JP2002244878A - Electronic equipment and operation mode switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic equipment that can properly prevent an unintentional shift to a test mode. SOLUTION: In a power-on reset, a microcomputer 3 determines whether operation keys 2 depressed together with a reset switch 1 are given keys (a plurality of predetermined keys) or not. If finding the given keys depressed, the microcomputer 3 controls a timer 4 to start the counting of a prescribed time. The microcomputer 3 determines the validity of operation keys 2 depressed consecutively in the given time (whether a plurality of keys are depressed in predetermined order or not). If determining the validity of the operation keys 2, the microcomputer 3 switches the mode of operation to a test mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a test mode function for performing self-diagnosis and the like, and more particularly, to an electronic device and an operation mode switching device capable of appropriately preventing an unintended transition to a test mode. About the method.

[0002]

2. Description of the Related Art Conventionally, various electronic devices provided with microcomputers have been widely used for vehicles and homes. Such an electronic device generally has a test mode function for performing self-diagnosis, initial setting, and the like.
This test mode is provided for performing inspection, adjustment, and the like of an electronic device in a manufacturing process of a manufacturer. For example, a specific software stored in a nonvolatile memory is started (executed). It works by.

[0003] More specifically, in an electronic apparatus having a configuration (main part) as shown in FIG.
When the reset switch 101 is pressed (a reset signal is input to the microcomputer 103) in a state where a plurality of predetermined keys (two or three keys) are pressed, the mode shifts to the test mode. That is, the microcomputer 103 executes an operation mode switching process as shown in FIG. 4, and switches between the operation in the test mode and the normal operation. Hereinafter, the operation mode switching process will be described with reference to the flowchart of FIG. The operation mode switching process is started at the time of a power-on reset (such as at the time of inputting a reset signal).

First, the microcomputer 103 determines whether or not the reset switch 101 has been pressed (step S101). Microcomputer 103
If it is determined that the reset switch 101 has not been pressed, the process proceeds to step S104 described below. On the other hand, if the microcomputer 103 determines that the reset switch 101 has been pressed,
It is determined whether or not the predetermined key No. 02 is pressed (step S102). That is, the microcomputer 1
03 determines whether or not a plurality of predetermined keys (two or three keys) among the operation keys 102 are pressed.

[0005] When the microcomputer 103 determines that the predetermined key has been pressed, it starts operation in a test mode (step S103). On the other hand, when it is determined that the predetermined key has not been pressed (step S1).
When it is determined that the reset switch 101 has not been pressed at 01 (YES in step S104), the microcomputer 103 starts a normal operation (step S104). Such an operation mode switching process prevents the electronic device from erroneously shifting to the test mode due to a user operation after the sale.

[0006]

However, in an electronic device having a relatively small number of operation keys 102, such as an in-vehicle CD changer or an MD changer, the operation mode switching process (step S102). Since the number of predetermined keys to be determined is limited, there is a high possibility that the mode is erroneously shifted to the test mode by a user operation. If the electronic device is unintentionally shifted to the test mode, the user may misunderstand that the electronic device has failed due to a display different from the normal operation, or set the setting value or the like to an inappropriate value. Could be changed to

The present invention has been made in view of the above circumstances, and has as its object to provide an electronic device and an operation mode switching method capable of appropriately preventing an unintended transition to a test mode.

[0008]

In order to achieve the above object, an electronic device according to a first aspect of the present invention has a predetermined test mode function, and is provided with a reset switch and a plurality of operation keys. When the reset switch is pressed, it is determined whether or not a plurality of operation keys pressed together match a predetermined operation key. Before the time elapses, the validity of a plurality of operation keys that are subsequently pressed is determined, and when the validity of the operation keys is determined, the operation mode is switched to the test mode.

According to the present invention, when the reset switch is pressed, the electronic device determines whether or not a plurality of pressed operation keys coincide with predetermined operation keys. When it is determined that the operation keys match, before the predetermined time elapses, the validity of a plurality of operation keys that are subsequently pressed (for example, whether the plurality of operation keys are pressed in a predetermined order). Is determined. Then, the electronic device switches the operation mode to the test mode only when the validity of the operation key is determined. As described above, the determination of the operation keys is performed in two stages, and the time limit is provided. In the unconscious operation of the user, the operation mode shifts to the test mode, which is extremely practical. It becomes difficult. As a result, an unintended transition to the test mode can be appropriately prevented.

