JPS6153727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a key signal input method for inputting signals from a numeric keypad and control keys to a microcomputer.

A digital audio disk player is a device that processes signals from a numeric keypad and control keys using a microcomputer and performs various controls in accordance with the processing results. This digital audio disc player is
Various information such as audio signals, synchronization signals, track number signals, auxiliary track number signals, total running time signals, remaining time signals, and inter-track signals are digitized and optically recorded at high density at a constant linear velocity. By reading the information on the disk and demodulating it, a high-fidelity audio signal is reproduced. In this case, in the digital audio disc player, various modes are controlled using the various information recorded on the disc. That is, a key unit is provided on the operation panel portion of the digital audio disc player. This key unit is composed of ten keys "1" to "0" and control keys, and the control keys include hyphen, memory, search, repeat, and clear keys. Therefore, for example, you can specify the playback song number using multiple digits using the numeric keypad, specify the auxiliary song number using the hyphen key and the numeric keypad, store input information using the memory key, search for information using the search key, repeat control using the repeat key,
Input information and recorded information are erased using the clear key.

In this case, since the key unit has a numeric keypad and control keys, which have different characteristics,
Conventional key input circuits use extremely complicated methods such as inputting the output signals of the numeric keypad and control keys into the microcomputer through separate key input circuits. However, there are problems such as a key output signal that is not available is erroneously captured.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a key signal input method for a microcomputer that can easily and reliably input numeric keypad output signals and control key output signals to the microcomputer. Hereinafter, a key signal input method for a microcomputer according to the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a key signal input method for a microcomputer according to the present invention. In the figure, 1 is a key unit, which has X lines 3a to 3d connected to the power supply +V via resistors 2a to 2d, and Y lines 5a to 5d connected to the power supply +V via resistors 4a to 4d. It has And this X line 3a~3d
At each intersection of the Y lines 5a to 5d, there are numeric keys 6a to 6a with keys ``1'' to ``0'' that ground the pair of X and Y lines located at the intersection during operation.
6j and hyphen, memory, search, repeat,
Control keys 6k to 6o consisting of clear keys are provided. 7 takes in the signals of each of the X lines 3a to 3d of the key unit 1 to the input ports Aa to Ad, and the signals of each of the Y lines 5a to 5d of the key unit 1 to the input ports.
It is an encoder that converts the key matrix output signal into a binary code output signal and outputs it from the output ports Ca to Cd by inputting it into the output ports Ba to Bd.
MC14419 is used. Then, this encoder 7 outputs from the output port D when an output signal is generated.
It is configured to generate a strobe pulse SP. A microcomputer 8 has data ports D ₀ to D ₇ , output ports P ₀ to _{P 2} for sending control signals, and an input port P ₃ for interrupt control. Reference numeral 9 denotes a NOR gate which receives each output signal generated from the output ports Ca to Cd of the encoder 7, and its output signal is supplied to the input port _P3 of the microcomputer 8 as an interrupt control signal. 10 is a three-state buffer circuit, and a microcomputer 8
The output signal of the encoder 7 is activated by the first load control signal _Q1 generated from the output port _P0 of the encoder 7, and the output signal of the encoder 7 is supplied to the microcomputer 8 via the lower four bit lines of the data bus DB. 11 inputs each output signal generated from the output ports Ca to Cd of the encoder 7 to the input ports Aa to Ad, and also inputs the strobe pulse SP generated from the output port D as a clock input.
This is the first latch circuit of the type, which transmits the latch signal to the microcomputer 8 via the lower four bit lines of the data bus DB in response to the second load control signal _Q2 generated from the output port _P1 of the microcomputer 8. supply 12 is a D-type second latch circuit which inputs each output signal of the encoder 7 to input ports Aa to Ad and also receives the strobe pulse SP as a clock input, and its output signal is sent to the lower 4 bit lines of the data bus DB. Each is supplied. 13 is the second latch circuit 1
It is a D-type third latch circuit which inputs each output signal of 2 to each input port Aa to Ad, and uses strobe pulse SP as a clock input CK, and outputs each output signal generated from each output port Ca to Cd. is supplied to the microphone computer via the upper 4 bit lines of the data bus DB. In addition,
The latch circuits 12 and 13 are connected to the microcomputer 8.
The latch signal is sent out by the third load control signal _Q3 generated from the output port P2 _of . The operation will be explained in detail below using the flowchart shown in FIG.

