SU1104494A1 - Information input device - Google Patents

Abstract

1. A DEVICE FOR INPUT OF INFORMATION containing a multiplexer, a pulse generator, a counter, a register, a pulse shaper and switching elements connected to the information inputs of the multiplexer, the register outputs are information outputs of the device, the counter input is connected to the output of the pulse generator, and the outputs are to the address outputs multiplexer inputs and information inputs of the register, characterized in that, in order to increase the reliability of the device by providing protection against bounce of switching elements, in devices A threshold element, a load element, a strobe signal generator and the first storage element are introduced, the output of the pulse generator is connected to the input of the pulse generator and the switching elements, the output of the pulse generator is connected via a threshold element to the clock input of the strobe signal generator, through the first storage element - with a common bus and through the load (Loop element - with a gate input of the register, the output of the gate signal generator is the gate output of the device and is connected to the gate the input of the register, the output of the multiplexer is connected to the information input of the strobe signal generator. 4 t; o 14

Description

2. The device according to claim 1, characterized in that the strobe signal former contains the first and second triggers, element 2 AND-NOT, the first and second keys and the second accumulative element, the first and second installation inputs of the first trigger are respectively the information inputs of the imager non-inverting output are connected to the installation input of 1 of the second trigger, the inverting output to the control input of the first key, respectively 104494

the tenant input of which is connected to the common bus, and the output to the first input of element 2 AND-NOT and to the potential input of the second key connected via the second accumulator element with the common terminal, the output of the second key is connected to the second input of element 2 AND-NOT, output whom

connected to the input of the installation in O

the second trigger, the output of which is connected to the control output of the second key and is the output of the driver.

The invention relates to computing and is intended for use in the construction of control systems and information input. It is known a device for entering informada, which uses transistor-transistor logic integrated circuits with sequential polling of keys as sensitive elements. Such a device contains a clock generator, a binary counter, to the counting input of which clock pulses are received, a circuit of sensitive elements (multiplexer) and an output register. The control parameter — the capacity of the operator’s finger — is connected to the free (floating) input of the NAND gate when the key is touched. Cyclic polling of the keyboard keys is performed with the lj pressed. The disadvantage of the device is low reliability, i.e. In-like devices, indistinguishable once and repeatedly pressing the same key, due to the fact that the counter counts external independent sync pulses. Therefore, as soon as the keystroke is polled, the key code will always be entered into the output register. The number of such entries depends on the duration of pressing the SSS key. In addition, the device does not provide any protective measures to prevent bounce, ha. The closest in technical essence to the invention is an information input device comprising a multiplexer, a pulse generator, a counter, a register, a pulse shaper and switching elements connected to the information inputs of the multiplexer, the register outputs are information outputs of the device, the counter input is connected to the generator output pulses, and outputs - to the address inputs of the multiplexer and information inputs of the register. The aim of the invention is to improve the reliability of the device by providing protection against bounce of switching elements. This goal is achieved in that the information input device containing a multiplexer, a pulse generator, a counter, a register, a driver and switching elements connected to the information inputs of the multiplexer, the register outputs are information outputs of the device, the counter input is connected to the output of the pulse generator, and outputs - to the address inputs of the multiplexer and information inputs of the register, a threshold element, a load element, a strobe signal generator and the first storage element, an output are introduced The pulse generator is connected to the input of the pulse generator and to the switching elements, the output of the pulse generator is connected via a threshold element to the clock input of the strobe signal generator, through the first storage element - to the common bus and through the load element - to the strobe input of the register, the input of the gate signal generator is the gate output of the device and is connected to the gate input of the register, the output of the multiplexer is connected to the information input of the gate signal generator. The strobe signal generator contains the first and second triggers, element 2 AND-NOT, the first and second keys and the second accumulative element, the first and second setup inputs of the first trigger are respectively the clock and information inputs of the imager, the non-inverting output is connected to the setup input in 1 of the second trigger, the inverting output - with the control input of the first key, the potential input of which is connected to the common bus, and the output - to the first input of the element 2 AND-NOT and to the potential input of the second key connected through Torah storage element to a common bus, the second switch output CONNECTION nen to the second input element 2 and the NOR output of which is connected to the setting input of a second flip-O, whose output is connected to the control output of th present second key and is output shaper. Figure 1 shows the circuit diagram of the device / fig, 2 - switching elements; on fig.Z - the strobe signal driver circuit. The scheme contains a pulse generator 1, switching elements 2, a multiplexer 3, a pulse shaper 4, a strobe signal shaper 5, a counter 6, a register 7, a threshold element 8, the first accumulator element 9, a load element 10, a ring of common total 11, a contact area 12, inertial element 13, element 14 of one-sided conduction, resistor 15, first and second trigger 16 and 17, first and second keys 18 and 19, element 2 AND-NOT .20, second accumulator element 21. The device operates as follows. The element 14 and the resistor 15 connected to the contact pads 12, surrounded by a common bus ring 11 (figure 2), receive pulses from the generator of the 1 pulses. The same pulses are fed to the input of the imager 4 and the clock input of the counter 6. At the moment when the counter contains the binary code corresponding to the pressed key, the driver 5, the gate signal is abating the potential, is the output signal writing the binary code of the counter to register 7, the outputs of which are the information outputs of the device and the feedback signal supplied to the storage element 9 through the element 10. Due to the fact that the charge entering through the element 10 to the storage element 9, increases the voltage rise rate on the element 9, the output of the threshold element 8 is the phase shift of the signal entering the imaging unit 5, which is equivalent to an increase in sensitivity by pressing a key, i.e. positive feedback is triggered, which leads to the appearance of sensitivity hysteresis and completely eliminates the phenomenon of chatter. The strobe signal generator 5 generates a potential, which is a device strobe signal and a Positive feedback signal when a touch is recorded on the pad. A latching trigger 16 is fed to the latching clock, and to the information input a signal, the phase of which is fixed. If the latching phase lags behind the phase of the signal applied to the information input of the trigger 16, its output is in the state of logical 1, the trigger 17 in the state of logical O, the element 21 through the key 19 and the output of the trigger 17 is discharged. If there is an advance of the phase of the latch relative to the signal applied to the information input of the trigger 16, then the time is still ahead of the advance, and the output of the trigger 16 is in a logical state O, as a result, at the output of the trigger 17, which is the output of the device logical 1. Key 18 opens and removes the charge from accumulation element 21 each time there is a tact phase advance

