SU1062676A1 - Information input device - Google Patents

Abstract

A DEVICE FOR INPUT OF INFORMATION, containing switching elements connected to the inputs of the encoder, a register whose information inputs are connected to the outputs of the encoder, and the outputs are the outputs of the device, the element OR, the inputs of which are connected to the outputs of the encoder, the element AND whose output is connected to the control input of the register, which contributes to the fact that, in order to increase the reliability of the device-. by eliminating the influence of the characteristics of the switching elements, loHO contains an EXCLUSIVE | OR element, the first input of which is connected To the output of the OR element, a counter, an awesome input of which is connected to the output of the EXCLUSIVE OR element, a pulse generator, the output of which is connected to the counter input of the counter, the NAND element, the first input of which is connected to the overflow output of the counter and to the first input of the AND element, R5 the trigger, whose R input is connected to the output of the NAND element, and the S input to the regulative input of the register and Yu with the input of the device, the non-inverting output of the R5 trigger is connected to the second input of the NAND element, and the inverting output to the second input of the Element, C ment EXCLUDING OR, and to the second input of the element I.

Description

The invention is related to computing and automation and can be used to enter information into electronic computers (computer) from a keyboard. A device for inputting information is known, consisting of two groups of switching elements, a register encoder and a pulse shaping circuit 1. The disadvantage of such a device is its narrow range of use, due to a link to a specific type of switching elements. The closest in technical essence to the present invention is a device for entering information, containing the components of the ution, the cipher, the inputs of which are connected to the outputs of the switching elements, the register of the normal inputs of which are connected very {to the outputs of the encoder / and the outputs are outputs device, the OR element, the inputs of which are connected to the outputs of the F1 fliter, the element And the output of which is connected to the control input of the register 2. A disadvantage of the known devices is that it can operate IOL when using a switching element with contact bounce,. In the absence of contact bounce, the register is not. set to the initial zero state. The purpose of the invention is to increase the reliability of the device by eliminating the influence of the characteristics of the switching elements. The goal is achieved by the fact that the device for input information, containing switching elements connected to the encoder inputs, the register, information inputs of which are connected to the encoder outputs, and the outputs are: device outputs, the OR element, whose inputs are connected to The outputs of the signal generator and the input And, the output of which is connected to the control input of the register, are entered the element P TURNING OR, the first input of which is connected to the output of the element OR, the counter, which connects the output of the item EXCLUSIVE AND LI, pulse generator, the output of which is connected to the counting input of the counter, AND-NOT element, the first input, of which is connected to the overflow output of the counter and to the first, input of the AND element, -. A 1-15 trigger, p j input of which is connected to the output of the NAND element, and 5 input to the register zeroing input and is the device control input, the non-inverting output of the RS flip-flop is connected to the second input of the NAND element, and inverting - to the second input of the EXCLUSIVE OR element and to the second input of element I. The drawing shows the functional diagram of the device. The device contains switching elements 1, encoder 2, register 3, element OR 4, RS-trigger 5, pulse generator b, element EXCLUSIVE OR 7, counter 8, element AND 9, element 10. In the static state in the absence of signals with the outputs of the switching elements 1, the encoder 2 generates logic outputs O, register 3, RS-trigger 5, counter 8 is in the zero state, and ft - input of the counter is formed from the output element. and EXCLUSIVE OR 7, which prohibits counting. Thus, the device is in standby mode. When the key is pressed, the binary code of the switching element appears at the output of the encoder 2. The code generates the logical output of the element OR 4, which enters the first input of the EXCLUSIVE OR 7 element, the second input of which is set to the logical, from the inverting output R5 of the trigger 5, the output of the EXCLUSIVE OR 7 element is formed. to the counting input of the counter 8 from the output of the generator 6 pulses, I If the switching elements are triggered with a bounce, t, e, when a contact is closed or opened, a series of random amplitude and frequency pulses, then the resolution on the counter input intermittently every new bounce pulse nulls the counter and the counting begins again. Only after the end of bounce, a stable logical O is established at the counter input, the counter counts the required number of pulses and a logical O is formed at its overflow output, which, through an AND 9 element opened at the second input of the logical i from the inverting output R5 of the trigger 5, the input of the register 3, while in the register 3 is written the code of the switching element, from the output of the encoder 2, From the outputs of the register 3 the code goes to the outputs of the device and to the input information buses of the computer, After reading ode computer generates pulse signals the end of reception of the incoming to the service bus zeroed yuschy input register 3 and S -Log RS -triggera 5, with

In this case, the outputs of register 3 are set to the zero state, and the R5 trigger 5 is set to one. Logical

ABOUT

with inverting output

trigger 5 enters the second inputs of the elements EXCLUSIVE OR 7 and. AND 9. At the output of the EXCLUSIVE or 7 element, a logical message appears that blocks the pulse count and zeroes the counter 8. In this state, the circuit remains until the switch element key is released. When lowering the key on the outputs of the encoder 2, and therefore, the output of the element OR 4 is set

In the presence of

are logical

I I

I)

chatter

from the output of the switching element through the encoder 2, the element OR 4, the element EXCLUSIVE OR 7, the disconnecting input of the counter 8 is given an interrupted counting resolution signal (logical О) g only after the end of the bounce on the converting input of the counter 8 a stable logical О, account is set

The tick counts the required number of pulses and at its output overflow logical 1 is generated, arriving at the NAND element 10, opened through the second input of the logical, from the non-inverting output of the R5 trigger 5. At the output of the NAND 10 element, a logical O arrives on the R-input of the R5 trigger 5. The trigger 5 is set to the zero state, at the same time the logical AND

from the direct output of trigger 5. Thus, the schema takes the initial state and is ready to receive the next code,

In contrast to the known, the proposed device works in the same way as described in the absence of bounce in the switching elements, which makes it possible to increase its reliability and be used with switching elements of any type. .

Claims (1)

A DEVICE FOR INFORMATION INPUT, containing switching elements connected to the encoder inputs, a register whose information inputs are connected to the encoder outputs, and the outputs are device outputs, an OR element whose inputs are connected to the encoder outputs, an AND element, the output of which is connected to the control register input, which is different from the fact that, in order to increase the reliability of the device. by eliminating the influence of the characteristics of the switching elements, it contains an EXCLUSIVE OR element, the first input of which is connected to the output of the OR element, a counter whose zero input is connected to the output of the EXCLUSIVE OR element, a pulse generator whose output is connected to the counting input of the counter, the AND-NOT element, the first input of which is connected to the counter overflow output and to the first input of the AND element, the RS-trigger, whose R input is connected to the output of the AND-NOT element, and the 5th input - to the resetting register input and is the control by the device’s input, the non-inverting output of the R5-trigger is connected to the second input of the AND element, and the inverting one is connected to the second input of the element EXCLUSIVE OR and to the second I input of the AND element,