To achieve the above object, an electronic device according to a second aspect of the present invention has a predetermined test mode function and is provided with a reset switch and a plurality of operation keys. A first discriminating means for discriminating whether or not a plurality of operation keys pressed together coincide with a predetermined operation key when the first discriminating means is pressed; Is determined,
Timer means for starting time counting for a predetermined time; second determining means for determining the validity of a plurality of operation keys that are subsequently pressed before the time counting means finishes timing; and the second determining means. Mode switching means for switching the operation mode to the test mode when the validity of the operation key is determined;
It is characterized by having.

According to the present invention, when the reset switch is depressed, the first discriminating means determines whether or not a plurality of pressed operation keys coincide with a predetermined operation key. . The timer means starts measuring a predetermined time when the first determining means determines that the operation keys match. The second determination means is provided before the timing means finishes the timing.
Subsequently, the validity of the plurality of operation keys to be pressed (for example, whether or not the plurality of operation keys are pressed in a predetermined order) is determined. The mode switching unit switches the operation mode to the test mode only when the validity of the operation key is determined by the second determination unit. As described above, the determination of the operation keys is performed in two stages, and the time limit is provided. In the unconscious operation of the user, the operation mode shifts to the test mode, which is extremely practical. It becomes difficult. As a result, an unintended transition to the test mode can be appropriately prevented.

[0012] The second determination means may determine the validity of the operation keys when a plurality of operation keys are pressed in a predetermined order.

In order to achieve the above object, an operation mode switching method according to a third aspect of the present invention has an operation mode switching method for an electronic device having a predetermined test mode function and having a reset switch and a plurality of operation keys. A first determining step of determining, when a reset switch is pressed, whether or not a plurality of operation keys pressed together match a predetermined operation key; and When a match between the operation keys is determined in the determination step, a timing step for starting timing of a predetermined time, and before the timing is completed in the timing step, the validity of a plurality of operation keys pressed subsequently is determined. And a mode switching step of switching the operation mode to the test mode when the validity of the operation key is determined in the second determination step. And it features.

According to the present invention, in the first determining step, when the reset switch is pressed, it is determined whether or not a plurality of operation keys pressed together match predetermined operation keys. . In the timing step, when a match between the operation keys is determined in the first determination step, timing of a predetermined time is started. In the second determination step, before the timing is completed in the timing step, the validity of a plurality of operation keys that are subsequently pressed (for example, whether or not the plurality of operation keys are pressed in a predetermined order) is determined. Determine. The mode switching step switches the operation mode to the test mode when the validity of the operation key is determined in the second determination step. As described above, the determination of the operation keys is performed in two stages, and by setting a time limit, it is practically extremely likely that the operation mode shifts to the test mode when the user is unconscious. It becomes difficult. As a result, an unintended transition to the test mode can be appropriately prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic device according to an embodiment of the present invention will be described below with reference to the drawings, taking a vehicle-mounted disc changer as an example.

FIG. 1 is a block diagram showing an example of the configuration of a disc changer applied to an embodiment of the present invention. As shown, the disc changer includes a reset switch 1, operation keys 2, a microcomputer 3, a timer 4, and a disc exchange unit 5.

The reset switch 1 is a switch for supplying a reset signal to a reset terminal of the microcomputer 3. That is, when pressed by a user or the like, the reset switch 1 generates a reset signal instructing a power-on reset and supplies the reset signal to the microcomputer 3.

The operation keys 2 include a plurality of key switches and the like arranged on an operation panel and the like of the disc changer.
When an arbitrary key is pressed by a user or the like, information for identifying the pressed key is generated and supplied to the microcomputer 3. The operation keys 2 have a very small number of keys (for example, keys a,
Key b and key c, etc.).

