JPH1124915A - Program write device in electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a program write device in an electronic apparatus which can rewrite a control program without providing a private connector in the electronic apparatus. SOLUTION: A micro computer 4 reads data from a master ROM 2 b an ON signal supplied from the start key of a write jig 1, coverts it into serial data having a prescribed format and supplies it to an RCA terminal 6 provided for a television set 7. CPU 12 discriminates whether a signal received through the RCA terminal 6 is a program (serial) data or a video data. When it is discriminated as a program data, and area where the control program of CPU 12 in a flash memory is loaded is deleted, and program data are sequentially written into the control program storage area of the flash memory 13 for each one byte, for example.

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 CPU therein and performing various control operations by the CPU. In particular, the present invention relates to an electronic device through a connection terminal normally provided in the electronic device. The present invention relates to a program writing device in an electronic device capable of changing and rewriting a control program.

[0002]

2. Description of the Related Art In recent years, electronic devices having a microcomputer system therein (television receivers, VTRs, DVD players, audio components, Hoshiboshi broadcasting receivers, so-called AV devices such as CATV terminals, etc.) have become common. I have. These are, for example, CPs for controlling various circuits (devices) inside the electronic device of the electronic device (hereinafter also referred to as AV device).
U, and a flash memory, an EEP memory, and a PROM (hereinafter, collectively referred to as a flash memory) for storing a program of the CPU.
Various circuits (devices) provided inside the electronic device are controlled via a bus to which a flash memory is connected.

Further, specifications have become complicated with the advancement of functions of AV equipment and the like, and A
The control of various circuits (devices) provided inside the V equipment is also becoming more and more complicated. As a result, defects (so-called bugs) caused by the microcomputer software are found after or immediately before the AV device is shipped to the market, and the function specifications are frequently changed, thereby integrating the functions of the AV device. The microcomputer system that manages and controls (C
It becomes necessary to change the program of the PU) frequently.

Recently, as described above, a flash memory or the like is used instead of a mask ROM as a medium (memory) for storing a program of a microcomputer system (CPU), and the memory is not physically replaced. In addition, the program can be modified while being mounted on a set (electronic device). Hereinafter, an example of the method will be described.

FIG. 6 is a conceptual diagram showing an example of a conventional program writing device for an electronic device, and is a diagram showing how a microcomputer system (CPU) of an AV device is changed in a program.

In FIG. 6, a CPU 44 constituting a microcomputer system for controlling various circuits (devices) and a part or all of a control program of the CPU are stored on a television chassis 41 inside a television set. Flash memory 45 and the CPU 44
Further, a terminal 46 provided on a bus line of the flash memory 45 is provided. A dedicated connector 43 is connected to the terminal 46, and the terminal 46 is connected to the writing jig 40 via the dedicated connector 43 and the bus cable 42. In the above configuration, the bus line of the CPU 44 and the flash memory 45 and the writing jig 40 are connected via the bus cable 42 to the writing jig 40.
However, it is also possible to transfer data from the jig 40 to the flash memory 45 by a different data transfer method by providing an I / F circuit on the bus line.

In the above-described configuration, by operating the writing jig 40, the correction program is
2. The data is transferred to the flash memory 45 via the dedicated connector 43 and the terminal 46. As described above, the control program of the CPU 44 stored in the flash memory 45 is rewritten.

By the way, in the above-described conventional program writing apparatus for electronic equipment, when the program is rewritten from outside the television set by the writing jig 40,
Must be done via a dedicated connector. For example, when rewriting a program using a serial data transfer method or the like, a separate I / F circuit or the like is required. In any case, a dedicated connector and a dedicated terminal used when rewriting the program are required. There was a problem that cost was high.

Furthermore, in some cases, it is necessary to open the cabinet of the AV equipment and connect the dedicated connector to a dedicated terminal, which is inconvenient and causes a significant decrease in work efficiency (defect).

[0010]

As described above, in the conventional program writing device for electronic equipment, when the control program of the CPU stored in the flash memory is rewritten from outside the television set by the jig, a dedicated connector is used. Through the network, which is costly. Further, in some cases, when rewriting the control program, it is necessary to open the cabinet of the AV equipment and connect the above-mentioned connector, which is inconvenient and causes a problem (defect) that the working efficiency is significantly reduced.

Therefore, the present invention has been made in view of such a problem,
It is an object of the present invention to provide a program writing device in an electronic device capable of rewriting a control program without using a dedicated connector and without lowering work efficiency.

