JPS6172301A - Electronic device - Google Patents

Abstract

PURPOSE:To minimize effectively the shock given to a user by reading out the standard data in place of the last memory data to use it as the present control data in case it is decided that the last memory data is not read out correctly in response to the result of decision given to the check data. CONSTITUTION:The last memory data stored in a last data memory 37 is read out when a power supply is turned on. This memory data is used as the present control data to start actions of operating elements 13 and 3. For an electronic device of such a constitution, the check data having a prescribed format is added previously to the standard data and stored in a memory means 35. When the last memory data is read out, it is checked whether the check data read out together with the last memory data is correct or not. When it is decided that the check data is not read out correctly, the standard data is used as the present control data in place of the last memory data of the memory 37.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electronic devices, and in particular, control information such as on/off operation of a power switch, operation mode selection operation, operation condition setting operation, etc., is transmitted from a microcomputer to digital information. electronic devices, such as television receivers, video tape recorders (VT
R), suitable for application to radio receivers, audio amplifiers, etc.

[Conventional technology]

If this type of electronic device is configured so that each operating element can be controlled responsively using a microcomputer, the configuration of the electronic device itself can be made smaller and easier, and many types of electronic devices with different functions can be combined. Many benefits can be expected, such as the ability to unify the signal format of information exchanged between devices to digital signals when systemizing the device.

On the other hand, if the microcomputer receives a pulse-like disturbance similar to a digital signal, the microcomputer may malfunction, run out of control, or otherwise operate abnormally. If, as a result of such abnormal operation, the electronic device enters an operating state that is contrary to the user's expectations, there is an inconvenience that gives the user a sense of anxiety.

Possible causes of pulse-like disturbances to microcomputers include instantaneous power outages in commercial power supplies, chattering when power switches are turned on and off, and discharge phenomena within electronic devices, but no actual damage occurs when these disturbances occur. If the microcomputer could be made to operate in response, it would be quite effective as a countermeasure against external disturbances.

[Problem that the invention seeks to solve]

One disadvantage caused by disturbances in this type of electronic device is that the last memory data may be corrupted or not read correctly.

This last memory data is
= - The command data when the microcomputer operated each operating element in response to the last operation command input by the user in the past is stored in the last data memory, which is a non-volatile memory. By doing so, when the electronic device recovers from a power loss state, the initial operating conditions of the electronic device at the time of restarting the operation are determined by the last memory data.

However, if the last memory data stored in the nonvolatile memory is corrupted due to abnormal operation of the microcomputer when a disturbance occurs, or if it cannot be read correctly when the disturbance is restored, The electronic device may no longer be able to maintain the operating state it was in before the disturbance occurred, which may cause the user to feel uneasy.

For example, in the case of a television receiver, if the last memory data is not read correctly, the receiving channel may change unnecessarily from the channel before the disturbance to another channel, or the audio volume may change drastically. There is a risk that abnormal phenomena may suddenly occur, such as the volume suddenly switching to the maximum volume, or the image on the display screen decreasing in density and becoming extremely thin. Furthermore, even though the television receiver was set to "rTV mode" and was receiving one broadcast wave, the operating mode was switched due to a disturbance and the receiver was receiving the playback signal from the VTR.
It is conceivable that the mode may be switched to a ``video mode'' or an ``rRGB mode'' that receives RGB signals from an external character generator. At this time, since no signal is input from the VTR or character generator, no image appears.

If the television receiver were to suddenly change to a significantly different operating state without the user performing any operations, it would be a great shock to the user. This could lead to a significant loss of confidence in the machine.

The present invention has been made in consideration of the above points, and even if the microcomputer finally becomes unable to read data from the data memory due to a disturbance, it effectively minimizes the shock to the user. This paper attempts to propose an electronic device that can reduce the amount of energy used.

[Means for solving problems]

In order to solve this problem, in the present invention, when the power is turned on, the last memory data stored in the last data memory 37 is read out, and this is used as the current control data to start the operation of the operating element 13.3. In an electronic device, check data having a predetermined format is added to standard data and stored in the storage means 35 in advance, and when reading the last memory data, it is checked whether the check data read out at the same time is correct or not. Based on the determination result, it is determined whether or not the last memory data has been read out correctly. When it is determined that the last memory data has not been read out correctly, the standard data is replaced with the last memory data in the last data memory 37. Use it as current control data.