The microcomputer 3 has a CPU (Cent
ral Processing Unit), ROM31 and RAM
32, and controls the entire disc changer. Specifically, the microcomputer 3 controls the disk exchange unit 5 and the like, and conveys a disk to be stored in the disk exchange unit 5 to a disk reproducing device (not shown). Further, the microcomputer 3 executes an operation mode switching process described later at the time of a power-on reset (when a reset signal is input, etc.) to perform a test mode operation for performing self-diagnosis or the like, or to carry a disk to a disk reproducing apparatus. Switch to one of the normal operations to be performed. That is, the microcomputer 3
At the time of power-on reset, it is determined whether or not there is an operation key 2 (a plurality of predetermined keys) pressed together with the reset switch 1, and the operation key 2 pressed within a predetermined time is determined.
(A plurality of keys according to a predetermined order) is determined. Then, according to the determination result, the microcomputer 3 executes one of a process for performing the operation in the test mode and a process for performing the normal operation.

A ROM (Read Only Memory) 31
Stores in advance a program executed by the microcomputer 3 and the like. For example, the ROM 31 stores in advance a program that defines the operation mode switching process. Also, RA
An M (Random Access Memory) 32 stores work information and the like required when the microcomputer 3 executes a program. For example, in the operation mode switching process, the RAM 32 stores information indicating whether or not the operation key 2 has been pressed and information for identifying the pressed key (a key buffer or the like).

The timer 4 is composed of an interval timer or the like, and is controlled by the microcomputer 3 and measures a set predetermined time. When the timer 4 finishes measuring the predetermined time, the timer 4 supplies a signal indicating the lapse of time to the microcomputer 3.

The disk exchange unit 5 is, for example, a CD
It comprises a storage unit for storing a plurality of disks such as (compact disks) and MDs (mini disks), and a bank-type disk exchange mechanism. The disk exchange unit 5 is controlled by the microcomputer 3 and pulls out a target disk from the storage unit as needed, and transports the disk to a turntable of a disk reproducing device (not shown).

Hereinafter, the operation of the disc changer according to the embodiment of the present invention will be described with reference to FIG.
FIG. 2 shows a microcomputer 3 of a disc changer.
6 is a flowchart for explaining an operation mode switching process executed by the user. The operation mode switching process is started at the time of a power-on reset (such as at the time of inputting a reset signal).

First, the microcomputer 3 determines whether or not the reset switch 1 has been pressed (step S11). If the microcomputer 3 determines that the reset switch 1 has not been pressed, the microcomputer 3 proceeds to step S19 described below. On the other hand, when determining that the reset switch 1 has been pressed, the microcomputer 3 determines whether a predetermined key of the operation keys 2 has been pressed (step S12). That is, the microcomputer 3 determines whether or not a plurality of predetermined keys (for example, two to three keys) among the operation keys 2 are pressed. Specifically, microcomputer 3
Determines whether the key a and the key b of the operation key 2 are depressed simultaneously with the reset switch 1.

When the microcomputer 3 determines that the predetermined key has not been pressed, it proceeds to step S19 described later.
Processing proceeds to On the other hand, when determining that the predetermined key is pressed, the microcomputer 3 causes the timer 4 to start measuring a predetermined time (step S13). That is, the microcomputer 3 sets a predetermined time (count value) in the timer 4 and causes the timer 4 to start counting the set count value.

The microcomputer 3 determines whether a predetermined time has elapsed (step S14). That is, the microcomputer 3 determines whether or not a signal indicating the lapse of time has been supplied from the timer 4. If the microcomputer 3 determines that the predetermined time has elapsed, the microcomputer 3 proceeds to step S19 described below. On the other hand, when it is determined that the predetermined time has not elapsed, the microcomputer 3 determines whether or not an illegal key of the operation keys 2 has been pressed (step S15). That is, the microcomputer 3 determines whether an incorrect key other than a plurality of keys (for example, two to three keys) in a predetermined order among the operation keys 2 is pressed.

When the microcomputer 3 determines that the unauthorized key has been pressed, the microcomputer 3 proceeds to step S19 described later. On the other hand, when it is determined that the unauthorized key has not been pressed, the microcomputer 3 determines whether all the valid keys have been pressed (step S16). That is, the microcomputer 3 includes, among the operation keys 2,
A plurality of predetermined keys (for example, two or three keys)
Is determined in a proper order. Specifically, the microcomputer 3 includes keys a to c of the operation keys 2.
Is determined in the order of key c → key a → key b.

