JP2001243053A - Unit device, unit device control system, unit device control method, and recording medium - Google Patents

Abstract

(57) [Problem] To provide a unit device capable of updating an operation program in a unit device to a new generation compatible device when a plurality of unit devices are connected. SOLUTION: When another unit device 3 is connected, the generation of the other unit device 3 transmitted from the other unit device 3 and the generation of the own unit device 1 stored in the own generation storage area 62 are provided. If the generation of the own unit 1 is newer than the generation of the other unit 3, the new generation corresponding to the operation of the other unit 3 stored in the update program storage area 63 is supported. Is transmitted to another unit device 3 to be updated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for controlling various unit devices such as an audio unit, a navigation unit, and an air conditioner unit mounted on an automobile or the like.

[0002]

2. Description of the Related Art Recent automobiles include a clock unit and an AM.
/ FM radio unit, audio units such as cassette tape recorder unit, compact disc (CD) player unit, mini disc (MD) player unit, car navigation unit,
Various unit devices such as an air conditioner unit are mounted.

As shown in FIG. 25A, for example, 199
1997 model AM / FM radio integrated cassette tape recorder unit (hereinafter referred to as A
M / FM cassette recorder unit) 51 and CD
The player unit 52 is connected via a bus 54 and an analog signal line 55. Analog signal line 55
Is a line for communicating analog signals such as voices, and the bus 54 is a line for communicating digital signals of various information. Information exchange by the bus 54 is performed according to a computer program stored in a memory in each of the units 51 and 52. At the same time (1997)
When the units 51 and 52 developed in the above are connected, information exchange by the bus 54 is normally performed, and no problem occurs.

[0004]

As shown in FIG. 25B, for example, an MD player unit 53 of a 1998 model developed in 1998 is replaced with the unit 5 described above.
A case is considered in which connection is made to buses 1 and 52 via a bus 54 and an analog signal line 55. In this case, the units 51 and 5
Since the product development time is different between the unit 2 and the unit 53, information exchange between units via the bus 54 may not be performed normally. For example, information display on the MD player unit 53 (for example, display of “MD” when the unit 53 is operating) may not be normally performed on the AM / FM cassette recorder unit 51. Also, A
In response to the remote operation on the M / FM cassette recorder unit 51, the MD player unit 53 may not operate at all or some functions may not operate normally.
This is the unit 51,5 developed earlier (1997).
2 does not correspond to the new function of the unit 53 developed later (1998).

In the process of developing a new unit 53, computer programs are often shared with the previous units 51 and 52, and improvements are often made. In this case, if improvement is prioritized, the common use is made. At the expense of it, it becomes difficult to achieve complete common computer programs between units.

An object of the present invention is to provide a unit device, a unit device control system, a unit device control method, and a recording medium that can solve such a problem.

[0007]

The unit device of the present invention stores a generation storage area for storing a generation indicating a development time or a sales time of its own unit device, and an operation program for operating its own unit device. The operation program storage area to be operated, the update program storage area for storing an update program corresponding to a new generation for operating another unit apparatus of an older generation than the own generation, and the generation of the own unit apparatus are connected. Transmitting means for transmitting, to the other unit device, a new generation-compatible update program for operating the other unit device stored in the update program storage area when the generation is newer than the generation of the other unit device. It is characterized by having.

The unit device of the present invention has a generation storage area for storing a generation indicating a development time or a sales time of its own unit device, and an operation program storage for storing an operation program for operating its own unit device. When the area and the generation of the own unit device are older than the generation of the connected other unit device, the update program corresponding to the new generation transmitted from the other unit device is stored in the operation program storage region. And updating means for updating the data.

Further, the unit device of the present invention can update the operation program inside the unit device to a new generation compatible one when unit devices of different generations indicating development time or sales time are connected to each other. A device, a generation storage area for storing the generation of its own unit device, an operation program storage area for storing an operation program for operating its own unit device, and another unit of a generation older than its own generation An update program storage area for storing an update program corresponding to a new generation for operating the apparatus, and when another unit apparatus is connected, the generation information of the other unit apparatus transmitted from the other unit apparatus and the update information Comparing means for comparing the generation of the own unit device stored in the generation storage area, and a result of the comparison by the comparing means When the generation of the own unit device is newer than the generations of the other unit devices, the update program corresponding to the new generation for operating the other unit device stored in the update program storage area is used for the other generation device. As a result of comparison by the transmitting means for transmitting to the unit device and the comparing means, when the generation of the own unit device is older than the generation of the other unit device, the new generation corresponding to the new generation transmitted from the other unit device is supported. Updating means for updating the update program by storing the update program in the operation program storage area.

