SU980086A1 - Information input device - Google Patents

Description

The invention relates to computing and can be used in electronic digital computers as encoders for keyboard input. Known dynamic encoder containing a clock pulse generator, a scanning counter, a decoder, a multi plexor, an output register. To protect against chattering of the closed contact of the pressed key, a one-shot is used, which provides a delay in scanning the counter until the end of the chatter. A one-time reading of the key travel provides a 90-bit shift register, the contents of which reflect the state of the keyboard, and a comparison circuit for the signals at the output of the multiplexer and 90-bit register, 1 J. The disadvantages of this encoder are the complexity of the circuit, the possibility of bounce information when opening a key contact, and the high speed requirement of the device reading the key code, since there is no feedback between the reader and the information input device. Coordinated work of the encoder with reading devices with low speed complicates the circuit. Closest to the invention is an information input device comprising a clock generator, a scanning counter, a decoder, a multiplexer, a block of switching elements, an output register. Chatter protection is implemented using a K-bit counter, a prohibition element and two triggers. The K-bit counter is filled with counting pulses from the output of the higher-order scan counter. After filling, the prohibition element blocks the access of the counting pulses to the K-bit counter. In the Initial state, the triggers are reset to 0, the counter is full. The signal from the output of the multiplexer, arriving at the counting input of the first trigger, records in it a signal with a unit level from the output of the K-discharge of the counter,. The impulse from the output of the first tripsj connected to the counting input of the second flip-flop sets it in one state, at a time, at the output of the second flip-flop it appears in response to the signal, deactivate the entry of the code into the output register. The press signal, in addition, resets the K-bit counters and pulses belonging to the bounce, sets the first trigger to O, without affecting the second trigger, which is reset to O by an external Reset signal generated after reading information from the output register. After the key is depressed, the K-bit counter is filled and until it is closed, the code of the next key pressed is not recorded on the register trick, preventing this information from failing to open the beat of the key 2, the disadvantage of this device is the redundancy of the output register and two Triggers to form a recording signal, since the key code that is entered in the register is already stored on. the counter and it is enough to block it on Vregl schichit. The purpose of the invention is to control the device. This goal is achieved by the fact that in the device the input input from the formia contains a pulse generator, the first counter whose output is the first output of the device and is connected to the first input of the multiplexer and to the input of the decoder whose output is connected. with the inputs of the switchgear unit whose outputs are connected to the second multiplexer input, the output of the latter is connected to the first input of the second counter, the output of which is connected to the first input of the first prohibition element, the output of the last connected to the second input of the second counter, one of the outputs of the first counter connected to the second input, the first prohibition element, entered the second prohibition element, the element And and the trigger, the first input of which is the input of the device, the output of the pulse generator is connected to the first input of the second element hfe ta, the output of which is connected to the input of the first counter, the first input and the output of the second counter, are sent to the first and the second inputs of the element I, the output of which is connected to the second input of the hooker, the output of the last is connected to the second stroke of the second electronic tape and is locked In the drawing, a block diagram of a device for inputting information is given. The device contains a pulse generator 1, a second prohibition element 2, a first counter 3, a digraph 4, a multiplexer 5, a block of 6 switching elements, a first 7 prohibition, 9, a trigger of the second counter to 8 member 10. The apparatus operates as follows. in the initial state, trigger 10. is set to O. The counting u / pulses from the output of the pulse generator are fed to the counting input of counter 3, interrogating the block 6 of switching elements. Counter. 8 is full. When the contact of the key is closed, the signal from pressing the output of the multi-FXor 5 sets the trigger 10. a single state than stops 3 and resets the second counter 8, the key code is fixed at the outputs of the counter 3. The pulses belonging to the bounce from the contact closure confirm the reset of the counter 8 to O. If the key code has already been read and the Reset signal is received at the first input of the 1O trigger, and the key is not yet depressed, the signal. The following key reads the readout of the next key how the key will be pressed. At the same time, the filling time of the counter 8 is obviously greater than the duration of a single bounce pulse when the contact is opened. In setuchae when the signal Reset will come after otzha-. These keys, bounce when the contact is opened does not affect the operation of the input device, since counter 3 is not blocked yet. If you press several keys simultaneously, the code of the key that the first interrogates counter 3 will be read first. A single trigger is provided by the 1O trigger. A new signal corresponds to the transition of a signal on its output from the zero level to a single one. After reading the key code, the trigger is reset to the zero state. Thus, the output register and the recording unit are added to the device when adding a prohibition element and an AND element, which makes reliability less reduces the cost of a device.

Formula inventions

The information input device containing the pulse generator, the first counter, the output of which is the first output of the device and connected to the first input of the multiplexer and to the input of the decoder, the output of which is connected to the inputs of the switching elements block, which moves are connected to the second input of the multiplexer, output the latter is connected to {the first input of the second counter, the output of which is connected to the first input of the first prohibition element, the output of the latter is connected to the second input of the second counter, one of the outputs of the first account snip is connected to the second input. The first prohibition element, characterized in that, with a simplification panel, a second prohibition element, an AND element and a trigger, the first input of which is the device input, the output of the pulse generator is connected to the first input of the second prohibition element, the output of which is connected to the input of the first the counter, the first trip and the output of the second counter are connected to the first and second inputs of the AND element, the output of which is connected to the second trigger input, the input of the last is connected to the second input of the second prohibition element and is the second output of the device -keeping.

Sources of information taken into account in the examination

i.E2.eciron e-t microEectrdnid

1973, No. 170, p. 55-59. Translation Mi 272 UDC 681.325.53.

2 ,. .Avtor's certificate of the USSR, Proposal No. 2703147, cl. Q06F 3/02, 1978 (prototype).

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SP

Claims (1)

Claim A device for inputting information containing a pulse generator, the first * counter, the output of which is the first ₅ output of the device and connected to the first input of the multiplexer and to the input of the decoder, the output of which is connected to the inputs of the block of switching elements, you-. . the inputs of which are connected to the second input— 10 the house of the multiplexer, the output of the latter is connected to; the first input of the second counter, the output of which is connected to the first input of the first inhibit element, the output of the latter is connected to the second input 15 of the second counter, one of the outputs of the first counter is connected to the second the input of the first inhibit element, characterized in that, with a simplification circuit, the second inhibit element, the 20 And element and the trigger, the first input of which is the input of the device, the output of the pulse generator is connected to the first input of the second of the first inhibit element, the output of which is connected to the input of the first counter, the first input and output of the second counter are connected to the first and second inputs of the And element, the output of which is connected to the second input of the trigger, the output of the latter is connected to the second input of the second inhibit element and is the second output of the device.