[0012]

According to a first aspect of the present invention, there is provided a program writing apparatus for an electronic device, comprising a predetermined input terminal, and a predetermined input terminal input from the input terminal. An electronic device that performs a predetermined operation based on the signal of the electronic device, a bus line that connects a plurality of circuits and elements in the electronic device to each other, and each of the plurality of circuits and elements via the bus line. Control means for performing various controls by the control means, storage means for storing a control program defining control operations to be performed on each of the plurality of circuits and elements by the control means, and serial data of a predetermined format input from the input terminal. Detecting means for detecting that the serial data of a predetermined format has been input, and detecting the serial data of a predetermined format by the detecting means. A storage erasing unit for erasing stored data; and a unit for writing serial data of a predetermined format input from the input terminal to a predetermined area of the storage unit erased by the storage erasing unit. It is characterized by having been done.

According to a second aspect of the present invention, there is provided a program writing device for an electronic device, comprising: an AV input terminal;
An AV electronic device that performs a predetermined operation based on a video signal input from the AV input terminal, the bus line interconnecting a plurality of circuits / elements in the AV electronic device, and the plurality of circuits / Control means for performing various controls on each of the elements via the bus line; storage means for storing a control program defining control operations to be performed on each of the plurality of circuits and elements by the control means; Detecting means for detecting that serial data of a predetermined format has been input from an input terminal; and when the detecting means detects that serial data of a predetermined format has been input, the detection data is stored in a program area of the storage means. Memory erasing means for erasing data; and inputting the program area of the memory means erased by the memory erasing means from the input terminal. Characterized in that it is configured by including a means for writing the serial data in a predetermined format is.

According to a third aspect of the present invention, there is provided a program writing device for an electronic device according to the first or second aspect, wherein the bus line comprises an I ² C bus. According to a fourth aspect of the present invention, there is provided a program writing device for an electronic device according to any one of the first to third aspects.
6. The program writing device for an electronic device according to claim 5, wherein the serial data in the predetermined format is I ² C or UART format serial data. In the program writing device, the storage means is constituted by a flash memory, an EEP memory, or a PROM.

According to the first to fifth aspects of the present invention, for example, a control means (CPU or the like) for controlling various circuits (devices) and a flash memory for storing a program of the control means therein And EEP memory and PR
Various circuits (devices) provided inside the electronic device through a bus line such as an I ² C bus to which the control means and the storage means are connected. In an electronic device such as an AV device configured to be controlled (for example, a television set), when rewriting the program or data (setup value) or the like from outside the electronic device using a writing jig or the like,
Detecting means for detecting serial data (program data or the like) output by the writing jig is provided in the electronic device;
When the supply of the serial data output from the writing jig to an AV terminal such as an RCA pin jack, an S terminal, or a skirt jack for connecting the AV device (electronic device) to an external device is detected, The storage means is rewritten by serial data (program data or the like) supplied via the AV terminal.

According to this, when the control program of the control means stored in the storage means provided in the electronic device is rewritten from outside the electronic device (such as a television set), the program is transmitted through the AV terminal. The dedicated connector shown in the above-mentioned conventional problem can be eliminated, thereby reducing the cost and opening the cabinet of the electronic device and providing the dedicated connector on a predetermined substrate in the electronic device. This eliminates the need to connect the terminal to the terminal, thereby eliminating inconvenience and the accompanying reduction in work efficiency.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a program writing device in an electronic device of the present invention. Note that a television set will be described as an example of the electronic apparatus in FIG. 1 includes a writing jig 1, a television set 7, and a cable 5 connecting the writing jig 1 and the television set 7.

The writing jig 1 includes a master ROM 2 storing a control program to be corrected,
The microcomputer 4 includes a microcomputer 4 for reading the control program data from the OM 2 and transferring it as serial data to the television set 7, and a start button (switch or the like) 3 for instructing the microcomputer 4 to turn on / off.

The television set 7 has an RCA pin jack (hereinafter referred to as RCA) for inputting serial data supplied from the writing jig 1 via the cable 5.
Terminal) 6, a tuner / PIF circuit 8 for amplifying and detecting the frequency-converted video intermediate frequency output signal and outputting a video signal and an audio intermediate frequency signal, an AV switch 9, a video processing circuit 10, a CRT 11, The various circuits (devices)
, And a flash memory 13 for storing a control program for the CPU 12. In the above configuration, the input terminal of the serial data supplied from the writing jig 1 via the cable 5 is connected to the RC.
A terminal, but other AV such as S terminal or skirt terminal
Terminals may be used.