First, when you operate the numeric keypad 6a, for example, to specify a song number and play it, the X line 3a and Y line 5a become "L", and the encoder 7 takes in the output signal from the keyboard 1 and outputs it to the output terminal. Since a binary output of “1000” is output from Ca to Cd along with the strobe pulse SP,
This output signal is transmitted to the first and second latch circuits 11 and 12.
is latched to. When an output signal is generated from this encoder 7, the NOR gate 9 determines that there is a key input and supplies an interrupt control signal to the input port _P3 of the microcomputer 8, as shown in step _S1 in FIG. The microcomputer 8 is switched to the interrupt mode shown in step _S2 .
Then, the microcomputer 8 outputs the first load control signal from the output port _P0 as shown in step _S3 .
By generating _Q1 and activating the buffer circuit 10, the output signal of the encoder 7 is taken in via the buffer circuit 10 and the data bus DB. Then, in step _S4 , it is determined whether the data just taken in is a numeric keypad signal, and if it is a numeric keypad signal, the process proceeds to step _S5 .
to move to. In step _S5 , if this data is input from the numeric keypad, the previous data is determined. This is because if the previous data is based on a hyphen key, it indicates an auxiliary song number. However, in this case, since there is no data generated by the hyphen key operation before the data generated by the first numeric key operation, the process moves to step _S6 . In step _S6 , the microcomputer 8 outputs the third load control signal from the output port _Q3 .
In order to generate Q ₃ , the second and third latch circuits 1
Outputs are generated from 2 and 13. In other words, the second latch circuit 12 outputs the output signal "1000" of the encoder 7 which encodes the output signal of the first operation numeric keypad 6a, and the third latch circuit 13 outputs the data "0000". It will be output. Next, when the numeric keypad 6b is operated, steps _S1 to _S6 shown in FIG. 2 are executed by the same process as described above. In this case, when the strobe pulse SP is generated, the first and second latch circuits 11 and 12 will take in and latch the new output signal "0100" output from the encoder 7. Since the third latch circuit 13 is serially connected to the second latch circuit 12, it takes in and latches the output signal "1000" that was previously latched in the second latch circuit 12. Therefore, in this state, the first digit of the song number is latched in the second latch circuit 12, the second digit of the song number is latched in the third latch circuit 13, and the third digit is latched in the third latch circuit 13. The second and third latch circuits 12, which are output in response to the generation of the load control signal _Q3 ,
The output signal No. 13 is taken in via the data bus DB in step _S7 .

Next, if you want to specify an auxiliary song number that is determined to represent a movement within that song following the song number, use the numeric keypad to select the auxiliary song number after operating the hyphen key 6k in the control key group. Specify the number. Here, when the hyphen key 6k is operated, the microcomputer 8 processes steps _S1 to _S3 shown in FIG.
Move to _S4 . In step _S4 , the output signal of the encoder 7 is determined to be a signal other than the numeric keypad, that is, a control key signal, and the mode corresponding to the signal is controlled. Next, when the numeric keypad 6c, for example, is operated as a numeric keypad for specifying an auxiliary song number, the encoder 7 generates an output of "1100". Since the output signal of the encoder 7 is determined to be YES in step _S5 shown in FIG. 2, the second load control signal _Q2 is sent from the output port _P1 of the microcomputer 8 in step _S8 . is generated. When the second load signal _Q2 is generated, the latest encoder output latched in the first latch circuit 11, that is, "1100" is sent out, and this output information is sent to step _S9 via the data bus DB. As shown, it is determined to be an input signal for auxiliary track number search and is taken in. Therefore, in this state, "12-
This means that the information consisting of the song number ``12'' and the auxiliary song number ``3'' has been imported.

Next, when the search key 6m of the control key group is operated, it is determined as control key data in step _S4 shown in FIG.
Along with this, the search control shifts to the contents of the control data, that is, in this case, the key-input song number and auxiliary song number. That is, the output signal of the encoder 7 generated by the control key is taken in via the buffer circuit 10.

Therefore, when using this type of key input method, the microcomputer does not have to do all the key input processing, but rather performs some preprocessing before inputting keys, so the numeric keypad and control keys are used. can be handled all at once.

In the above embodiment, the case where the invention is applied to a digital audio disk player has been described, but the present invention is not limited to this, and the present invention can be applied to a microcomputer by mixed use of a numeric keypad and a control key. This applies to all cases where Therefore, the above-mentioned hyphen key can be replaced with another control key, and the above-mentioned song number and auxiliary song number are represented as an address signal and an auxiliary address signal.

As described above, according to the key input method for a microcomputer according to the present invention, mixed use of the numeric keypad and control keys can be easily and reliably performed. Further, according to the present invention, although the configuration is simple, the output data of the numeric keypad that is operated sequentially is recombined into multi-digit data and is supplied all at once as parallel data, so the burden on the key input processing on the microcomputer is reduced. It has various excellent effects such as reducing

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a key signal input method for a microcomputer according to the present invention, and FIG. 2 is a flowchart for explaining the operation of the circuit shown in FIG. 1...keyboard, 2a-2d, 4a-4d...resistance, 3a-3d...X line, 5a-5d...Y line, 6a-6k...numeric keypad, 6l-6o...control key, 7...encoder, 8...microcomputer, 9...NOR gate, 10...Buffer circuit, 11-13...First to third latch circuits.

Claims (1)

[Claims] 1. An encoder that encodes the output of a keyboard with a mixture of numeric keys and control keys,
By using a buffer circuit with a three-state configuration that receives the output of this encoder as input, and receiving interrupt control when the output of the encoder is generated,
A microcomputer that takes in the output of the buffer circuit via a data bus, and a microcomputer that takes in and holds the output of the encoder every time the output is generated, and outputs the latch output from a part of the data bus according to instructions from the microcomputer. The first and second latch circuits output to the bit line, and the output of the second latch circuit is captured and held when the encoder output is generated, and the second latch circuit is connected according to instructions from the microcomputer. and a third latch circuit that supplies an output signal to a hit line of the data bus, and the microcomputer is configured to actively control the buffer circuit in an interrupt mode when an output from the encoder is generated. Therefore, the output of this buffer circuit is taken in as a key signal, and if this taken-in key signal is a numeric keypad signal and the previous key signal is not a control key signal indicating an auxiliary address, it is sent to the second and third latch circuits. By supplying a control signal and generating an output, the numeric keypad signals are held sequentially and the output is taken in parallel as a multi-digit address signal via the data bus, and the key signal generated before the numeric keypad signal is used as an auxiliary key signal. In the case of a control signal indicating an address, the first latch circuit is controlled to generate a latch output, and the output of the first latch circuit is taken in as an auxiliary address via a data bus. Key signal input method for computers.