SU959059A1 - Data input device - Google Patents

Description

(54) DEVICE FOR INPUT OF INFORMATION

The invention relates to automation and information technology and is intended to enter information into a computer.

A device for inputting information is known, comprising in series a. input register shnfratorg valve block, information exchange register and delay block 1.

A disadvantage of this device is the complexity of the device due to the presence of a delay unit and a valve unit.

The closest in technical essence to the invention is a device comprising a serially connected keyboard, an encoder and an information register. The inputs of the element OR are connected to the outputs of the encoder / and the output to the single input of the trigger, the output of which is connected to one of. the inputs of the element OR-HB, through the delay element to the other side of the element OR NOT, to the zero input of the trigger and to the input of the inverter. The output of the inverter and the output of the element OR-NB are connected to the inputs of the register 2.

..The disadvantages of such a device are the complexity of building the register and the fact that the storage of information in

The register is provided only for the duration of a key press. This does not allow the register to be used for the long-term storage of information and its display on the display.

The purpose of the invention is to simplify the device.

The goal is achieved by the fact that in a device for inputting information, containing a keyboard, the first output of which is connected to the input of the encoder, a delay element, the output of which through the inverter is connected to the first input of the register, the element OR NOT,

15 entered the element AND-NOT, the first input of which is connected to the output of the encoder, the second output of the keyboard is connected to the first input of the element OR-NOT, the output of which is connected to the input of the element

20 of the delay and with the second input of the element NAND, the output of which is connected to the second input of the element OR NONE and with the second IXIII input of the register, the output of which is the output of the device.

25

FIG. 1 is a block diagram of the device; in fig. 2 - timing diagram of his work: a - a snggsh at the input of the encoder, resulting from the switching of keyboard contacts;

30 in - a signal on about "" to her keyboard bus;

в - signal at the input of the differentiating circuit; g - the signal at the output of the inverter sets the register in O; d - the signal at the inputs of the register when writing the code number.

The device contains a keyboard 1, encoder 2, register 3, trigger 4, elements AND-NOT 5 and OR-NOT 6. Inverter 7, delay element 8, - capacitor 9, first resistor 10, common bus 11, make contacts 12, switches 13 , opening contacts 14, group resistors 15, keyboard outputs 16, power source 17, second resistor 18, switching contacts 19.

The device works as follows.

In the initial state, when none of the switches 13 on the keyboard 1 is turned on, the outputs of the keyboard 16 are low, and on the common bus 11 is high, coming from the power source 17 through the second resistor 18. At the same time, on the outputs of the encoder 2 and at the output of the OR-NOT 6 element there is a low voltage level, and at the outputs of the AND-NOT 5 elements, the inputs of the OR-NOT b elements and the input of the register 3 are high. Trigger 4 is in state O.

When one of the keyboard switches 13 is turned on, pin 1 opens and pin 12 closes with the housing bus. When contact 14 is opened at the outputs of keyboard 16, a signal appears first containing a burst of pulses (in Fig. 2a) arising from the bounce of the switch contacts, and then a high voltage level (Fig. 2a). At time tj, contact 12 is jammed, and the signal shown in FIG. 2 appears on the common bus 11. 26

On the first negative pulse of this signal, the trigger 4 is set to a state, while the output of the element OR NOT 6 sets a high voltage level that is applied to the delay element 8, which forms a short positive pulse to the inverter 7. From the output of the inverter 7 is negative (Fig. 2d) is fed to the input of register 3 and resets it to its initial state. From the output, the element OR-NOT 6 is supplied to the inputs of the elements AND-NOT 5 permitting potential, a high voltage level, and starting from the moment tj on the outputs of the K-NE 5 elements defined by the binary code of a number, a low voltage level is set bounce pulses (Fig. 2d), which ensures that the code of the number is written to register 3.

When the keyboard switch 13 is turned off, contact 1 opens 12, and contact 14 closes, on the common bus 11, and then on the keyboard inputs, initial voltage levels are set, accompanied by the appearance of bounce pulses (t.tg in Fig. 26 and 2a respectively).

The presence of chatter on the common bus 11 does not change the state of trigger 4, which is maintained by the presence of a low voltage on one or more inputs of the element OR NOT until the time point b5- (fig.2a At the time tj, the first negative pulse of chatter on the outputs Keypad 16 causes the appearance of high voltage levels at all the outputs of the AND-NOT 5 elements and, accordingly, at all inputs of the OR-NOT element, and at its output a low voltage level appears that prohibits the passage of bounce pulses at the inputs of the register 3 and is set Initiating trigger 4 to its initial state. At the same time, a negative voltage drop at the input of delay element 8 does not force the reset of the register 3 reset pulse.

As can be seen from the voltage diagrams (Figs. 2a, 2e), the chatter pulses present at the outputs of the keyboard 16 and at the outputs of the encoder 2 are absent at the inputs of the register 3, which simplifies the device and eliminates the limitations in selecting the structure of the register 3. is stored in register 3 until the next number is written, so register 3 can be used not only for exchanging information with another device, but also for other functions, for example, for outputting the recorded information to indicator elements. This allows electronic equipment to be reduced by about 15%, since the considered construction of the device circuit simplifies register 3, eliminating 4 elements 2I-NOT every decade needed in register 3 (prototype) to provide information recording.

Claims (2)

1. Author's certificate of the USSR 612237, cl. G 06 F 3/02, 1976. 2. Authors certificate of the USSR, 531146, cl. G 06 F 3/02, 1974 (prototype), Rig.