KR20020088601A - Input key system - Google Patents

Abstract

PURPOSE: A key input system is provided to process a plurality of key input signals by using input keys whose signals are transmitted to a microcomputer via an encoder, and assistant input keys whose signals are directly transmitted to a microcomputer so that it can realize various functions by using limited input keys. CONSTITUTION: The system comprises a plurality of input keys(10), an encoder(30), at least one assistant input key(20), an interrupt generator(40) and a controller(50). The encoder(30) receives signals from the key input devices(10), encodes the key input signals, and outputs the encoded signal. The assistant input key(20) generates key input signals directly input to the controller(50). The controller(50) combines the encoded signals from the encoder(30) with the key input signal from the assistant input key(20) in a case that both the input key(10) and the assistant input key(20) are simultaneously selected, and performs a corresponding control operation. The interrupt generator(40) generates an interrupt signal in a case that a signal is input from either the input keys(10) or the assistant input key(20).

Description

Key input system {INPUT KEY SYSTEM}

The present invention relates to a key input system, and more particularly, to a key input system to perform a variety of functions using a limited number of input keys.

A widely used method of processing a user's key input is a general purpose input output (GPIO) method. The GPIO method is a method of processing a key input by sensing a high / low state of an input signal by applying a signal through a GPIO pin provided in a CPU or an I / O controller (Super I / O). .

The GPIO type key input system has a circuit as shown in FIG. The conventional key input system as shown in FIG. 4 includes an input key unit 110 for user selection, an encoder 130 for encoding a signal according to the type of input key selected from the input key unit 110, and an encoder ( An interrupt generator 140 generates an interrupt signal when the signal is output from the controller 130, and a controller 150 that receives the coded signal from the encoder 130 and performs control corresponding thereto when the interrupt signal is generated. . Here, the interrupt generator 140 receives a signal generated from the encoder 130 and a signal controller for transmitting the signal generated from the signal generator 142 and the signal generator 142 to the controller 150. 144. In addition, the controller 150 controls the key input signal coded by the encoder 130 and receives the I / O controller 152 and the interrupt signal transmitted from the I / O controller 152 when the interrupt signal is received. The microcomputer 154 performs control corresponding to the signal.

The input key unit 110 includes a plurality of input keys (SW1, SW2 ... SW7) for selecting a desired function by the user. When the user selects an input key, a key input signal is transmitted to the encoder 130. The encoder 130 generates a coded signal corresponding to the selected input key. Since the key input system illustrated in FIG. 4 has seven input keys, three output ports are required to encode each input key into a different signal using high / low (2 ³ = 8). The signals coded by the encoder 130 are transferred to the signal generator 142 of the interrupt generator 140 and the I / O controller 152 of the controller 150, respectively.

The encoded signal output according to the selected input key and applied to the GPIO may be represented as shown in Table 1 below.

<Table 1>

As illustrated in Table 1, the coded key input signal is transmitted to the signal generator 142, and the signal generator 142 generates an interrupt signal when the key input signal is input, through the signal controller 144. The interrupt signal is applied to the microcomputer 154 of the controller 150. Also, the key input signal output from the encoder 130 is applied to the microcomputer 154 through the GPIO pin of the I / O controller 152 of the controller 150. When an interrupt signal is applied to the microcomputer 154, the microcomputer 154 executes a key processing routine to perform control according to the selected key input signal.

In using such a key input system, when two or more input keys are selected at the same time, the encoder 130 codes and outputs only the selected key input signals according to a preset priority. Therefore, the user can select only functions as many as the number of input keys provided in the key input unit.

However, as electronic products having various functions have been produced in recent years, the number of input keys for selecting a function by a user has also increased. However, it is difficult to provide all the input keys necessary for the limited space of the product exterior.

Accordingly, an object of the present invention is to provide a key input system that can implement various functions using a limited number of input keys.

