JPH09198169A - Key input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability of the key switches by performing the operations corresponding to the key switches by the operation signals sent to the general-purpose input terminals from the key switches and then canceling a low power consumption mode by the gate output signal sent to an exclusive input terminal from a gate circuit via a microcomputer. SOLUTION: When the specific key switches 2 to 5 are operated when a low power consumption mode is set, the operations corresponding to the switches 2 to 5 are carried out by the operation signals which are sent to the general-purpose input terminals I1 to I4 . At the same time, the low power consumption mode is canceled by the gate output signal that is sent to an exclusive input terminal Iϕfrom an AND gate 6. Therefore, the operations corresponding to the switches 2 to 5 and the cancel of the low power consumption mode can be carried out at a time just by operating once the switches 2 to 5 respectively. As a result, the operability is improved for the switches 2 to 5 when the low power consumption mode is canceled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key input device for canceling a low power consumption mode based on operation signals from a plurality of key switches.

[0002]

Conventionally, this type of key input device has various electric equipments (for example, a battery-powered remote control device) provided with a low power consumption mode for suppressing power consumption.
Has been applied to This is because if the key switch is not operated for a predetermined time, the microcomputer sets the low power consumption mode, for example, the display of the display unit is darkened to reduce the power consumption, but if any key switch is operated thereafter, The microcomputer releases the low power consumption mode and makes the display of the display means bright again.

However, in such a key input device, even if a specific key switch is operated while the low power consumption mode is set, the microcomputer simply releases the low power consumption mode, It was not possible to perform the specific operation corresponding to the switch. Therefore, in order to perform the operation corresponding to the key switch, it is necessary to operate the key at least twice, and there is a problem that the operability is poor. In addition, the microcomputer in this case is provided with a plurality of dedicated input terminals for setting and canceling the low power consumption mode, corresponding to each key switch,
Alternatively, it is necessary to use a customized one for each application, and there is a problem that a general-purpose and inexpensive microcomputer cannot be used.

Therefore, in view of the above problems, it is an object of the present invention to provide a key input device which can improve the operability when the low power consumption mode is released and can use a highly versatile microcomputer.

[0005]

SUMMARY OF THE INVENTION A key input device of the present invention is a micro switch having a plurality of key switches and a single dedicated input terminal and a plurality of general-purpose input terminals connected to each of the plurality of key switches. A microcomputer, and a gate circuit that outputs a logical sum or a logical product of the operation signals from the plurality of key switches to the dedicated input terminal, the microcomputer is an operation signal from the key switch to the general-purpose input terminal With this, the operation corresponding to the key switch is performed, and the low power consumption mode is released by the gate output signal from the gate circuit to the dedicated input terminal.

In this case, when a specific key switch is operated when the low power consumption mode is set, the operation corresponding to the key switch is performed by the operation signal from the key switch to the general-purpose input terminal, and the gate circuit is used for the exclusive input terminal. The low power consumption mode is released by the gate output signal to the. Therefore, by operating a specific key switch only once, the operation corresponding to this key switch and the low power consumption mode are released at one time, and the operability of the key switch when releasing the low power consumption mode is improved. You can Even if a single dedicated input terminal is provided, a gate circuit is provided, and when any one of the key switches is operated, a gate output signal is supplied to the dedicated input terminal to reduce power consumption. Since the mode can be canceled, restrictions on the use of the microcomputer are reduced.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention applied to a remote control device.
First, in FIG. 1 showing a circuit configuration, reference numeral 1 is a microcomputer having a well-known control arithmetic device, a storage device, an input / output device, a time measuring device, etc. built therein. and _phi, a plurality of general-purpose input terminal I, each of which is connected to one end of each key switch 2-5
_{1 to} I ₄ are provided. Separately from this, the microcomputer 1 is provided with an operation terminal VDD to which a predetermined operation voltage + VDD is supplied and a ground terminal V connected to the ground.
Each SS is provided. A resistor 11 for current limitation is connected between the operating voltage + VDD line and the dedicated input terminal I _φ, and the operating voltage + VDD line and the general-purpose input terminal I ₁ to
Resistors 12 to 15 for current limiting are also connected to I ₄ , respectively. Further, the other ends of the key switches 2 to 5 are commonly grounded, and in the off state where the key switches 2 to 5 are not operated, the operating voltage + VDD is directly applied to the general-purpose input terminals I _{1 to} I _4, and Although the input terminals I _{1 to} I ₄ are at the H level, when the key switches 2 to 5 are operated, the general-purpose input terminals I _{1 to} I ₄ are grounded by the key switches 2 to 5 and the general-purpose input terminals I ₁ to I ₄ I ₄ becomes L level. That is,
In the circuit shown in FIG. 1, when a specific key switch 2 to 5 is turned on, an L level operation signal is output from the operated key switch 2 to 5 to the general-purpose input terminals I _{1 to} I ₄ . The microcomputer 1 is equipped with operation control means for performing an operation corresponding to each of the key switches 2 to 5 in response to an operation signal from the particular key switch 2 to 5 to the general-purpose input terminals I _{1 to} I ₄ , In addition, the display mode of the display means (not shown) is switched, or a specific control signal is output from the transmitter element of the remote controller.