In another aspect of the unit apparatus of the present invention, the initial operation program storage area for storing the same operation program as the operation program initially stored in the operation program storage area; Normal end detecting means for detecting whether or not the update processing has been completed; and, when the update processing has not been normally completed, storing the operation program stored in the initial operation program storage area in the operation program storage area. Operating program initialization means for restoring the operating program in the operating program storage area to the initial state.

Further, the unit device according to the present invention can update an operation program in the unit device to a new generation-compatible one when unit devices having different generations indicating the development time or the sales time are connected to each other. A device, a generation storage area for storing the generation of its own unit device, an operation program storage area for storing an operation program for operating its own unit device, and another unit of a generation older than its own generation An update program storage area for storing an update program corresponding to a new generation for operating the device, an accommodation generation storage area for storing the generation of the update program stored in the update program storage area, and another unit device are connected. Then, the generation information of the other unit device transmitted from the other unit device and the generation storage area Comparing means for comparing the stored generation of the own unit with the stored generation of the unit; if the result of the comparison by the comparison means indicates that the generation of the own unit is newer than the generation of the other unit, Transmitting means for transmitting to the other unit device an update program corresponding to a new generation for operating the other unit device stored in the area and generation information stored in the accommodated generation storage region; As a result of the comparison by the means, when the generation of the own unit is older than the generation of the other unit, the update program corresponding to the new generation transmitted from the other unit and the generation information of the update are described above. Update means for updating the update program and the generation by storing them in the operation program storage area and the generation storage area It is characterized in.

[0012] The unit device control system of the present invention, when the first and second unit devices of different generations indicating the development time or the sales time are connected to each other, changes the operation program inside the unit device to a new generation compatible one. A unit device control system for updating, wherein the first unit device has a generation storage area for storing a generation of the own unit device and an operation program storage area for storing an operation program for operating the own unit device. And an update program storage area for storing an update program corresponding to a new generation for operating a unit device of a generation older than its own generation, and a generation of its own unit device is greater than a generation of the second unit device. Is also new, the update program for the new generation stored in the update program storage area is stored in the second Transmission means for transmitting to the knitting device, wherein the second unit device has a generation storage area for storing the generation of its own unit device, and an operation program for storing an operation program for operating its own unit device When the storage area and the generation of its own unit device are older than the generation of the first unit device, the update program corresponding to the new generation transmitted from the first unit device is stored in the operation program storage region. And updating means for updating.

[0013] A unit device control method according to the present invention is a unit device control method for updating an operation program inside a unit device to a new generation compatible one when unit devices having different generations indicating development time or sale time are connected to each other. And, when the generation of the own unit device is newer than the generation of the connected other unit device, the update program corresponding to the new generation for operating the other unit device is applied to the other unit device. The transmitting step, and when the generation of the own unit is older than the generation of the other connected unit, the update program corresponding to the new generation transmitted from the other unit is stored in the own unit. And updating.

A recording medium according to the present invention is a computer recording a computer program for updating an operation program inside a unit device to a new generation when unit devices of different generations indicating a development time or a sales time are connected to each other. On a readable recording medium, when the generation of the own unit is newer than the generation of the connected other unit, the update program corresponding to the new generation for operating the other unit is used as the update program. The procedure for transmitting to the other unit device, and when the generation of the own unit device is older than the generation of the connected other unit device, the update program corresponding to the new generation transmitted from the other unit device is transmitted to the self. And a procedure for causing a computer to execute the procedure for storing and updating in a unit device. The features.

[0015]

According to the present invention, when a unit of a new generation is developed, an update program of another unit corresponding to the new generation is stored in the update program storage area of the unit, and the unit of the own unit is stored. An operation program necessary for the operation of the operation program is stored in the operation program storage area. When the new generation unit device is connected to the old generation unit device, the update program stored in the update storage area of the new generation unit device is transmitted to the old generation unit device, and the old generation unit device is transmitted. It is updated and stored in the operation program storage area of the unit device. As a result, the old generation unit device is updated to the new generation and operates normally even when connected to the new generation unit device.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an arrangement state of each unit constituting an on-vehicle unit device control system in which the present invention is implemented in a vehicle, and FIG. 2 is a block diagram showing an example of a hardware configuration of each unit. .