[Effect]

When reading the last memory data stored in the last data memory 37 in advance, the last data in the last data memory 37 is It is determined whether the data is corrupted or whether it has been read correctly. As a result, when it is determined that the last memory data has not been read correctly, the standard data is read and used as the current control data for the operating element.
There is no risk of setting the electronic device to an abnormal operating state that would make the user feel uneasy when the power is turned on. Therefore, it is possible to easily realize an electronic device that does not make the user feel anxious.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings as an embodiment in which it is applied to a television receiver. In FIG. 1, reference numeral 1 denotes an image receiving circuit, and each operating element thereof is controlled by a data processing control circuit 2, which is a microcomputer formed in an IC chip.

The image receiving circuit 1 tunes the received wave selected by the tuning circuit 3 in the tuner 4, and provides the tuned output to the video output circuit 6 and the audio output circuit 7 via the intermediate frequency amplification circuit 5. The video signal demodulated in this way is displayed on the cathode ray tube 8, and the reproduced audio signal is converted into audio at the speaker 9.

Here, the channel selection circuit 3 is given a channel selection signal SEL through the output terminal 11 of the data processing control circuit 2, and can select one of the receiving channels, that is, the first, second, . . . channels. It is done like this.

Further, the video output circuit 6 and the audio output circuit 7 are controlled via the analog controller 13 by a switching setting control signal ANC sent from the output terminal 12 of the data processing control circuit 2. The analog controller 13 first includes a mode switching signal forming circuit for switching modes in relation to the video signal, and selects rTV mode "rVTR-f--do" based on the switching setting control signal ANC. rRG
A mode switching signal for selecting "B-[--mode"] is applied to the video output circuit 6. Second, in relation to the video signal, the analog controller 13 includes a screen adjustment signal forming circuit composed of an up/down counter and a digital-to-analog conversion circuit that converts the contents into an analog value.
A screen adjustment signal is applied to the video output circuit 6 by the switching setting control signal ANC, so that the contrast and color density of the image displayed on the cathode ray tube 8 can be adjusted in conjunction (this is called picture control). ing.

In addition, in relation to the audio signal, the analog controller 13 first has an audio multiplex selection signal forming circuit, which supplies an audio multiplex selection signal to the audio output circuit 7 in accordance with the switching setting control signal ANC. It is possible to specify two audio signals multiplexed by , ie, a main audio signal and a sub audio signal, as necessary. In addition, the analog controller 13 has a volume control signal forming circuit configured with an up/down counter and a digital-to-analog conversion circuit, which is generated from the speaker 9 in accordance with the switching setting control signal ANC. It is possible to adjust the audio volume.

The channel selection signal SEL and the switching setting control signal ANC are sent to a central processing unit (C) provided in the data processing control circuit 2.
PU) 15 via bus 16 and further via interface circuits 17 and 18, respectively.

The user inputs an operation to the image receiving circuit 1 by transmitting an operation command signal MAS generated in a switch circuit 19 including knobs, keys, etc. provided on the operation panel of the television receiver via an interface circuit 21. , and is further fetched into the CPU 15 via the bus 16.

In addition, a receiving element 26 provided in the case of the television receiver receives a remote control signal RCT sent out when the user operates a remote controller 25 having a configuration similar to that of the key switch circuit 19. The remote control signal +RCT is input to the input terminal 28 of the data processing control circuit 2 via the remote control receiving circuit 27, and is taken into the ΩPU 15 via the interface circuit 29 and the bus 16.

The data processing control circuit 2 has a ROM 35 that stores programs to be executed by the CPU 15 and various basic data required when controlling the image receiving circuit 1.
5 is read out by the CPU 15 via the bus 16 as necessary.

Here, the ROM 35 includes, as part of the basic data, standard data for providing initial operating conditions when the image receiving circuit 1 resumes operation after power loss. In the case of this embodiment, the standard data first specifies the channel selection signal SEL as the second channel, secondly specifies the operation mode as "rTV mode" as an analog switching control signal, and sets the picture adjustment amount to 70%. ], specify the audio multiplex signal as the "main audio" signal, and set the volume to 30C%]?
has been established. Note that this standard data is not limited to this, and there are many settings that the user usually performs, so even if this accumulation control condition is reached when the receiving circuit 1 resumes operation, it will not give a strange impression to the user. It is only a matter of selection.

In addition, the operation command signal MAS and remote control signal RCT, which are respectively taken into the CPU 15 via the interface circuits 21 and 29, are sent to the CPU 15 as necessary.
After processing, the data is temporarily stored in the RAM 36. This temporarily stored data is transferred to bus 1 by CPUI 5.
6 as necessary, and the CPU 15 outputs a channel selection signal SEL and a switching setting control signal AN to the image receiving circuit 1.
These signals are sent to the image receiving circuit 1 via a bus 16 and further via interface circuits 17 and 18.

