SU1348811A1 - Information input device - Google Patents

Abstract

The invention relates to computing and can be used when manually entering information. The purpose of the invention is to increase the speed of the device by increasing the frequency of polling the matrix of switching elements. The device contains a matrix of switching elements 1, demultiplexer 2, two multiplexers 3 and 4, trigger 5, pulse generator 6, counter 7, register 8. If none of the switching elements of matrix 1 is closed, the matrix elements are sequentially polled using a pulse generator 6 , counter 7, dsmultiplexer 2 and two multiplexers 3 and 4. When one of the switching elements is closed, the output signal of the trigger 5 blocks the pulse generator 6 and writes the code of the closed switching element to the register 8. the unification of normally open contacts of the matrix of cm-shaped elements via BT (1x multiplexer 4 with the trigger installation input 5, and normally closed contacts via the first multiplexer 3 with the reset input of the trigger 5 allows you to avoid the influence of contact bounce on the operation of the device and therefore increase the polling frequency of the matrix switching elements. 1 ill. C 8 (L 00 4 00 00

Description

The invention relates to computing and can be used when manually entering information.

The aim of the invention is to increase the speed of the device by increasing the frequency of polling the switching elements of the matrix.

The drawing shows the functional diagram of the device.

The device contains a matrix of 1 switching elements, a demultiplexer 2, the first 3 and second 4 multiplexers, trigger 5, generator 6 pulses, counter 7, register 8.

The device works as follows

In the initial state, none of the buttons of the matrix 1 of the switching elements is pressed. Clock pulses from the output of the generator 6 pulses are sent to counter 7, which outputs a sequence of codes to the address inputs of the first multiplexer 3, second multiplexer 4, and demultiplexer 2, ensuring interrogation of the matrix 1 of switching elements. From the output of the second multiplexer 4, a high level signal is sent to the input of the trigger 5 installation, from the output of the first multiplexer 3 a low level signal is sent to the reset input of the trigger 5, which sets the inverse output of the trigger 5 to the state 1 allowing the generator of 6 pulses.

After pressing any button of the matrix of switching elements 1 when entering the address inputs of multiplexers 3, 4 and demultiplexer 2 of the code corresponding to the pressed button, the high level signal from the output of multiplexer 3 is fed to the reset input of the trigger 5, the low level signal from the multiplexer output 4 is fed to the input of the trigger setup 5, which switches and stops the operation of the generator 6. In this case, the code of the pressed button from the output of the counter 7 is written to the register 8 a low-level signal at the inverse of the trigger output 5 output ycrpoiicTBa.

After the button is released, the low level signal from the output of the first mu: of the typelexer 3 returns the trigger 5 to the initial state, allowing the generator 6 to operate and interrogate the matrix 1 of the switching elements.

Interrogation of the matrix 1 of switching elements provides alternate connection of switching elements to the inputs of the trigger 5, thus eliminating the influence of the bounce of the contacts of the switching elements on the operation of the device. This allows to increase the device speed by increasing the clock frequency of the pulse generator 6, which in this case is not limited by the parameters of the switching element, but is determined by the propagation time of the signal for blocking the arrival of the pulse 6 of the generator 6 to the input of the counter 7.

Claims (1)

Invention Formula A device for entering information containing a matrix of switching elements, a pulse generator, a counter, a register, a trigger, the first multiplexer, the output of which is connected to the reset input of the trigger, the output of which is connected to the input of the interlock of the pulse generator, the input of the register register and the gate output of the device the output of the pulse generator is connected to the input of the counter, the outputs of the higher bits of which are connected to the address inputs of the first multiplexer and information inputs of the first register group, the outputs to These are the information outputs of the device, the horizontal buses of the matrix of switching elements are connected to the information inputs of the first multiplexer, characterized in that, in order to improve speed by increasing the polling frequency of the switching elements of the matrix, the device contains a second multiplexer and demultiplexer, the outputs of which are connected to the inputs of the matrix switching elements whose vertical buses are connected to the information inputs of the second multiplexer, the output of which en Fitting to the input flip-flop, the outputs of low bits counter rows are connected to the address input of the second multiplexer and the second information inputs rpyniifii register address inputs connected to dsmultnplrksora The yields Lamno MSB counter poisons invariant fo1) mation phod demultiplexer is connected to zero potential bus.