Next, an operation of writing the control program of the CPU 12 from the writing jig 1 to the flash memory 13 of the television set 7 will be described with reference to FIGS. FIG. 2 is a flowchart showing the operation of the writing jig 1. FIG. 3 is a flowchart showing the operation of the television set 7. First, an operation of externally writing a program, that is, an operation of the writing jig 1 will be described.

As shown in the flowcharts of FIGS. 2 and 3, the microcomputer 4 reads data from the master ROM 2 in response to an ON signal supplied from a start button of the writing jig 1 (steps S1 and S2). Next, the microcomputer 4 reads the data read from the master ROM 2
Convert to serial data with a predetermined format,
The signal is supplied to the RCA terminal 6 provided on the television set 7 via the cable 5 (step S3).

On the other hand, the CPU 12 of the television set 7
Receives serial data supplied from the writing jig 1 via the cable 5 via the RCA terminal 6. Then, the CPU 12 determines whether the signal received (input) from the writing jig 1 is program (serial) data or video data, and if the signal is determined to be program data, the control program of the CPU 12 of the flash memory 13 is stored. (Steps T1 and T1)
2) Read the program data input from the writing jig 1 (step T3).

Then, the read program data is written to the control program storage area of the flash memory 13 in, for example, one byte unit (step T).
4). This operation is performed for all the program (serial) data sent from the writing jig 1 to complete the operation of writing the control program of the CPU 12 from the writing jig 1 to the flash memory 13 of the television set 7. (Step T5).

Thereafter, the writing jig 1 is detached together with the cable 5 and, for example, a VTR or the like (not shown) is connected to the connection RCA terminal 6, so that the television set 7 is controlled based on the rewritten control program. Operate.

Next, as a data format of serial data supplied from the writing jig 1 to the CPU 12 of the television set 7 via the cable 5, for example, UA
RT (Universal Asynchronous Receiver / Transmitte
r) Two cases of a format and an I ² C (Inter-IC) format will be described.

The former is a data format used for asynchronous communication of full-duplex transmission and half-duplex transmission. Generally, various circuits (devices) in the above-described electronic equipment (television set) include a control bus and a data bus. , And a bus line composed of an address bus and the like. The latter is a data format used for half-duplex transmission asynchronous communication, and generally has a configuration in which various circuits (devices) inside the above-described electronic device (television set) are connected to an I ² C bus. Used in case. In the latter case, the electronic device (television set) does not require an I / F circuit for performing communication control.

FIG. 4 is a block diagram showing a program writing device in the electronic device of the present invention when the data format of the serial data supplied from the writing jig to the electronic device is the UART format.

A program writing device in the electronic apparatus shown in FIG. 4 includes a writing jig 1 and a television set 7.
And a cable 5 connecting the writing jig 1 and a television set (electronic device) 7.

The writing jig 1 includes a bus line constituted by a control bus 17, a data bus 18 and an address bus 19, a master ROM connected to the bus line and storing a control program to be corrected. A CPU 16 for reading the control program data from the master ROM 2, an I / F circuit 1 for converting the control program data read from the CPU 16 into serial data in a UART format and transferring the serial data to a television set 7
5, an input control unit 14 for controlling the input means (not shown) such as a keyboard and supplying the CPU 16 with a command from the input means (a command for reading the control program data from the master ROM 2). .

The television set 7 includes an RCA terminal 6 for inputting serial data supplied from the writing jig 1 via the cable 5, a control bus 17, a data bus 18, and an address bus 19. A tuner / PIF circuit 22, an AV switch 23, a video processing circuit 24, a CRT 25, and a bus line connected to the bus line for amplifying and detecting the video intermediate frequency output signal and outputting a video signal and an audio intermediate frequency signal. CPU 26 and CPU 2 for controlling the various circuits (devices)
The flash memory 27 stores data such as a control (basic operation) program of No. 6, and serial data in UART format is converted and supplied to the flash memory 27.

Next, the operation of the program writing device in the electronic apparatus configured as described above, that is, the operation of writing the control program of the CPU 26 from the writing jig 1 to the flash memory 27 of the television set 7 will be described.

The CPU 16 of the writing jig 1 sends a command to the master R in response to a command supplied from the input control device 14.
Read data from OM2. The data read from the master ROM 2 is transmitted to the I / F via the bus line.
It is supplied to the circuit 15. The I / F circuit 15 converts (encodes) the data read from the master ROM 2 into serial data in a UART format, and converts the data into a RC set provided in the television set 7 via the cable 5.
Supply to A terminal 6.