In addition to the above configuration, the data processing control circuit 2 is provided with a last data memory 37 composed of a non-volatile memory, and the CPU 15 communicates with the channel selection circuit 3 of the image receiving circuit 1 and the analog controller 13 via the bus 16. Tuning signal SE
When L and switching setting control signal ANC are sent out, data corresponding to these signals SEL and ANC is written into last data memory 37 via bus 16 as last memory data. The data written in this last data memory 37 is stored in the image receiving circuit 1 by the CPU 15.
When restarting, by transferring the data to the channel selection circuit 3 and analog controller 13 via the bus 16 and further via the interface circuits 17 and 18, the image receiving circuit engineer starts operation using the data in the last data memory 37 as initial data. It is made to be.

Here, when writing the last memory data into the last data memory 37, the CPU 15 adds a check signal of a predetermined format and writes the data together.

For example, the format of this check data is 2
Bit data “10” or “01” is used.

The format of this check data is determined based on the fact that when the microcomputer malfunctions, the contents of the data being processed become all rOJ or all "1". When the data stored in the memory 37 cannot be read correctly, the content of the read check data is "00".
” or “11”, the occurrence of this malfunction can be reliably determined.

The CPU 15 of the data processing control circuit 2 having the configuration shown in FIG.
Regarding reading and writing of data from the last data memory 37, the data is processed according to the processing procedure shown in FIG.

That is, in step SPI, when the power switch of the television receiver is turned on, the CPU 15 moves to step SP2 and extracts the last memory data from the last data memory 37 via the bus 16, and in the next step SP3, the CPU 15 extracts the last memory data from the last data memory 37. It is determined whether the contents of check data added to the data have a correct predetermined format. If the last data stored in the last data memory 37 is corrupted or not read correctly due to disturbance, the CPU
Step 15 obtains a negative result and moves to the next step SP4.

At this time, the CPU 5 does not use the last memory data read from the last data memory 37 as control data for the image receiving circuit 1, but instead reads standard data stored in the ROM 35 via the bus 16.
This is sent to the image receiving circuit l via interfaces 17 and 18.

As a result, the image receiving circuit 1 is set to a normal operating state determined based on the standard data.

That is, the image receiving circuit 1 sets the channel selection circuit 3 to the 2,000th channel selection state, and also sets the analog controller 3 to the 2,000th channel selection state.
, set the mode switching signal to "T mode",
The picture adjustment signal is adjusted to an adjustment amount of 70%, the audio multiplex selection signal is set to the "main audio" signal, and the volume adjustment signal is set to a volume of 30%.

After the setting of the standard data is completed, the CPU 15 moves to step SP5, adds check data having a regular format to the standard data (representing the current setting state of the image receiving circuit 1), and stores it in the last data memory 37. At this time, the last data memory 37 updates and stores the previously stored data with the newly written data.

The CPU 15 thus completes the operation of setting the control data in the image receiving circuit 1 based on the last memory data, and performs other processing in the next step SP6.

On the other hand, if it is confirmed that the data read out from the last data memory 37 has a predetermined format in the above-mentioned step SP3, the CPU 15 moves to step SP7 by obtaining a positive result in step SP3. The last memory data read from 37 is transferred to the image receiving circuit 1 as current control data. In this way, the analog controller 13 and the channel selection circuit 3 are set to the same content as the last data stored in the last data memory 37 (that is, the control data set in the image receiving circuit 1 immediately before the power was turned off). .

Thus, the image receiving circuit 1 enters the normal operating state after the source switch is turned on, but the CPU 15 performs the next step SP.
8, it is determined whether or not a new operation command has been input from the key switch circuit 19 or the remote controller 25. If a negative result is obtained, the process moves to the above-mentioned step SP6, performs other processing, and then proceeds to step SP8. return. This puts the CPUI 5 in a state where it waits for a new operation command to be issued.

In this state, when a new operation command is input from the key switch circuit 19 or the remote controller 25, an affirmative result is obtained in step SP8, and the CPU 15 moves to step SP9. In this step SP9, the CPU 15 transfers control data corresponding to the new operation command to the analog controller 1 of the image receiving circuit l.
3 and the channel selection circuit 3 to change the setting to the new control data state.

