RU1798776C - Device for input and output of information - Google Patents

Abstract

Usage: keyboard input devices. SUBSTANCE: device comprises: keyboard (1), control unit (2), encoder (3). code converter (4), display unit (5). 1- 3-2-4-5, 3-4. 5 ill.

Description

The invention relates to computing and can be used in keyboard input devices.

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

Figure 1 shows the functional diagram of the device; Fig. 2 is a diagram of a control unit; Fig. 3 is a code conversion diagram; in Fig. 4 is a timing diagram of the operation of the device; figure 5 - diagram of the encoder.

The device for inputting information (fi 1) comprises a keyboard 1, a control unit, an encoder 3, a code converter 4, an indication unit 5, a shift register b.

The device also contains a group of code buses 8, a write bus 9, a shift bus 10, a control bus 11, an information attribute bus 12, a group of indication buses 13, a clock bus 14, an information bus 15, a reset bus 16.

The control unit 2 (Fig. 2) contains a pulse generator 17, a trigger 18, a register

19 shift, four elements NOT 20-23, element OR 24, element AND-OR-NOT 25.

The device operates as follows.

The operation of the device is illustrated by encoding keys with a hexadecimal code, i.e. when each key is encoded in four digits and the number of keys is 16.

When the device is turned on in the control unit 2 of the pulse generator, clock pulses are generated, which, when passed through the element HE 20 to the C-input of the trigger 18, set it to its initial zero state. In this case, the R-shift register 19 is set to zero. The zero output of flip-flop 18 controls the operation mode of shift register 26 (Recording - high potential level, Shift - low). The single output of trigger 18 is the serial input of shift register 19 and its R-input. When you press a key on the keyboard 1 on the corresponding bus 7 low

Xi

09 X | XS

potential with the eliminated bounce of contacts arrives at the input of the encoder 3. On the output buses 8 of the encoder 3, the binary code of the pressed key is generated, and on the bus 12 there is a positive potential of the group signal, which is generated by pressing any key. This signal through the element 21 to the recording bus 9 records the binary key code of the key, which through the group of code buses 8 enters the converter. 4 codes. With a positive edge of the signal from the output of the element HE 20, in the presence of a positive signal on the bus 12, the trigger 18 is set to one state, the zero output of which sets the shift mode of register 26, and the positive potential (one) at the serial D-input of the shift register 19 is set to a single output. In this case, the clock pulses of the generator 17, arriving at the C-input of the shift register 19, shift the unit installed on its d-input, sequentially in the 1,2,3,4,5th bit of the register 19. Positive signal 5- the discharge through the elements NOT 23 and 24 resets the trigger 18, the single output of which is set to the zero state of the shift register 19 and the unit is removed from the D-input

The first bit of the shift register 19, which controls the passage of clock pulses from the output of the element NOT 20 through the AND-OR-NOT 25 element, passes to the output of the element. AND-OR-NOT 25 four clock pulses that pass through the element 22 through bus 10 to the shift input of the registers 26-28 of the code conversion unit 4. Thus, the skin of the pressed key recorded in the 1-4th bit of the register 26 is shifted to the 1-4th bit of the register 27. At the same time, this code is transmitted to the input of the register b located in the computer via the information serial bus 15. The reception of this code in register 6 is carried out by clock pulses arriving on bus 14 from the output of the AND-OR-NOT 25 element. When we press the next key on keyboard 1, the code is promoted in registers 26-28 and computer register 6 with the code written in these registers regular keys. Thus, by successively pressing the corresponding keys, it is recorded in register 6. Computer code of the required bit,

An indication unit 5 is connected to the output buses 13 of the registers 27.28, which allows you to visually monitor (for example, on lamps or seven-semitite indicators) the sequentially dialed information code.

If it is necessary to change one full-bit code to another, there is no need for preliminary resetting of shift registers 26-28, 6.

Newly arriving code drives out the old code from the registers. At the same time, the Reset signal received via the reset bus 16 to the input of the AND-OR-NOT 25 element allows transmission of register shifts 27.28 to the inputs

6 series of pulses with which these registers are reset.

The frequency of the pulse generator 17 is not standardized, but it should allow the Reset signal to the minimum possible

5 time of pressing the key (time of the order of 10-40 ml / s) to form the number of pulses, not less than the number of bits in the full-sized information code,

Device operation when writing code

0 1111. is illustrated by a timing chart in Fig. 4. If necessary, source code can be encoded in a binary decimal system.

Thus, to transmit the serial code from the input device to the computer in the inventive device, special equipment is not required for generating self-synchronizing codes. At the same time, this is a prerequisite in the prototype, since the generated serial code is transmitted without synchronizing pulses. In addition, to reduce the reliability of the prototype device is also the possibility

5 issuance of a false code 0 ... 0 from the device to the computer when the operator manually generates the START signal, which does not occur in the proposed device. .,

Claims (2)

The claims 0 1, An information input device comprising a keyboard, an encoder, a code converter, an indication unit, a control unit, keyboard outputs connected to the information inputs of the encoder, 5, the group outputs of which are connected to the information inputs of a code converter, the information outputs of which groups are connected to the inputs of the display unit, the control reset input is 0, the device reset input, the first and second outputs of the control unit are respectively the write and shift inputs of the code converter, the encoder output is connected to the write input of the control unit 5, characterized in that, in order to increase the reliability of the device, the third output of the control unit is connected to the control input of the code converter, the fourth output of the control unit is the synchronization output of the device, the information output of the code converter is the information output of the device. 2. The device according to claim 1, with the proviso that the control unit comprises a pulse generator, a trigger, a register, four elements NOT, an OR element, an AND-OR-NOT element, the output of which is the fourth output of the block, the output of the pulse generator is connected to the input of the shift register and through the first element NOT to the sync input of the trigger and the first and second inputs of the AND-OR-NOT element, the output of which is connected to the input of the third element 0 NOT, the output of which is the second output of the block, the trigger information input, the first input of the OR element and the input of the second element are NOT the first output of the block, the output of the OR element is connected to the trigger reset input, the direct output of which is connected to the information input and the register reset input , the inverse trigger output is the third output of the block, the first output of the register is connected to the third input of the AND-OR-NOT element, the second output of the register through the fourth element is NOT connected to the second input of the OR element, the fourth input of the AND-OR-H element E is a block reset input. pu l  zm | 38M .J Figure 1 figz , / ate 7 m well d w% U8 At 1 i tr-