On the other hand, the CPU 26 of the television set 7
Are the cable 5 and the RCA terminal 6 from the writing jig 1
Transmitted (supplied) to the I / F circuit 21 via the
It is determined whether the serial data (signal) of the format is program (serial) data or video data. CPU
When it is determined that the received UART format serial data (signal) is program (serial) data, the area 26 erases an area in the flash memory 27 where the control program of the CPU 26 is stored, and
/ F circuit 21 to decode the received UART format serial data (signal), and to transfer the program data input from the writing jig 1 via the bus line to the flash memory in units of, for example, 1 byte. The data is sequentially transferred to the control program storage area 27 and written. This operation is performed for all the program (serial) data sent from the writing jig 1, and the operation of writing the control program of the CPU 26 from the writing jig 1 to the flash memory 27 of the television set 7 is completed.

Thereafter, the writing jig 1 is removed together with the cable 5, and for example, a VTR or the like (not shown) is connected to the connection RCA terminal 6, so that the video signal input from the RCA terminal 6 is sent to the AV switch 23. The video signal is supplied to the video processing circuit 24, subjected to signal processing, and displayed on the CRT 25. That is, the television set 7 operates based on the rewritten control program.

When a video signal is input from the RCA terminal 6 in the program writing device for an electronic device having the above configuration, the video signal is also supplied to the I / F circuit 21. Only when serial data (in this case, UART format serial data) is input, the CPU 26
(It does not operate when a signal other than serial data such as a video signal is input), so there is no problem.

FIG. 5 is a block diagram showing a program writing device in the electronic device of the present invention when the data format of the serial data supplied from the writing jig to the electronic device is the I ² C format.

5 includes a writing jig 1, a television set (electronic equipment) 30, and a cable 5 connecting the writing jig 1 and the television set 30.

The writing jig 1 includes a bus line composed of a control bus 17, a data bus 18 and an address bus 19, a master ROM 2 connected to the bus line and storing a control program to be corrected. A CPU 16 for reading the control program data from the master ROM 2; an I / F circuit 2 for converting the control program data read from the CPU 16 into I ² C format serial data and transferring the serial data to the television set 7
8, an input control device 14 for controlling the input means (not shown) such as a keyboard and supplying the CPU 16 with a command from the input means (command for reading out the control program data from the master ROM 2). .

On the other hand, the television set 30 has a two-wire bidirectional system comprising an RCA terminal 6 for inputting serial data supplied from the writing jig 1 via the cable 5 and a clock line 37 and a data line 38. An I ² C bus line composed of a serial bus, and a tuner / PIF circuit 32 and an AV switch 31 connected to the bus line for amplifying and detecting the video intermediate frequency output signal and outputting a video signal and an audio intermediate frequency signal. , video processing circuit 33, CRT 34, I ² with C performs bus control of the bus line, CPU 35 for controlling the various circuits via the I ² C bus lines (device), as well as control of the CPU 35 (basic operation) program And the like are stored in the flash memory 36 storing the data.

Incidentally, the I ² C bus is an Inter-bus.
An abbreviation for IC bus, which is a data communication bus that can perform basic functions of LAN (Local Area Network) such as bidirectional transmission, random access, distributed control, and collision processing. This is a two-wire bidirectional serial bus featuring stop bit method, collision processing by open collector type drive, etc., and acknowledgment check for each basic transmission unit.

Next, the operation of the program writing device in the electronic device configured as described above, that is, the operation of writing the control program of the CPU 35 from the writing jig 1 to the flash memory 36 of the television set 30 will be described.

The CPU 16 of the writing jig 1 sends a command to the master R by a command supplied from the input control device 14.
Read data from OM2. The data read from the master ROM 2 is transmitted to the I / F via the bus line.
The signal is supplied to a circuit 28. The I / F circuit 28 converts (encodes) the data read from the master ROM 2 into I ² C format serial data, and converts the data into a RC set provided in the television set 30 via the cable 5.
Supply to A terminal 6.

On the other hand, the CPU 3 of the television set 30
5 is transmitted from the write jig 1 to I ² C bus lines via the cable 5 and the RCA pin 6 (supply) have been I ²
It is determined whether the C format serial data (signal) is program (serial) data or video data. CP
When it is determined that the received serial data (signal) is program (serial) data, the U35 erases an area in the flash memory 36 where the control program of the CPU 35 is stored, and the U35 The program data (the received serial data in the I ² C format) input from the writing jig 1 is sequentially transferred to the control program storage area of the flash memory 36 in units of 1 byte, for example, to perform writing. This operation is performed on all the program (serial) data sent from the writing jig 1, and the flash jig 1 of the television set 30 is sent from the writing jig 1.
6, the operation of writing the control program of the CPU 35 is completed.

