SU983695A1 - Data input device - Google Patents

Description

(54) SOLID DEVICE FOR INPUT INFORMATION CII

The invention relates to information and computing technology and the brain key to be used to enter information from the Keyboard. A device for entering information is described, containing a serially connected keyboard, encoder, shift register and buffer register, control unit, display unit, counter, and comparison circuit 11. The disadvantage of this device is the possibility of distorting the input information due to bounce of keyboard contacts and simultaneous pressing of several keys. The closest solution to the invention is an information input device comprising a keyboard connected in series with a chatter protection unit, an encoder, a buffer register, a memory unit and an action unit, a counter and a control unit, the top of which is connected to the second input of the unit. indication and the input of the counter, the output of the counter is connected to the second input of the memory block 2. The disadvantage of this device is the possibility of distorting the input information due to the simultaneous accidental pressing of several keys, as well as the absence of a choice of recording information in the memory block at the required addresses. The purpose of the invention is to increase the reliability and expansion of the field of application by providing the necessary memory addresses in the amp; The goal is achieved by the fact that a device for inputting information, comprising a serially connected keyboard, a chatter block, an encoder, a buffer register, a memory unit and an indication unit, a first counter and a control unit, the first output of which is connected to the second input of the indication unit and the input of the first counter, the output of the counter psc connected to the second input of the memory block, the trigger, the first and second drivers, the AND element, the second counter and the comparison unit, the first and second inputs of which are connected to the outputs of the first and second counter, vosod - with the first input element And, the second input of which is connected to the output of the trigger and the input of the first driver, the output of the element And is connected to the third input of the memory block - O

and the input of the second driver, the output of which is connected to the first input of the second counter and the installation input to the O flip-flop, the synchronizing and control inputs of which are connected to the second. 5 to the output of the bounce protection unit and the second output of the control unit, respectively, the third output of the control unit connection-. yen with the third input of the second counter, and the output of the first driver connected to the second 20-input buffer register. In this case, the chatter protection unit contains the NAND element, the resistors and the NAND elements of the group, the first inputs of which are the inputs of the bounce protection unit 5 and are connected to the zero potential bus through the resistors, the second inputs of the NAND group elements are connected together With the output of the AND-NOT element, they are the second output of the bounce protection unit 30, the outputs of the AND-NE group members are connected to the inputs of the AND-NOT element and are the outputs of the bounce protection unit group, one of the inputs of the AND-NOT element is one of the inputs of the block 35 from the bounce and through re hist connected to zero potential bus.

FIG. 1 shows a block diagram of the device; in fig. 2 - time 40 diagram of the device.

The device comprises a keyboard 1, a chatter protection unit 2, an encoder 3, a buffer register 4, a memory unit 5, an indication unit 6, the first counter 7, the control unit 8, 5, the trigger 9, the first driver 10, the second driver 11, the element C 12, second counter 13, comparison block 14, AND-NE 15 group of elements, resistors 16, element. AND-NOT 17. 56

The device works as follows.

From the first outputs of the bounce protection unit 2 /., In accordance with the pressed key of the keyboard 1, information signals are received to the inputs of the encoders 55 3 without a bounce with a clear leading edge. In this case, the second output unit

2 bounce protection to the synchronization input of the trigger 9 receives a clock signal, which also has no bounce, and the clock signal has a clear front and rear edges, regardless of the number of keys pressed simultaneously. One of the keys, which is triggered first when you press a few keys, forms the leading edge of the sync signal, the rest

they do not affect, but can only increase its duration (in the time diagram, the signals from randomly pressed keys are shown with the dot-line line).

The control unit 8 causes the control input of the trigger 9 to signal the input from the keyboard 1. On the leading edge of the clock signal, the trigger 9 is set to one state, thereby allowing the coincidence signals from the comparison unit 14 to pass through the And 12 element to the memory block 5. In addition, the first driver, U, on the leading edge of a single signal from flip-flop 9, generates a short write pulse to the buffer register 4, and, regardless of the number of keys pressed, the odds are generated. Only one write pulse is generated, which allows blocking (do not record information from randomly pressed keys, because it is time-wise mixed relative to the leading edge of the sync signal due to the inertia of the mechanical push.

