SU1439569A1 - Information input device - Google Patents

Abstract

The invention relates to automation and computing and can be used to manually enter information into processing devices, 1 of the Invention is to increase the speed and reliability of the device. The device for inputting 1 keyboard contains keyboard 1, element AND 6, counter 8, pulse generator 7, element 1111-NOT 13, element OR 4, group of elements OR 14, element NOT 3, RS-flip-flop 5, groups of elements AND 12, multiplexers 2.11, 15. Simultaneous polling of all keys: allows you to completely avoid cross-crawling the entire volume of the keyboard 1. In addition, the failure of one of the multiplexers does not lead to device malfunction. 1 il. i (L

Description

The invention relates to automation and computing and can be used to manually enter information into processing devices.

The purpose of the invention is to increase the speed and reliability of the device ..

The drawing shows a device for entering information for the case of a two-bit counter. TO

The device for entering information contains a keyboard 1, made in the form of switching elements containing moving normally closed and normally open le contacts, | 5 first multiplexer 2, element NOT 3 element OR 4, RS flip-flop 5, element And 6e pulse generator 7, counter 8 strobe the device output 9, information output devices 10, 20 multiplexer groups 11, AND 12 groups, OR-NOT 13 element, OR 14 group of elements, and second multiplexer 15.

The information input device 25 operates as follows.

In the initial state, when none of the keys of the keyboard 1 is pressed, on all selectable inputs of the multiplexer 2.15 and group 11 there are O

Which 1, respectively, at the output of the element OR NOT 13 - logical O,

they inject logical U arriving at their outputs. Accordingly, at the input of the SHSHE-13 element there is a logical | 1 at the output of the g 3 element - a logical O, holding at the direct output of the RS flip-flop 5 log 35 (d chesky 1, allowing the passage of clock pulses from the code of the 7 pulses through Element 6 at the input of Counter 8, on the forward and inverse outputs of which there are levels, the corresponding combination of which allows one to implement all 2 codes simultaneously. At the address inputs of the multiplexers and

40

at the output of the element NO 3 - logical 1, which does not change the state of the H8 trigger 5.

When a moving contact reaches a normally open contact, the key at the second input of the element OR 4 appears logical O. When the first input of the element OR appears

Logical O from the output of the multiplexer 2,15 and group 11 at the output of the element OR 4 is Wits logical O, which will set the R-input of the KZ-flip-flop 5 to the zero state. At the address inputs of the activated multiplexer there is a code corresponding to the number pressed keys. Logical o

from the output (direct) RS flip-flop 5 prohibits the passage of clock pulses from the output of generator 7 through the element 6 to the input of counter 8, which occurs at the output of the working multiplexer 2, T5.11 logical 1 permits the passage through the corresponding group of elements 12 and corresponding to the number of the pressed key, and then through the group of elements OR 14 enters the output buses 10 of the device. In this case, logical 1 from the inverse output of the RS flip-flop

5 enters exit 9 code strobe

and allows polling the output of 10 bits

When the contact returns (movable) to the normally closed contact of the keyboard 1 key, a logical O appears at the output of the first 2 or group 11 multiplexer, and hence the logical O at the output of the HE 3 element enters the S-input of the RS flip-flop 5 and .-, "I will establish the scheme in the original state group 11, all combinations are present. codes that change with every clock cycle by one, and thus all the keys are tracked

keyboard 1 at a time,

I

While holding down any key 1 on the corresponding ce50

Organizing an accelerated search for a pressed key by simultaneously scanning all keys allows you to completely avoid the procedure of scanning the entire keyboard volume, which allows multiple (t-1 times where m is the number of keys in the keyboard) to increase the speed of the device. In addition, the expiration of one of the multiplexers does not make the device as a whole inoperable, and in the limit its operation remains even if there are only 2,15 multiplexers and group 11 inputs remaining and logical 1 enters, and since the address inputs of the multiplexers 2, 15 and group 11 all combinations of 2 codes are present, the logical level appears at the output of the corresponding multiplexer

..

tO

| 5 20

25

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Which 1, respectively, at the output of the element OR NOT 13 - logical O,

35 (d at the output of the element NOT 3 - logical 1, not changing the state of the H8 trigger 5.