1 is a control block diagram of a key input system according to the present invention;

FIG. 2 is a detailed circuit diagram of the key input system of FIG. 1;

3 is a control flowchart of a key input system according to the present invention;

4 is a detailed circuit diagram of a conventional key input system.

* Explanation of symbols for the main parts of the drawings

10: input key unit 20: auxiliary input key unit

30: encoder 40: interrupt generator

42: signal generator 44: signal controller

50 control unit 52 I / O control unit

54: micom

The object is to generate a key input signal which is not input to the encoder in a key input system having a plurality of input keys and an encoder for encoding and outputting key input signals from the input keys, respectively, according to the present invention. At least one auxiliary input key; If the input key and the auxiliary input key is selected at the same time, and includes a microcomputer for performing control corresponding to the combination of the key input signal coded and output from the encoder and the key input signal output from the auxiliary input key It is achieved by a key input system characterized by.

It is preferable to increase the system efficiency by including an interrupt generator for outputting an interrupt signal when a signal is input from any one of the input key and the auxiliary input key.

When only the input key is selected alone, the micom executes control according to the single key signal coded and output from the encoder, and when only the combination key is selected, the micom is connected to the combination key signal. It is possible to carry out the control according to it.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram of a key input system according to the present invention. As shown in the figure, a key input system according to the present invention includes an input key unit 10 for user selection, an encoder 30 for encoding a signal according to the type of input key selected from the input key unit 10, The interrupt generator 40 generates an interrupt signal when the output signal is generated by the encoder 30, and the controller 50 receives the coded signal from the encoder 30 and performs control corresponding thereto when the interrupt signal is generated. It is composed of

In addition, the key input system further includes an auxiliary input key unit 20 for generating a key input signal that is not input to the encoder 30. The key input signal generated from the auxiliary input key unit 20 is directly input to the I / O controller 52 without passing through the encoder 30, and the key input signal generated from the auxiliary input key unit 20 is also interrupted by the interrupt generator 40. In this case, the interrupt signal is generated even when the auxiliary input key unit 20 is selected.

FIG. 2 is a detailed circuit diagram of the key input system of FIG. 1. As shown in the figure, the system includes a plurality of keys for selecting a desired function by the user, and the user input key is divided into an input key unit 10 and an auxiliary input key unit 20.

The key input signals generated from the plurality of input keys SW1, SW2... SW6 of the input key unit 10 are transmitted to the encoder 30, and the encoder 30 receives a fixed key input signal corresponding to the selected input key. Generate. In the present embodiment, six input keys are illustrated, and the key input signals coded by the encoder 30 are transferred to the interrupt generator 40 and the controller 50, respectively.

On the other hand, the key input signal generated from the auxiliary input key unit 20 is directly applied to the controller 50 without passing through the encoder 30, and the key input signal is also applied to the interrupt generator 40. In the present exemplary embodiment, one auxiliary input key SW7 is illustrated. The auxiliary input key SW7 normally maintains a high state and generates a low signal when it is selected and pressed.

The interrupt generator 40 receives the coded key input signal applied from the encoder 30 and the key input signal input from the auxiliary input key 20 to generate an interrupt signal and a signal generator 42 generating an interrupt signal. It is composed of a signal control unit 44 for transmitting to the control unit 50.

In addition, the controller 50 controls the key input signal coded by the encoder 30 and receives the interrupt signal from the I / O controller 52 that transmits the microcomputer 54 to the microcomputer 54. The microcomputer 54 further performs a control corresponding to the received signal.

Here, the encoder 30 encodes and outputs a signal corresponding to the selected input key, and has three output ports for encoding different signals corresponding to six input keys by using hi / lo (2 ³ = 8). The signal encoded by the encoder 30 is transferred to the signal generator 42 of the interrupt generator 40 and the I / O controller 52 of the controller 50, respectively. In addition, the encoder 30 of the present system has a preset priority according to each input key. When two or more input keys are selected at the same time, only the selected key input signal is coded and output according to the preset priority. The key is considered to be unselected. In this embodiment, the priority of the sixth input key SW6 is set highest and the priority of the first input key SW1 is set lowest. Therefore, when the second input key SW2 and the fourth input key SW4 are selected at the same time, only the signal of the fourth input key SW4 having high priority is encoded and output.