An AND gate 6 outputs the logical sum of the operation signals from the key switches 2 to 5 to the dedicated input terminal I _φ . Each input terminal of the AND gate 6 is connected to one end of each of the key switches 2 to 5, and the output terminal of the AND gate 6 is connected to the dedicated input terminal I _φ . Therefore, when all the key switches 2 to 5 are not operated and all are in the off state, the dedicated input terminal I _φ has a resistance.
The operating voltage + VDD is applied as it is via 11, and the dedicated input terminal _Iφ becomes H level. When the dedicated input terminal _I.phi. Continues to be at the H level for a predetermined time without operating any of the key switches 2 to 5, the microcomputer 1 sets the low power consumption mode, for example, makes the display of the display unit dark. .

On the other hand, when any of the key switches 2 to 5 is turned on, one end of the operated key switch 2 to 5 is switched from the H level until then to the L level, so that the output terminal and the dedicated input terminal of the AND gate 6 are connected. I _φ also switches from the H level to the L level. That is, an L level gate output signal is output from the output terminal of the AND gate 6 to the dedicated input terminal I _φ . Microcomputer 1
Has a low power consumption mode canceling means for canceling the low power consumption mode when a gate output signal is output to the dedicated input terminal _Iφ in the low power consumption mode setting.

The AND gate 6 shown in FIG. 1 corresponds to the gate circuit in the present invention, but instead of this, an AND gate in which the diodes 6a to 6d shown in FIG. 2 are combined.
A circuit may be used. In this case, each diode 6a-6
If the cathode of d is connected to one end of the corresponding key switch 2 to 5 and the anode of each diode 6a to 6d is connected to the dedicated input terminal I _φ , the specific key switch 2 to 5 is connected as in FIG. When turned on, the diode 6a
A gate output signal of L level can be output from the anode of ~ 6d to the dedicated input terminal I _φ .

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. Since the AND gate 6 in FIG. 1 and the diodes 6a to 6d in FIG. 2 are completely equivalent in circuit, the following description will be given based on FIG.

When a predetermined time elapses after operating the key switches 2 to 5, the microcomputer 1 shifts to a low power consumption mode according to a control sequence of a program built in the storage device (step S1). The microcomputer 1 waits for the release input of the low power consumption mode in the next step S2. If, for example, the key switch 2 is operated, the general-purpose input terminal I ₁ corresponding to the key switch 2 is switched to the L level, and at the same time, the AN
The dedicated input terminal I _φ is also switched to the L level by the D gate 6. Therefore, in step S3, the microcomputer 1 releases the low power consumption mode and
In the next step S4, it is determined that the general-purpose input terminal I ₁ is at L level, and the operation corresponding to the key switch 2 is performed (step S5). When the key switch 3 is operated in step S2, the microcomputer 1 releases the low power consumption mode in the next step S3. At this time, the general-purpose input terminal I ₂ corresponding to the key switch 3 is also at the L level. , The microcomputer 1 determines that the general-purpose input terminal I ₂ is at L level and performs the operation corresponding to the key switch 3 (step S7). The step S
When the key switch 4 is operated by pressing 2, the microcomputer 1 releases the low power consumption mode in the next step S3, but at the same time, the general-purpose input terminal I ₃ corresponding to the key switch 4 is switched to the L level. , And proceeds to step S8, where the microcomputer 1 receives the general-purpose input terminal I ₃
Is determined to be the L level and the operation corresponding to the key switch 4 is performed (step S9). Further, when the key switch 5 is operated in the step S2, the microcomputer 1 releases the low power consumption mode in the next step S3, but at the same time, the general-purpose input terminal I ₄ corresponding to the key switch 5 is also at the L level. Switch to step S.
Then, the operation corresponding to the key switch 5 is performed. That is, according to each of the steps S3 to S10, by operating the key switches 2 to 5 once, the low power consumption mode is canceled and the operations corresponding to the key switches 2 to 5 are performed at once.

After that, in step S11, before the microcomputer 1 sets the low power consumption mode,
If the specific key switches 2 to 5 are operated again, the procedure returns to step S4 and thereafter, and the operated key switches 2 to 5 are returned.
The operation corresponding to 5 is performed. On the contrary, if none of the key switches 2 to 5 is operated within the predetermined time, step S1
Returning to the procedure thereafter, the microcomputer 1 sets the low power consumption mode.

As described above, according to the above embodiment, when the specific key switches 2 to 5 are operated when the low power consumption mode is set, the general purpose input terminals I _{1 to} I _{4 are} output from the key switches 2 to 5.
The operation signal corresponding to the specific key switches 2 to 5 performs the operation, and the gate output signal from the AND gate 6 to the dedicated input terminal I _φ releases the low power consumption mode. Therefore, by operating the specific key switches 2-5 once, the key switches 2-5
Since the operation corresponding to 5 and the release of the low power consumption mode are performed at the same time, the operability of the key switches 2 to 5 when releasing the low power consumption mode can be improved. Also,
Dedicated input terminal I _φ provided in the microcomputer 1
Even if only one is provided, only by providing the AND gate 6 which is a gate circuit, when any one of the key switches 2 to 5 is operated, a gate output signal is supplied to the dedicated input terminal I _φ , The low power consumption mode can be released. Therefore, restrictions on the use of the microcomputer 1 are reduced, and the inexpensive and versatile microcomputer 1 can be used.