Claims (2)

Information from buffer register 4 is fed to the input of memory block 5. The operation of the memory block 5 and the display unit 6 is controlled by the counter 7 and the control unit 8 from the first output of which pulses are taken at the display frequency. In order to synchronize the recording of information in memory block 5, counter 13 is entered. Information in memory block 5 is copied from buffer register 4 at the time of comparison of the codes at the outputs of counter 7 and counter 13. In addition, counter 13 is controlled directly from control block 8, thereby, selective recording of information is carried out in memory block 5 at the required addresses, which ensures prompt entry of information. On the falling edge of the coincidence signal, coming from the output of the element 12, the second driver 11 generates a reset pulse, which enters the input of the setting at the On trigger 9. The rear edge of the reset pulse transfers the key counter 13 to the leading edge of the sync signal to the next defining the address to be written in the bpok 5 memory information from the keyboard 1 with the next keystroke. Thus, information is successively written into the buffer register 4, rewritten into memory block 5, and then the counter 13 is transferred to the next state. In this case, a constant interrogation of the memory block 5 with the display frequency, regardless of the input of the DIMA information, occurs. The chatter protection unit 2 works on the latching principle, i.e. at the output of the element IS-NOT 17, and accordingly at the outputs of the block of elements IS-NOT 15, the signals change only when the movable contact of the switches of the keyboard 1 is mechanically in contact with the fixed contact, and only the first contact is sufficient, and the contact bounce keyboard 1 does not make changes to the state of the circuit, does not change the state of the circuit and when the moving contact is disconnected from the fixed one by feedback from the output of the AND-NE element 17 to the second inputs of the AND-15 element block and the power source through rezi 16, the presence of which allows the first inputs of the group of elements AND-NOT 15 and the first input of element AND-NOT 17 to feed a single signal of maximum amplitude, which increases the interference resistance of the device. Thus, the input of the encoder 3 and the synchronization input of the trigger 9 receives pure signals with clear leading and trailing edges. The proposed information input device eliminates the possibility of simultaneously pressing several keys, since the result of the action is determined by the first key pressed, which increases the reliability of the device and also makes the keyboard structurally more compact, and also enables address input of information into cells. memory block 5 by a specific program from control block 8. Claim 1. Device for inputting information comprising serially connected keyboard, bounce protection unit, encoder, buffer register, memory unit and display unit, first counter and control unit, the first output of which is connected to the second input of the display unit and the first counter input , the output of the counter is connected to the second input of the memory unit, characterized in that, in order to test the reliability and expand the field of application by ensuring the selection of memory addresses, a trigger, first and second photo are entered into the device gates, AND element, second counter and comparison unit, the first and second inputs of which are connected to the outputs of the first and second meters, the output to the first input of the AND element, the second input of which is connected to the trigger output and the input of the first driver, the output of the AND element is connected to the third the input of the memory unit and the input of the second shaper, the output of which is connected to the first input of the second counter and the installation input to the O flip-flop, the synchronizing and control inputs of which are connected to the second output of the bounce protection unit and the second to move control unit respectively, the third control unit output is connected to a third input of the second ELAPSED ka, and the output of the first shaper connected to the second input of the buffer register. 2. Device pop. 1, the difference is that the chatter protection unit contains an AND-NO element, resistors and AND-NE group elements, the first inputs of which are the inputs of the bounce protection unit and are connected to the ground potential through the resistors, the second inputs of the elements of the IS-NOT group are combined, connected to the output of the element and are the second output of the bounce protection unit, the outputs of the elements of the IS-NOT group are connected to the inputs of the AND-NOT element and are the outputs of the group of the bounce protection unit, one of the inputs of the element NAND is one of the inputs of the d-block rebezga and through resis-. The torus is connected to the zero potential bus. Sources of information taken into account during the examination 1. Author's certificate CXJCP N 648971, cl. G 06 F 3 / O 2, 1979. 2. USSR author's certificate number 651334, cl. G About F 3/02, 1979 (prototype). 1