SU1539762A1 - Information input device - Google Patents

Abstract

The invention relates to computing and can be used to enter information from a keyboard in automated control systems. The purpose of the invention is to simplify the device and increase its reliability. The device contains a keyboard, an encoder, an AND element, two OR elements and a one-shot, a counter, a trigger and a memory block. The trigger on the control signals of the keyboard fixes the operation mode of the device. By pressing the information key, the encoder generates a code that is entered into the memory block at the address corresponding to the state of the counter. After the information array is formed at the following address, the sign of the array end is entered into the memory, the counter is reset and the memory scan is started in the output mode. When the end of the array character is reached, the memory query is blocked. 2 Il.

Description

The invention relates to computing and can be used to enter information from the keyboard in automated control systems.

The purpose of the invention is to simplify the device.

Fig „1 shows a functional diagram of the device; figure 2 - timing charts of the device.

The device (FIG. 1) contains a keyboard 1, an encoder 2, an element AND 3, a first element OR 4, a first 5 and a second 6 one-shot, a counter 7, a trigger 8, a memory block 9, a second element OR 10, an output 11 of a device request, information output 12 and the synchronous input 13 of the device.

Na1 figure 2 indicated: a - signal Reception; b - Issue signal; to the SI signal; g is the request signal of the encoder 2; d is the write signal to memory block 9 from the output of the one-shot 6; e is the increment signal of the counter 7 from the output of the element OR 10; g is the state of counter 7; h - output of memory block 9; and - output of one-shot 5; к - trigger output 8 „

The device works as follows.

On the Receive signal (Fig. 2a), the counter 7 and the trigger 8 are set to the zero state (Fig. 02, k). When the information key of the keyboard 1 is pressed, the encoder 2 generates a binary code on its information output and exposes the request signal (Fig. 2d). With the failure of pressing simultaneously two information keys encoder

2 forms the key code of the highest priority

The request signal through the OR 4 and 10 elements is fed to the single vibrator 6 and the counter 70, respectively. the trailing edge (Fig. 2e) of the counter is modified (Fig. 2g). The next time you press the information key, the information is entered into memory block 9. In this case, the zero information state of the output signal is entered via the second information input.

After the device is loaded, the keyboard 1, when the corresponding key is pressed, issues the Issuing signal of FIG. 2b through the OR 4 element, it goes to the one-shot 6 and, at its leading edge, generates a write signal to the unit 9 of the single state memory at its second information input (FIG. 2z) at address N, where N is the number of previous information parcels. On the falling edge of the signal, the output pulse generates a single vibrator 5 (figs 2i). On it, the counter 7 is triggered and the back edge of the ci signal (figv) trigger 8 is set to one e (fig.2k) "For reliable operation it is necessary that the pulse width generated by the first odnovibrato- rum, exceeded 1.5 TAS"

Upon the installation of trigger 8 from output 11, a request signal for issuing information is issued. Element And 3 allows the passage of the SI signals through the element OR 10 on the increment of the counter 7 (Fig.2E). Memory block 9 is interrogated from the zero address at address L-1. The read information from the first output of the memory block 9 is output to output 12. When the memory block 9 is sampled and at address N, a single state is set at the second output of memory block 9. According to it, the trigger 8 is reset, respectively, the request signal for issuing information at output 11 is reset.

0

about Q

five

and the flow of SR signals to the synchronous input of the counter 7 is blocked.

Thus, information from the keyboard is stored in the memory and after its issuance the interrogation of the memory block is blocked.

Assigning the functions of a counter and comparator unit to the memory unit simplifies the device and increases its reliability.

Claims (1)

Invention Formula A device for entering information containing a keyboard, an encoder, a memory unit, an AND element, the first OR element, two one-shot, a trigger and a counter, the outputs of which are connected to the address inputs of the memory unit, the outputs of the group of which are information outputs of the device, information outputs of the keyboard connected to the inputs of the encoder, the information outputs of which are connected to the information inputs of the memory block group, the first control output of the keyboard is connected to the first inputs of the reset, the counter and the trigger, the output of which is The output of the device request is characterized in that, in order to simplify the device, it contains a second OR element, the output of which is connected to the clock input of the counter, the control output of the encoder is connected to the first inputs of the first and second elements OR, the second control output of the keyboard is connected with the information input of the memory unit, the second input of the first element OR, and the input of the first one-oscillator, the output of which is connected to the second reset input of the counter and the information input of the trigger, the output of which is connected to the first input the home of the AND element, the output of which is connected to the second input of the second element OR, the second input of the AND element is combined with the clock input of the trigger and is the synchronization input of the device, the output of the first OR element is connected to the input of the second one-oscillator, the output of which is connected to the recording input of the memory block, the output of which is connected to the second trigger reset inputs 1 t