That is, the plurality of key switches 2 to 5 are respectively connected to the plurality of general-purpose input terminals I _{1 to} I ₄ of the microcomputer 1, while the AND gate 6 is used to operate the operation signals from the plurality of key switches 2 to 5. _Is output to a single dedicated input terminal Iφ of the microcomputer 1, and operation signals corresponding to the key switches 2 to 5 are generated by operating signals from the key switches 2 to 5 to the general-purpose input terminals I _{1 to} I ₄ . And the microcomputer 1 is configured to release the low power consumption mode by the gate output signal from the AND gate 6 to the dedicated input terminal I _φ , the operability in releasing the low power consumption mode is improved. Moreover, it becomes possible to use the microcomputer 1 having high versatility.

Next, a second embodiment of the present invention will be described with reference to the circuit diagram of FIG. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description of the common parts will be omitted. In this embodiment, the input logic of the dedicated input terminal I _φ and the general-purpose input terminals I _{1 to} I ₄ is opposite to that of the first embodiment. Specifically, a plurality of key switches 2 to 5 are used as a gate circuit. Using the OR gate 7 which outputs the logical product of the respective operation signals of 1 to the dedicated input terminal I _φ ,
Connect the other end of 5 to the operating voltage + VDD line, while connecting the resistor
It has the same structure as that of FIG. 1 or 2 except that the other ends of 11 to 15 are commonly grounded.

In this case, the general-purpose input terminals I _{1 to} I ₄ are at the L level when the key switches 2 to 5 are not operated, but the operating voltage + VDD is the key when the key switches 2 to 5 are operated. is applied to the general-purpose input terminal I ₁ ~I ₄ via the switch 2-5, the general-purpose input terminal I ₁ ~I ₄ becomes H level. That is, when the specific key switches 2 to 5 are turned on, H level operation signals are output from the operated key switches 2 to 5 to the general-purpose input terminals I _{1 to} I ₄ .

When any of the key switches 2 to 5 is turned on, one end of the operated key switch 2 to 5 is switched from the L level to the H level, so that the output terminal and the dedicated input terminal of the OR gate 7 are connected. I _{φ is} also from L level to H
Switch to level. That is, an H level gate output signal is output from the output terminal of the OR gate 7 to the dedicated input terminal I _φ .

Also in this embodiment, when the specific key switches 2 to 5 are operated when the low power consumption mode is set, the specific keys are operated by the operation signals from the key switches 2 to 5 to the general-purpose input terminals I _{1 to} I ₄ . The operations corresponding to the switches 2 to 5 are performed, and the exclusive input terminal I is supplied from the OR gate 7.
The gate output signal to _φ cancels the low power consumption mode. Even if the microcomputer 1 has a single dedicated input terminal I _φ , only the OR gate 7 which is a gate circuit is provided, and the key switches 2 to 5 are provided.
When any one of them is operated, a gate output signal can be supplied to the dedicated input terminal _Iφ to cancel the low power consumption mode. Therefore, it becomes possible to improve the operability when the low power consumption mode is released and use the microcomputer 1 having high versatility.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the key input device of the present invention is not limited to a remote controller, but can be widely applied to various electric devices including a mobile device, a backup device, and the like. Further, the number and types of key switches are not particularly limited.

[0021]

The key input device of the present invention comprises a plurality of key switches, a microcomputer having a single dedicated input terminal and a plurality of general-purpose input terminals connected to each of the plurality of key switches, and A gate circuit for outputting a logical sum or a logical product of respective operation signals from a plurality of key switches to the dedicated input terminal, wherein the microcomputer switches the key switches according to an operation signal from the key switch to the general-purpose input terminal. Is configured to release the low power consumption mode by the gate output signal from the gate circuit to the dedicated input terminal in addition to performing the operation corresponding to, and enhance the operability when the low power consumption mode is released, In addition, it becomes possible to use a highly versatile microcomputer.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a modification of the first embodiment.

FIG. 3 is a flowchart showing a processing procedure of a microcomputer.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention.

[Explanation of symbols]

1 Microcomputer 2 to 5 Key switch 6 AND gate (gate circuit) 6a to 6d Diode (gate circuit) 7 OR gate (gate circuit) I _{1 to} I ₄ General-purpose input terminal I _φ dedicated input terminal

Claims (1)

[Claims] 1. A microcomputer comprising a plurality of key switches, a single dedicated input terminal, and a plurality of general-purpose input terminals connected to each of the plurality of key switches,
A gate circuit that outputs a logical sum or a logical product of the operation signals from the plurality of key switches to the dedicated input terminal, and the microcomputer is configured to operate the key according to an operation signal from the key switch to the general-purpose input terminal. A key input device configured to perform an operation corresponding to a switch and to release a low power consumption mode by a gate output signal from the gate circuit to the dedicated input terminal.