When a moving contact reaches a normally open contact, the key at the second input of the element OR 4 appears logical O. When the first input of the element OR appears

Logical O from the output of the multiplexer 2,15 and group 11 at the output of the element OR 4 is Wits logical O, which will set the R-input of the KZ-flip-flop 5 to the zero state. At the address inputs of the activated multiplexer there is a code corresponding to the number pressed keys. Logical o

from the output (direct) RS-flip-flop 5 prohibits the passage of clock pulses from the output of the generator 7 through the element 6 and to the input of the counter 8, which occurs at the output of the working multiplexer 2, T5.11 logical 1 permits the passage through the corresponding group of elements and the 12 code, corresponding to the number of the pressed key, and then through the group of elements OR 14 enters the output buses 10 of the device. In this case, logical 1 from the inverse output of the RS flip-flop

5 enters exit 9 code strobe

and allows polling the output of 10 bits

(d

When the contact returns (movable) to the normally closed contact of the keyboard 1 key, a logical O appears at the output of the first 2 or group 11 multiplexer, and hence the logical O at the output of the HE 3 element enters the S-input of the RS flip-flop 5 and save.

Organizing an accelerated search for a pressed key by simultaneously scanning all keys allows you to completely avoid the procedure of scanning the entire keyboard volume, which allows multiple (t-1 times where m is the number of keys in the keyboard) to increase the speed of the device. In addition, the failure of one of the multiplexers does not lead to the inoperability of the device as a whole, and in the limit its performance remains even if at least one multiplexer remains valid, while only reducing the speed of the device to the prototype level. Thus, along with improving the speed of the device as a whole, its reliability has also increased.

Claims (1)

Invention Formula A device for inputting information containing a pulse generator, an AND element, an OR element, a counter, a keyboard key. the pulse generator is connected to the first input of the element I, the output of which is connected to the input. An RS-flip-flop invert, the inverse output of which is the gate output of the device, the direct output of the RS-flip-flop is connected to the second input of the element And, the output of the element is NOT connected to the S-input RS-flip-flop, outputs of elements And groups of soybeans ineny with one input element or group, the outputs of which 10 are data outputs device outputs the first and second multiplexers connected respectively to the first and Etorm inputs of OR-NO element whose output is connected to the input of NOT n.vtorym. input element OR, characterized in that, in order to improve the speed and reliability of the device, a mulch group is introduced into it, the direct outputs of which connect 2to typelexors, n-2 groups of elements AND, yens with address inputs of the first multiplexer and inputs of the first group of elements AND of the first group, the inputs of the second group of which are connected to the output of the first multiplexer; inverse outputs of the counter are connected with the address inputs of the second multiplexer and inputs of the first group of elements of the second group, inputs of the second group of which are connected with the output of the second multiplexer, the output of the keyboard group is connected to the information inputs of the first and second multiplexers, the keyboard output is connected to the first input of the element OR, the output of which is connected to the R-BXO-plexors of the group. 35 the home of the RS flip-flop, the inverse output of which is the gate output of the device, the direct output of the RS-flip-flop is connected to the second input of the AND element, the output of the element is NOT connected to the S-in, the home of the RS-flip-flop, the outputs of the elements And groups are connected to the same inputs of the elements OR groups whose outputs are informational outputs of the device, the outputs of the first and second multiplexers are connected respectively to the first and the Eight inputs of the OR-NOT element, the output of which is connected to the input of the element NOT the second. input element OR, characterized in that, in order to improve the speed and reliability of the device, it introduced a group of multiplexers, p-2 groups of elements And, plexors group. where n is the number of switching elements of the keyboard, address inputs of group multiplexers and inputs of the first group of elements And the n-2 groups are connected to the corresponding direct and inverse outputs of the counter, the inputs of the second group of elements And the n-2 groups are connected to the corresponding outputs of the multiplexers groups, multiplex outputs the groups are connected to the inputs of the group of the element OR NOT, the outputs of the elements and the n-2 groups are connected to other inputs of the elements OR of the group, the outputs of the keyboard group are connected to the information inputs of the multi