RU2547217C2 - Serial interface for controlling multibit character display - Google Patents

Abstract

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to input/output devices of microcontroller devices and is used to control multibit displays. Disclosed is an interface for controlling a multibit character display, comprising a shift register with serial data input and parallel output. The control interface comprises a paraphrase switch controlled by a serial interface data line. The control interface further includes a switch in the display power circuit, connected in series with the paraphase switch, and a threshold element. The input of the threshold element is connected to an interface synchronisation line and the output controls the switch. The switch is closed when the synchronisation line is active.

EFFECT: high reliability of controlling multibit display devices.

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Description

DESCRIPTION OF THE INVENTION

G06F003 / 14

TITLE:

SEQUENTIAL CONTROL INTERFACE OF A MULTI-DISCHARGE SYNTHESIS SYNTHESIS INDICATOR

FIELD OF TECHNOLOGY:

The invention relates to input-output devices of microcontroller devices and is used to control multi-bit indicators.

BACKGROUND OF THE INVENTION:

A known method of controlling multi-bit indicator devices using the shift register [L1]. Disadvantages - three control buses (lines) and the need to transmit and store additional information about the position of the active display elements, which increases the load on the control device.

A known method of controlling indicator devices based on the shift register [L2]. The disadvantage is the inability to use in multi-bit devices due to the inevitable spurious illumination of inactive display elements during the recording / regeneration of information, the intensity of which depends on the number of discharges.

SUMMARY OF THE INVENTION:

The invention, while retaining all the positive properties of the method [L2], allows it to be used in multi-bit LED display devices, reduces the cost compared to [L1], due to the transition to a two-wire control circuit and the rejection of the use of shift registers with a storage register.

To solve this problem, a device [L2], containing a shift register with serial data input and a parallel output, a paraphase key controlled by a serial data line (SD) of the interface, introduces a serial key (1) controlled through a threshold element (2) by a synchronization line shift register, and the key included in the power supply circuit of the indicators is open during the activity of the synchronization line (Fig. 1). This ensures that the power of the light-emitting elements is turned off while the data is being updated.

EFFECT: increased reliability and efficiency due to the simplest algorithm and control scheme for a multi-bit indicator.

LIST OF FIGURES:

FIG. 1 - Functional diagram

FIG. 2 - Schematic diagram

INTELLIGENCE:

In FIG. Figure 2 shows an example of a practical implementation of a two-wire interface of a microcontroller device, with the help of which a 2N-digit seven-segment LED indicator is controlled.

BIBLIOGRAPHY:

1. Dynamic indication of a 9-bit indicator on a serial bus http://eldigi.ru/site/periphery/5.php

2. RF patent No. 2390048, FIG. 2

Claims (1)

A multi-digit sign-synthesizing indicator control interface containing a shift register with serial data input and a parallel output, a paraphase key controlled by a serial data line (SD) of the interface, characterized in that a key (1) is additionally inserted into it in the power supply circuit of the indicators, in series with a paraphase key and a threshold element (2), the input of which is connected to the synchronization line (CLK) of the interface, and the output controls the key (1), and the key (1) is open during synchronization line activity.

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