The signal generator 42 of the interrupt generator 40 generates an interrupt signal when a key input signal is applied from the encoder 30 and the auxiliary input key 20 to generate an interrupt signal from the controller 50 through the signal controller 44. The interrupt signal is applied to the microcomputer 54. Therefore, when either the auxiliary input key or the input key is selected, an interrupt signal is generated, and the interrupt signal is applied to the controller 50 under the control of the signal controller 44. The controller 50 of the system illustrated in the present description is a low active interrupt, and thus the signal generator 42 uses an AND gate.

Meanwhile, the I / O control unit 52 of the control unit 50 receives a key input signal of an input key coded by the encoder 30 and applied from three pins, and a key input signal applied from an auxiliary input key. It has three GPIO pins. That is, GPIO0, GPIO1, and GPIO2 are for receiving the output of the encoder 30, and GPIO3 are for receiving the signal of the auxiliary input key SW7. Accordingly, the microcomputer 54 combines the encoded key input signal of the input key unit 10 and the key input signal of the auxiliary input key unit 20 applied through the I / 0 control unit to perform the corresponding control.

The key input system illustrated as described above operates as the flowchart shown in FIG. When the user selects the input key unit 10 and the auxiliary input key unit 20 at the same time, the key input signal of the input key selected by the input key unit 10 is coded by the encoder 30 and transmitted to the I / O controller 52. The key input signal of the auxiliary input key selected by the auxiliary input key unit 20 is directly transmitted to the I / O controller 52. A signal according to the combined signal is executed by combining the signal of the input key and the signal of the auxiliary input key received by the microcomputer 54 through the I / O control unit 52.

Here, a combination of a signal encoded and output according to the input key selected by the input key section 10, a signal output according to the key selected by the auxiliary input key section 20, and these signals of the input key and the auxiliary input key are as follows. Same as the illustrated table.

TABLE 2

As shown in Table 2, since the auxiliary input key SW7 is directly transmitted to the control unit 50, even if selected simultaneously with the input key, the key input priority set in the encoder 30 is not affected. Therefore, when the auxiliary input key and the input key are selected at the same time, a signal combining two kinds of key input signals may be generated to implement more functions. For example, as in the present embodiment, 13 functions may be implemented by combining one auxiliary input key with six input keys.

Of course, it is possible to perform a function even if only the auxiliary input key is selected alone, it may be provided with two or more auxiliary input keys.

As described above, an input key transmitted to the microcomputer 54 after the key input signal is coded and an auxiliary input key to which the key input signal is directly input to the microcomputer 54, are controlled according to two types of key input signal combinations. By performing the above, various functions can be performed using a limited number of input keys.

As described above, according to the present invention, a key input system that can be utilized to perform various functions using a limited number of input keys is provided.

Claims (4)

A key input system having a plurality of input keys and an encoder for encoding and outputting key input signals from the input keys, respectively, At least one auxiliary input key for generating a key input signal not input to the encoder; And a control unit configured to execute control corresponding to a combination of the key input signal coded and output from the encoder and the key input signal output from the auxiliary input key when the input key and the auxiliary input key are simultaneously selected. Key input system characterized by. The method of claim 1, And an interrupt generator for outputting an interrupt signal when a signal is input from any one of the input key and the auxiliary input key. The method of claim 1, And if only the input key is selected alone, the micom performs control according to the single key signal coded and output from the encoder. The method of claim 1, And if only the auxiliary input key is selected alone, the microcomputer performs control according to the auxiliary input key signal.