose outputs are a group of information outputs of the device, a single vibrator, the first and second elements OR, the element NOT, from the first to the sixth elements AND, the information input of the PCR. the trigger is connected to the input of one vibrator and the output of the first element OR, the synchronization input of the First trigger is connected to the output of the one-oscillator, and the direct and inverse outputs are connected to the first inputs of the first and second elements AND, respectively, the installation inputs. and reset the second trigger; connected to the outputs of the first and second elements AND, respectively, and the direct and inverse outputs connected to the first inputs of the third and fourth elements AND, the second inputs of the third and fourth elements AND, and the input of the element NOT It is NOT connected to the second inputs of the first and second elements AND, the output of the sixth element I is the first clock output of the device, so that, in order to increase the reliability of the input information, a group is entered into It And, the register, the decoder and the second element are NOT, the first and second inputs of the group of elements are And are connected to the outputs of the first and second groups of the keyboard, respectively, and the outputs are connected to the inputs of the encoder and the decoder, the outputs of which are connected to the inputs of the first element OR, the output of which is connected to the input of the second element is NOT and the second input of the sixth element And, the first input of which is connected to the reset input of the first trigger, the output of the third element And and the first input of the fifth element And "whose second input is connected to the output of the second e NOT, the outputs of the fourth and fifth elements AND are connected to the inputs of the second element OR, the output of which is connected to the clock input of the register and is the second clock output of the device, the direct and inverse outputs of the second trigger are connected to the inputs of the second and first keyboard groups, respectively, the register outputs are the second group of device information outputs, and the inputs are connected to the outputs of the encoder.