When the microcomputer 3 determines that all the valid keys have not been pressed, the microcomputer 3 returns the processing to step S14, and repeatedly executes the processing of steps S14 to S16 described above. On the other hand, when determining that all the valid keys have been pressed, the microcomputer 3 stops the timer 4 from counting the time and resets the count value for counting the time (step S17).

Then, the microcomputer 3 starts the operation in the test mode (step S18). In other words, the microcomputer 3 controls the disk replacement unit 5 and the like to perform a predetermined operation for diagnosis and the like, and verifies the result.

When a predetermined time has elapsed in step S14, or when it is determined in step S15 that an illegal key has been pressed, the microcomputer 3 starts normal operation (step S19). In other words, the microcomputer 3 controls the disk exchange unit 5, pulls out the target disk from the storage unit as needed, and transports the disk to a turntable of a disk reproducing device (not shown).

As described above, by the operation mode switching process,
By discriminating the operation key 2 to be pressed in two steps, and by controlling the timer 4 to provide a time limit, the user can easily shift to the test mode by an unconscious operation. Is preventing that. That is, even if the user presses the reset switch 1 while pressing the two or three operation keys 2 by mistake, the disk changer does not shift to the test mode by itself. For this reason, it is extremely unlikely that the user unintentionally shifts to the test mode by the operation of the user. As a result, an unintended transition to the test mode can be appropriately prevented.

The operation key 2 to be pressed in the operation mode switching process (step S16) in the above embodiment.
Is determined by pressing a plurality of keys in a predetermined order, but the method of determining the validity of the operation key 2 is not limited to this, and is arbitrary. For example, a plurality of keys having a different combination from the operation key 2 determined in step S12 are defined for determining a valid key, and an operation is determined based on whether the plurality of keys are simultaneously pressed within a predetermined time. The validity of the key 2 may be determined.

In the above embodiment, the disc changer has been described as an example. However, the present invention is applicable to various electronic devices. For example, the present invention can be appropriately applied to telephone equipment, audio equipment, interior equipment, toys, and the like.

[0034]

As described above, according to the present invention,
Unintended transition to the test mode can be appropriately prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a configuration of a disc changer according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation mode switching process according to the embodiment of the present invention.

FIG. 3 is a block diagram illustrating an example of a configuration (main part) of a conventional electronic device.

FIG. 4 is a flowchart illustrating an operation mode switching process executed by a microcomputer of a conventional electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reset switch 2 Operation key 3 Microcomputer 4 Timer 5 Disk exchange unit 31 ROM 32 RAM

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // G11B 19/16 501

Claims (4)

[Claims] 1. An electronic device having a predetermined test mode function and having a reset switch and a plurality of operation keys, wherein when the reset switch is pressed, the plurality of operation keys pressed together are set in advance. It is determined whether or not the operation key matches a predetermined operation key. When the operation key is determined to be coincident, before a predetermined time elapses, the validity of a plurality of operation keys that are subsequently pressed is determined, and the operation is performed. An electronic device, wherein an operation mode is switched to a test mode when the validity of a key is determined. 2. An electronic apparatus having a predetermined test mode function and having a reset switch and a plurality of operation keys, wherein when the reset switch is pressed, the plurality of operation keys pressed together are set in advance. A first determination unit that determines whether the operation key matches a predetermined operation key; a timer unit that starts timing a predetermined time when the first determination unit determines that the operation key matches; A second determining unit that determines the validity of a plurality of operation keys that are subsequently pressed before the timing unit completes the time measurement; and a second determining unit that determines whether the operating keys are valid. Electronic mode, comprising: a mode switching unit configured to switch an operation mode to a test mode. 3. The apparatus according to claim 2, wherein said second determination means determines the validity of the operation keys when a plurality of operation keys are pressed in a predetermined order. Electronics. 4. An operation mode switching method for an electronic device having a predetermined test mode function and having a reset switch and a plurality of operation keys, wherein the plurality of the plurality of keys are simultaneously pressed when the reset switch is pressed. A first discriminating step of discriminating whether or not the operation key of the operation key coincides with a predetermined operation key; and, when the coincidence of the operation key is discriminated in the first discrimination step, timing of a predetermined time is started. A second determining step of determining the validity of a plurality of operation keys that are successively pressed before the timing is completed in the timing step; and A mode switching step of switching the operation mode to the test mode when the validity is determined.