JPS63263516A - Information input device - Google Patents

Abstract

PURPOSE:To eliminate the need of a software for serial data processing by supplying a key scan signal to a key matrix part in case of a trigger signal in the inverse state and stopping the output of the key scan signal in case of the trigger signal in the other states and decoding external data by a decod ing part. CONSTITUTION:When the trigger signal from an input terminal 15 is in the high level, a key scan signal supply means 12 stops the output of key scan signals KS1-KS4 by the control signal from a control signal generating means 16. Then, a selector 141 selects the data decoder side in a decoding part 14. Consequently, key operation is not accepted though it is performed in a key matrix part 11. At this time, external data given to external data input terminals 131-134 are decoded as four-bit data by a data decoder 143. This decoded output is processed by a data processing means 17 and a prescribed control signal is outputted from the data processing means 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information input device suitable as an input circuit for a micro combinator (hereinafter referred to as a microcomputer) or the like.

[Summary of the invention]

This invention provides an information input device that uses a key matrix without significantly increasing the number of information input terminals.
Moreover, it is possible to efficiently accept inputs from the outside in a number greater than the number of keys in the key matrix without complicating the software for decoding processing.

[Conventional technology]

Conventionally, key matrices have been used in microcomputers and the like to obtain a large amount of input information with a small number of input ports.

Figure 5 shows an example of an input device using this key matrix, where (1) is a microcomputer * S1 + S2 *
S3 and S4 are the output ports of this microcomputer (1), and the 61st! As shown in FIG. 1, key scan signals KS1 to KS4 having the same repetition period and sequentially different phases are output. INL to IN4 are input ports of this microcomputer 11).

(2) is a key matrix, which in this example has 4x4-16 keys with numbers 11 to 44.

1 Microcomputer (1) output capo) SINS4
The key scan signals KSs to KS4 from the key matrix (2) are transmitted through backflow prevention diodes D1 to D4.
input terminals. Four output ends of key matrix (2) are connected to input ports IN1 to IN4.

When, for example, the key KIL is pressed in this input device, a pulse is input to the input port INt at the timing of the key scan signal KS1, and it is detected that K1> has been pressed.

That is, the position of the input port where the pulse appears and which key was operated at the timing of the appearance of the pulse are detected. In this case, 16 types of input can be given.

By the way, in order to be able to accept even more input information in this type of information input device, it is sufficient to increase the number of keys in the key matrix (2). If you want to get 32 inputs, you can use 4x8 and increase the number of output ports by 41, or increase the number of input ports by 4.However, increasing the number of ports used should be done by using as few ports as possible. This defeats the purpose of this type of input device, which is to obtain a large number of information inputs.

Therefore, conventionally, in addition to inputting information using the key matrix (2), external data is inputted as serial and serial data to the microcomputer (1). In Figure 5, S
IN is the serial data input port of the microcomputer (1).1 For example, when realizing a remote control function, it is necessary to input the same number of types of input data as the number of keys in the key matrix (2). If the number is 16, then 4
Input terminal (3) for bit data as serial data
It is designed to supply the input signal to SIN.

[Problem that the invention seeks to solve]

However, in this method of inputting serial data, it is necessary to input this serial data in units of a predetermined focus (14 bits in the above example) and process the serial data. The drawbacks were that the burden on the software increased and the program capacity increased.

The present invention aims to realize an information input device that does not have such drawbacks.

[Means for solving problems]

FIG. 1 shows an example of the present invention, and the blocks other than the key matrix section become blocks indicating the functions when realized by a microcomputer.

That is, in FIG. 1, (11) is a key matrix section, which in this example has 4.times.4-16 keys.

(12) is a key scan signal supply means which, like the conventional example shown in FIG.
1 to KS4 are supplied to the key matrix section (11) via backflow prevention diodes D1 to D4.

(13x) to (134,) are external data input terminals,
The output terminals of the key matrix section (11) are connected to each other via backflow prevention diodes Ds''Ds.

(14) is a decoding section, and this external data input terminal (
131) to (134) and the diodes Ds to Ds are connected to the input end of this decoding section (14).

In this example, this decoding section (14) is a selector (1
41), a key matrix decoder (142), and a data decoder (143).

The key matrix decoder (142) is supplied with a key scan timing determination signal from the key scan signal supply means (12).

(15) is the input terminal for the trigger signal, and this input terminal (1
The trigger signal through 5) is supplied to the control signal generating means (16).

Then, the control signal is sent from the control signal generating means (16) to the decoding section (14) and the key scan signal supplying means (
12).

(17) is a processing means for decoded data.

[Effect]

When the trigger signal from the input terminal (15) is, for example, at a low level, the key matrix section ( 11) are supplied with key scan signals K S 1 to KS4. Also,
In the decoding section (14), the selector (141) is in a state of selecting the key matrix decoder (142) side. Therefore, when any key is operated in the key matrix section (11), the key matrix decoder (142) of the decoding section (14) decodes which key was operated, and the decoded output is sent to the data processing means (17). The data processing means (17) outputs a processed signal that performs a predetermined control.