At the same time, in the next step 5PIO, the CPU 5 updates the last data memory 37 by writing the control data (i.e., the current control data) representing the changed settings of the analog controller 13 and the tuning circuit 3 as the last memory data. Other processing is performed in the subsequent step SP6, and then the process returns to the above-mentioned step SP8.

Thus, in the normal operating state, if there is a new operation command from the key switch circuit 19 or the remote controller 25, the CPU 15 changes the analog controller 13 and the channel selection circuit 3 of the image receiving circuit 1 to a new setting state in response to this command. After that, control data representing the state is written into the last data memory 37 and updated. Therefore, the last data memory 37 always stores control data representing the newest control state as last memory data.

By operating the CPU 15 according to the processing procedure shown in FIG. 2, if the last memory data is correctly read out from the last data memory 37 when the power switch is turned on, the continuously read last memory data is used as the current control. Image receiving circuit 1 is set as data. Since the setting state of the image receiving circuit l at this time matches the last memory data taken into the last data memory 37 immediately before the power switch is turned off, the user does not feel any discomfort when the power switch is turned on. The user can see the display on the cathode ray tube 8 of the image receiving circuit 1 without feeling anything, and can also hear the audio from the speaker 9. By the way, just before turning off the power switch, the user would normally have been listening to the sound at the most visible image density and the most audible volume, so it would be strange to reproduce this state after turning the power switch on. is considered not to be angry.

On the other hand, when the power switch is turned on, if the last memory data in the last data memory 37 is corrupted for some reason or cannot be read correctly, the CPU 5 determines this in step SP3. Standard data previously stored in the ROM 35 is provided to the image receiving circuit 1 as initial data after the power is switched on.

Therefore, we decided to use standard data that users may feel uncomfortable with.
e fL! ,,yo4゜1-ka4-111ka1,4
If control data is selected in advance so that the image receiving circuit 1 can be set to a so-called "unnoticeable operating state" such as when the power switch is turned on, the user will not feel any anxiety or discomfort when viewing the images and sounds that occur when the power switch is turned on. You can accept it without feeling pleasure.

Of course, if the program selected based on this standard data does not match the program you want to watch, you can select the channel again using the key switch direction 19 or the remote controller 25, and such operation is generally done mechanically. This operation is accepted by the user as a natural operation similar to the channel selection operation on a television receiver that has various operation elements. Incidentally, in the case where the image receiving circuit 1 is set using corrupted data successively output in the last data memory 37 instead of using standard data as in the case of FIG. As in the case where the volume setting is abnormally high, a sound that surprises the user will suddenly be generated from the speaker 9, so it is unavoidable to avoid causing great discomfort to the user. Not only is there no
This may cause a sense of anxiety about the television receiver, but such a problem can be effectively avoided by configuring it as shown in FIG.

In addition, although the embodiment in which the present invention is applied to a television receiver has been described above, the present invention is not limited to this.
Even if the present invention is applied to devices such as radios, audio amplifiers, etc. in which operating elements are controlled using a microcomputer, the same effects as those described above can be obtained.

In addition, in the above, we have described the response operation when the power switch is turned on from the off state, but for example, the CPU 15 may malfunction due to a momentary power outage in the commercial power supply, chattering when the power is restored, or a discharge phenomenon in an electronic device, and the The last memory data of data memory 37 may be corrupted,
Even if the data cannot be read out correctly, the same operation as described above with reference to FIG. 2 can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, when the data in the last data memory that stores the last memory data indicating the final control algae cultivation state of the electronic device is corrupted or cannot be read correctly, this By supplementing with data, it is possible to easily realize an electronic device that does not effectively make the user feel anxious.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an electronic device according to the present invention, and FIG. 2 is a flowchart for explaining its operation. DESCRIPTION OF SYMBOLS 1... Image receiving circuit, 2... Data processing control circuit, 3... Tuning circuit, 13... Analog controller, 15......- CPU, 19・
...Key switch circuit, 25...Remote controller, 37...Last data memory.

Claims (1)

[Claims] In an electronic device that reads the last memory data stored in the last data memory when the power is turned on and uses the last memory data as the current control data to start operating the operating element, check data is added to the standard data in advance. is added and stored in the storage means, and when reading the last memory data, it is determined whether or not the check data has been correctly read, thereby determining whether or not the last memory data has been correctly read. If it is determined that the data has not been read correctly according to the determination result for the check data, the standard data is read out and used as the current control data in place of the last memory data of the last data memory. Featured electronic devices.