SU1173403A1 - Information input device - Google Patents

Abstract

DEVICE FOR INPUT INFO. The MACTIONS containing the pulse generator, the first counter, the decoder, the memory block, the matrix of switching elements and the pulse shaper, the generator output is connected to the input of the first counter, the outputs of which are connected to the address inputs of the first group of the memory block and the inputs of the decoder whose outputs are connected to horizontal buses of the matrix of switching elements, the vertical buses of which are connected to the inputs of the pulse former and the address inputs of the second group of the memory block, the generator input is combined with the input Reading block memory, the outputs of which are the outputs of the device, characterized in that, in order to increase the reliability of the device, an element I is entered into it, a second counter and a switch, the control of which is connected to one of the outputs of the second counter, informational to the pulse driver output and VBKOD (L to the input of the installation in b of the second counter and to the input of the pulse generator, respectively, the inputs of the element I are connected to the output of the pulse generator and to another output of the second counter, whose counting input is connected to the output ele cient I. 00 4; about CD

Description

The invention relates to automation, computing and can be used to enter information into various devices.

The aim of the invention is to increase the reliability of the device.

The drawing shows a block diagram of the proposed device.

The information input device comprises a pulse generator 1, a first counter 2, a memory block 3, a decoder 4, a switching element array 5, a pulse former 6, an And 7 element, a second counter 8, a switch 9.

The information input device operates as follows.

In the initial state, when the switching elements of the matrix 5 are in the open state, the second counter 8 is in the +1 state. A signal that prevents the pulses from the output of the pulse generator 1 to the counter input of the second counter 8 arrives at the input of the And 7 element.

On the second counter 8, corresponding to the state N, with 1 signal is absent. .

At the first output of the switch 9, there is no signal to set the zero of the second counter B to zero, and at its second end, there is a signal that permits the operation of the pulse generator and prohibits information on the outputs of block 3. Counter 2 is switched by pulses of the generator 1, and output.x decoder 4 signals appear that interrogate the rows of a matrix of 5 switching elements alternately

When you click on a yutavish, a certain stitch of the matrix 5 is connected to its specific column, and during the polling of this line, the output of the generator 6 a signal J appears which passes to the information output of the switch 9 and sets the second counter 8 to the zero state. After that, the pulses from the output of the generator 1 through the element And 7. Start to arrive at the counting input of the counter 8. The counters 2 and 8 synchronously change their states, and the signals interrogating the rows of the matrix 5 continue to appear at the outputs of the decoder 4, After N periods operation of generator 1, the signal from the output of the decoder 4 again polls the line corresponding to the pressed key, and the output of the second counter 8, corresponding to the state N, is the control signal of the switch 9. The signal from the output of the generator 6 passes to the second output to mmutatora 9 prohibits operation of the generator 1 and permit delivery of information on unit 3 outputs.

In this case, the first address inputs of block 3 receive signals from the output of counter 2, corresponding to the row number of matrix 5, and the second address inputs of block 3 receive a signal from matrix 5, corresponding to the column. At the output of block 3, the character code corresponding to the pressed key is formed. If two or more keys belonging to the same line are simultaneously pressed, the code at the output of block 3 is not generated because more than one signal is sent to its second address inputs, which corresponds to an erroneous operation device or operator.

When the key is released, the connection of a certain row of matrix 5 with a definite column is disconnected and the shaper 6 stops outputting a signal that blocks the operation of generator 1 through switch 9. Then alternate rows of matrix 5 are interrogated and the second counter 8 goes to its original state N + 1 and the signal from the output corresponding to the IT condition prohibits the passage of pulses through the AND 7 element to the counting input of this counter. The device returns to its original state.

By simultaneously pressing two or more keys belonging to different rows of matrix 5 in one cycle of polling the rows of matrix 5, two or more signals appear at the output of generator 6, which pass through switch 9 and return counter 8 to the zero state, preventing go to the N state and form a signal at the corresponding output. In this case, permission to issue information to block 3 is not received, and the symbol code is not issued.

In the information input device, the protection against double-pressing of keys belonging to one member is ensured by the fact that during one cycle of interrogation of the matrix 5 a signal. Corresponding to keystroke, po311734034

is more than once. Apart from the fact that the connection between the line and the go, the device is protected against the matrix column and should not be interfered with and the contact bounce due to less than one cycle of its interrogation.

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Claims (1)

DEVICE FOR INPUT INFORMATION '' · MADIA, containing a pulse generator, a first counter, a decoder, a memory block, a matrix of switching elements and a pulse shaper, the output of the generator is connected to the input of the first counter, the outputs of which are connected to the address inputs of the first group of the memory block and the inputs of the decoder, the outputs of which are connected to the horizontal buses of the matrix of switching elements, the vertical buses of which are connected to the inputs of the pulse shaper and the address inputs of the second group of the memory block, the input of the generator En with an input Reading a memory block whose outputs are the outputs of the device, characterized in that, in order to increase the reliability of the device, an And element is introduced into it, a second counter and a switch, the control input of which is connected to one of the outputs of the second counter, the information - to the output of the pulse shaper, and the output to the installation input to O of the second ¹ counter and to the input of the pulse generator, respectively, the inputs of the element And are connected to the output of the pulse generator and to another output of the second counter, the counting input of which is connected her to the output of element I. "SU„., 1173403