Thereafter, the writing jig 1 is removed together with the cable 5, and a VTR or the like (not shown) is connected to the RCA terminal 6, so that the video signal input from the RCA terminal 6 is supplied to the AV switch 31. And
Signal processing is performed by the video processing circuit 33, and an image is displayed on the CRT 34. That is, the television set 30 operates based on the rewritten control program.

In the program writing device in the electronic device having the above configuration, when a video signal is input from the RCA terminal 6, the video signal flows directly into the I ² C bus. For example, a skirt terminal or the like is used in place of the RCA terminal, and a line for transmitting a video signal and a line for transmitting serial data such as an I ² C format are separated.
When the PU 35 detects the start of operation of the AV switch 31,
By controlling switch means (not shown), the RCA terminals 6 and I
Such as by turning off the connection between ² C bus can be prevented from flowing directly the video signal to the I ² C bus.

As described above, in recent years, a CPU (microcomputer) has been installed in an electronic device (such as a television set).
And the number of circuits (devices) constituting electronic equipment controlled by the CPU is increasing, and an I ² C bus is used as a means (data bus) for transmitting a signal for the control. There are relatively many things. Therefore, I ² C is used as the writing jig and the data bus.
In data transmission between electronic devices using a bus, I ² C
The use of serial data in a format can be significant.

[0047]

As described above, according to the present invention, when a control (basic operation) program or the like of a CPU (microcomputer) incorporated in an electronic device is rewritten by a writing jig, the conventional program is provided on the electronic device side. This eliminates the need for a dedicated connector. Thus, when the dedicated connector is provided in a cabinet, for example, the inconvenience of having to open the cabinet and connect the connector when rewriting a program can be eliminated, and work efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a program writing device in an electronic device of the present invention.

FIG. 2 is a flowchart showing the operation of a writing jig.

FIG. 3 is a flowchart showing an operation of the television set.

FIG. 4 is a block diagram showing a program writing device in the electronic device of the present invention in a UART format.

FIG. 5 is a block diagram showing a program writing device in the electronic device of the present invention in the I ² C format.

FIG. 6 is a conceptual diagram showing an example of a conventional program writing device for an electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Write jig 2 ... Master ROM 3 ... Start button 4 ... Microcomputer 5 ... Cable 6 ... RCA terminal 7 ... Television set 8 ... Tuner / PIF circuit 9 ... AV switch 10 ... Video processing circuit 11 ... CRT 12 ... CPU 13 … Flash memory

Claims (5)

[Claims] An electronic device having a predetermined input terminal and performing a predetermined operation based on a predetermined signal input from the input terminal, wherein a plurality of circuits and elements in the electronic device are connected to each other. A bus line to be connected, control means for performing various controls on each of the plurality of circuits / elements via the bus line, and a control operation performed by the control means for each of the plurality of circuits / elements are defined. Storage means for storing the obtained control program; detection means for detecting that serial data of a predetermined format has been input from the input terminal; and when the detection means has detected that serial data of a predetermined format has been input. A storage erasing means for erasing data stored in a predetermined area of the storage means, and a predetermined area of the storage means erased by the storage erasing means, Program writing device in an electronic device, characterized by comprising a means for writing the serial data inputted from the input terminal a predetermined format. 2. An image processing apparatus, comprising: an AV input terminal for performing a predetermined operation based on a video signal input from the AV input terminal;
V electronic equipment, a bus line interconnecting a plurality of circuits / elements in the AV electronic equipment, and control means for performing various controls on each of the plurality of circuits / elements via the bus line Storage means for storing a control program defining a control operation performed by the control means on each of the plurality of circuits / elements; detection means for detecting that serial data of a predetermined format has been input from the input terminal A memory erasing unit for erasing data stored in a program area of the memory when the detecting unit detects that serial data of a predetermined format has been input; and Means for writing serial data of a predetermined format input from the input terminal to a program area of the storage means. Program writing device in an electronic device, wherein the door. 3. The program writing device according to claim 1, wherein said bus line comprises an I ² C bus. 4. The program writing device according to claim 1, wherein the serial data in the predetermined format is I ² C or UART format serial data. 5. The storage means includes a flash memory or an EE.
5. The program writing device according to claim 1, wherein the program writing device is a P memory or a PROM.