fixation relative to the fixed signal. If the lag phase of the latch relative to the latching signal starts, charge 21 accumulates on the element 21 until the voltage threshold of the element 2 AND –NE 20, the output of element 2 AND –NE appears logical O and sets the trigger 17 to the state O. The signal from the output of the trigger 17 opens the key 19 and discharges the cumulative element 21.

The introduction of new elements and connections in the device made it possible to increase its reliability, since bounce was completely excluded (possible in the prototype if the duration of the interference exceeds the time worked by the delay element), since the invention provided a hysteresis of sensitivity due to the formation of a positive feedback feedback switching on limiting resistance.

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Claims (2)

1. DEVICE FOR INFORMATION INPUT, containing a multiplexer, pulse generator, counter, register, pulse shaper and switching elements connected to the information inputs of the multiplexer, the outputs of the register are information outputs of the device, the counter input is connected to the output of the pulse generator through the first storage g Fig1 owls, and outputs - to the address inputs of the multiplexer ^g and data inputs of the register o.tlichayuscho Esja in that, in order to increase the reliability of the device by providing protection against bounce switching elements incorporated in the device threshold element terminating element strobe shaper the signal and the first storage element, the output of the pulse generator is connected to the input of the pulse shaper and to the switching elements, the output of the pulse shaper. is connected through a threshold element to the clock input of the strobe signal , the element - with a common bus and through the load element - with the gate gate of the register, the output of the gate signal generator is the gate gate of the device and connected to the gate gate of the register, the multiplexer output is connected to the information input of the gate signal. 2. The device according to claim 1, characterized in that the driver of the strobe signal contains the first and second triggers, element 2 AND NOT, the first and second keys and the second storage element, the first and second installation inputs of the first trigger are respectively the information inputs of the driver, the non-inverting output is connected to the installation input in 1 of the second trigger, the inverting output is connected to the control input of the first key, the potential input of which is connected 1 to the common bus, and the output to the first input of element 2 AND-NOT and to the potential the second key is connected through the second storage element with a common bus, the output of the second key is connected to the second input of the AND-NOT element 2, the output of which is connected to the installation input in O 'of the second trigger, the output of which is connected to the control output of the second key and is the output of the driver .