SU1430948A1 - Information input device - Google Patents

Abstract

The invention relates to automation and computing and can be used in keyboard consoles of various systems. The purpose of this invention is to simplify and increase the reliability of the device. The device contains a keyboard I, which consists of a set of keys connected by horizontal and vertical tires, counters 2 and 10, a generator of 9 pulses, a distributor of 5 pulses, which consists of counter 6 and a decoder 7, trigger 4, element 11, demultiplexer 8 and multiplexer 3. Introduction to the device of the demultiplexer 8, the distributor 5 pulses and the counter 10 simplifies it and increases the reliability of operation. 1 hp f-ly, 2 silt se

Description

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The invention relates to automation and computing and can be used in keypads of various systems.

The purpose of the invention is to simplify and improve the reliability of the device.

FIG. I depicts an electrical functional diagram of the proposed device; in fig. 2 - time diagram of the device.

The device contains a keyboard 1, which consists of a set of keys connected by horizontal and vertical tires, the first counter 2, multiplexer 3, trigger 4, distributor 5 pulses, which consists of counter 6 and decoder 7, demultiplexer 8, pulse generator 9, the second counter 10, element NOT 11, informational code 12 of the device and output i 3 - Sign of the availability of information,

The device works as follows.

In the initial state, all keys of keyboard 1 are open. After switching on the power supply, the generator 9 removes the pulses that are fed to the input of the distributor 5 pulses. The distributor receives pulses to the input of counter 6 and to the input of the high-order bit of the decoder 7. Signals from the output of counter 6 are fed to the input of the lower bit of the decoder7. At the exit About the decoder 7 you- 35

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working the first pulse sequence, and at output 1, the decoder 7 produces a second pulse sequence that is shifted relative to the first half of the following period from C outputs O of the decoder 7 pulses arrive at the counting inputs of counters 2 and 10 and at the reset input of the trigger 4, which is set to zero s, From the trigger output 4, the zero signal is fed to the reset input of the counter 10 "Under the action of pulses arriving at the counting input, the counter 10 changes its state until at its transfer output e ustanovits single signal which "arrives at the input of NOT circuit 11 is inverted and input to an account authorization counter 10 and prohibits the further expense of W gpulsao From the output counter signal transfer unit 10 is input to an account authorization schetchi40

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ka 2 and allows him to count pulses. Counter 2 changes its state after passing each pulse at its counting input, performs a complete enumeration of information codes. Signals from the lower bits of counter 2 arrive at demultiplexer 8 address paths, the outputs of which are connected to horizontal keyboard buses 1, whose vertical lines connected to the information inputs of the multiplexer 3, whose address inputs are connected to the higher bits of the counter 2 When you press the keyboard 1 key and the code 2 is set at the outputs of the counter 2, the code corresponding to the code pressed the keys, the pulses from the output G of the decoder 7 pass through the demultiplexer 8, the closed contact of the pressed key and the multiplexer 3 to the input of the trigger 4, which generates a reset signal of the counter 10. Counter 10 resets, a zero signal is set at its transfer output, which arrives at the entrance of the destruction of the count of the counter 2 and prohibits it from further account. At the output of counter 2, the code corresponding to the pressed key is fixed. From the transfer output of counter 10, a zero signal arrives at the input of the element 11, the output 13 of which releases a signal Sign of availability of information, which enters the input of the resolution of the account of counter 10 and permits it to pulse .

The counter 10 is reset in each cycle of operation of the decoder 7, except for those cycles in which contact is lost in the pressed key. If the contact loss lasts (2 - J) cycles, the signal Signs the presence of information is removed and the device assumes the initial state t. For the duration of the action at the signal output 13, a sign of the presence of information, at the output 12, the code corresponding to the pressed key is held,

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Introduction to the device of the demultiplexer, the distributor 1 {mpuls and the second counter simplifies the design of the device and increases the reliability of its operation.

The impulse distributor eliminates false frauds, as it provides diversity-time mo3

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The second counter eliminates the influence of the keyboard contact's key when pressing, releasing and holding the key for a long time on the reliability of the obtained insight.

Claims (1)

Formula I o A device for entering information containing a keyboard, a first counter, a pulse generator, a trigger, a multiplexer, the address inputs of which are connected to the senior bits of the first counter, and the information inputs connected to vertical keyboard buses, which are This is because, in order to simplify and increase reliability, a pulse distributor, a demultiplexer, a NOT element and a second counter are entered into it, and the counting input of the second counter is connected to the counting input of the first counter, with the trigger reset input and with the first output pulse distributor, the output of the pulse generator is connected to the input of the pulse distributor, the second output of which is connected to the information input of the demultiplexer; 14309484 the bits of the first counter are connected 0 five 0 five 0 The address of the first counter is connected to the transfer counter of the top counter and the input of the element NOT, the output of the element is NOT connected to the input of the resolution resolution of the second counter, and is an output Sign of the presence of the mini-formation of the device, the codes of the younger and the higher bits of the first counter are informational outputs of the device, the reset input of the second counter is 4} with the forward trigger output, the trigger setup input is connected to the multiplexer output, the demultiplexer outputs are connected to horizontal keyboard ips. 2, The device according to claim 1, wherein the pulse distributor comprises a counter and a decoder, the counting input of the counter being connected to the higher bit input of the decoder and being the input of the pulse distributor, the counter output is connected with the low-order input of the decoder, the first output of the decoder is the first output of the pulse distributor, and the second and the output is the second output of the pulse distributor. ten( CPU g