Next, when the trigger signal from the input terminal (15) is Halbel, the key scan signal supply means (12) generates the key scan signal K S t to K S by the control signal from the control signal generation means (16). 4 is stopped.Then, in the decoding section (14), the selector (141) becomes in a state of selecting the data decoder side.Therefore,
Even if a key operation is performed in the key matrix section (11), this will not be accepted, and at this time, the external data given to the external data input terminals (13i) to (134) is 4.
The data is decoded as bit data by a data decoder (143). The decoded output is the data processing means (17
), and a signal for predetermined control is output from this data processing means (17).

〔Example〕

FIG. 2 shows the configuration of an embodiment in which the present invention is applied to a microcomputer input circuit, and the same parts as in the conventional example shown in FIG. 5 are given the same reference numerals, and their explanation will be omitted.

That is, in this example, 4 of key matrix (2)
The output terminals each have diodes D5 to D for backflow prevention.
8 to the input ports lNz to IN4 of the microcomputer (1)
connected to.

Further, (4) is a remote control signal receiving section, and the remote control signal received by this receiving section is supplied to a remote control decoder (5). This decoder (5) decodes the input remote control signal into 4-bit parallel data. The 4-bit data from the decoder (5) is supplied to the input ports (INt to IN4) of the microcomputer (1) via backflow prevention diodes Ds=Dtz, respectively. Furthermore, when the remote control signal received from the receiver (4) is supplied to the decoder (5), a trigger signal TO that changes from low level to high level as shown in FIG. 3 is output from the decoder (5). This trigger signal TG is sent to the microcomputer (1
) is supplied to input port T of

FIG. 4 shows an example of a flowchart of an information input operation executed by the microcomputer (1), and the information input operation will be explained below with reference to this flowchart.

That is, the microcomputer (l) determines the state of the trigger signal TG input to the boat T (step (101)).
, when the trigger signal TG is at a low level, there is no input of the remote control signal. At this time, the key scan signals KS1 to KS4 are output from the output ports 81 to S4 (step (102)), and the input port lNz~IN4
It is determined from the state whether the key has been manually operated (step (103)'), and if there is no key, the process returns to step (101), and if there is key, the key is input (step (103)').
Key matrix decoding is performed to determine which key was operated according to the timing of the key scan signal appearing on Nz to IN4 (step (104)), and the decoded output data is processed (step (105)), and the key matrix decoded according to the input key operation is performed (step (104)). System operations are performed.

When it is determined in step (101) that the trigger signal TG is at a high level, the remote control signal is being input. At this time, all output ports 81 to S4 are held at low level (step (10B)).

That is, the output of key scan signals KSz to KS4 is stopped. Then, the 4-bit data supplied to the input ports INz to IN4 is decoded (step (10)).
7) ), the decoded data is processed (
In step (105), the system operates according to the input 4-bit data.

As described above, in this example, in addition to the 16 types of information based on key matrix (2), 16 types of information based on 4-bit input data can be input.

In addition, the backflow prevention diode D! -D12 can be omitted by making the output terminal of the decoder (5) high impedance when not outputting data.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to receive external inputs of the same number as the number of keys in the key matrix using the input port for the key matrix without converting them into serial data inputs. . Since the external data is not serial data input, the present invention does not require software for processing this serial data.

In addition, a large number of input ports are required to accept external input as parallel data, but in this invention, the input ports are also used for key input, so only one expansion board is needed for trigger signal input. There is an advantage.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an example for explaining the invention in detail, FIG. 2 is a diagram showing the configuration of an example of the invention, FIG. 3 is a timing chart for explaining the invention, and FIG. 4 is a functional block diagram of the invention. FIG. 5 is a flowchart for explaining the operation, FIG. 5 is a diagram showing an example of a conventional device, and FIG. 6 is a diagram for explaining the same. (1) is a microcontroller, (2) is a key matrix, (4) is a remote control receiver (mu), (5) is a remote control decoder, 81 to
S4 is an output port that outputs a key scan signal, IN1
~IN4 is an input port, and T is an input port for inputting a trigger signal.

Claims (1)

[Claims] A key matrix section having n×m (n and m are natural numbers) keys, and a key scan signal is supplied to each of the n input terminals of this key matrix section via a backflow prevention diode. m of the key matrix section;
an external data input terminal to which each output terminal is connected via a backflow prevention diode, a decoding section to which a connection point between the external data input terminal and the backflow prevention diode is connected, and a trigger signal. and a control signal generating means to which the control signal generating means supplies a control signal to the key scan signal supply means and the decoding section, and when the trigger signal is in one state, the key scan signal is inputted. The key scan signal is supplied from the supply means to the key matrix unit, and the decode unit detects the position of the operated key in relation to the key scan signal and obtains a decode output corresponding to the position of the operated key, and the trigger signal is in any other state, the output of the key scan signal from the key scan signal supply means is stopped, and the external data supplied to the external data input terminal is decoded by the decoding section, and the output is performed according to the external data. An information input device that can provide decoded output.