A 1997 model AM / FM cassette recorder unit 1 and a CD developed in 1997
Player unit 2 is sold and then
It is assumed that a 1998 MD player unit 3 developed in 1998 was sold. The unit 1 and the units 2 and 3 are mutually connected via a bus 11 and an analog signal line 12. Unit 1 and unit 2,
The unit 3 may be a unit having an equal relationship, or a unit having a master-slave relationship such as a head unit and another unit.

As shown in FIG. 2, the AM / FM cassette recorder unit 1 includes a CPU 31, a memory 32, an amplifier 33, and a communication circuit 34 for communicating with other units.
It has a monitor (display) 35, a function controller 36 for controlling each function of the unit 1, and an operation panel 37. A speaker 39 is connected to the amplifier 33 in the unit 1, and the audio signal amplified by the amplifier 33 is generated by the speaker 39. Specifically, the sound of the AM / FM radio or the cassette tape reproduced by the AM / FM cassette recorder unit 1 is output by the speaker 39 via the amplifier 33. In addition, the audio signal reproduced by the CD player unit 2 and the MD player unit 3 is generated by the speaker 39 via the amplifier 33. Monitor 35
Displays various information such as operation menus and operation states of the functions of the units 1, 2, and 3. The user operates the operation panel 3 based on the operation menu displayed on the monitor 35.
By performing the operation 7, the unit 1 or the functions of the units 2 and 3 connected to the unit 1 can be controlled.

The units 2 and 3 include a CPU 31 and a memory 3
2. Communication circuit 34 for communicating with other units, function controller 36 for controlling each function of units 2 and 3
have. An operation panel similar to the operation panel 37 of the unit 1 may be provided in the units 2 and 3 so that the functions of the units 2 and 3 can be controlled.

FIG. 3 is a diagram showing a display example of an operation menu on the monitor 35 of the unit 1, and FIG.
FIG. 3B shows a display example of the operation menu when the CD player unit 2 is selected, and FIG. 3B shows a display example of the operation menu when the MD player unit 3 is selected.

As shown in the figure, the display screen of the monitor 35 of the unit 1 has a performance state display (operation state display) section 35a indicating the performance state of the units 2 and 3,
3 has an operation menu display section 35b for each function. The operation panel 37 has a select button 37a, an OK button 37b, and increase / decrease buttons 37c and 37d.

When the CD player unit 2 is selected, as shown in FIG.
D "is displayed. On the other hand, as shown in FIG.
When the D player unit 3 is selected, “MD” is displayed on the upper right of the monitor 35. Conventionally, when the units 1 and 2 are the 1997 model and the unit 3 is the 1998 model, the previously developed units 1 and 2 do not correspond to the new functions of the unit 3 developed later.
When the CD player unit 2 is selected, “CD” is normally displayed on the upper right of the monitor 35, but when the MD player unit 3 is selected, “MD” is displayed on the upper right of the monitor 35. In some cases, the operation menu of the unit 3 was not displayed. In some cases, the functions of the unit 3 cannot be controlled by operating the operation panel 37. In the present embodiment, normal operation is guaranteed even when units having different product development times are connected. Hereinafter, the description will be made.

As shown in FIG. 4A, for example, 1997
A 1997 model AM / FM cassette recorder unit 1 and a CD player unit 2, which were developed in 1997, are connected via a bus 11 and an analog signal line 12. The analog signal line 12 is a line for communicating analog signals such as voices, and the bus 11 is a line for communicating digital signals of various information. Information exchange by the bus 11 and control of each unit of the units 1 and 2 are performed according to a computer program stored in a memory in each of the units 1 and 2.

Thereafter, as shown in FIG. 4 (B), for example, the MD player unit 3 of the 1998 model developed in 1998 is connected to the units 1 and 2 via the bus 11 and the analog signal line 12. And connect them. In practice, the connection box 13 connects the bus 11 and the analog signal line 12.

The MD player unit 3 of the 1998 model developed later includes the old model (1997 model).
An updated program obtained by upgrading a computer program (hereinafter, referred to as a program) built in the units 1 and 2 is stored. When the MD player unit 3 is connected to the AM / FM cassette recorder unit 1 and the CD player unit 2, the update program in the MD player unit 3 is automatically supplied to the AM / FM cassette recorder unit 1 and the CD player unit 2, The computer programs in the AM / FM cassette recorder unit 1 and the CD player unit 2 are updated. Next, the details will be described.

As shown in FIG. 5, in 1997, 19
It is assumed that the 1997 model units 1 and 2 are sold as products, connected to each other, and mounted on an automobile. The unit 1 has an operation program storage area 21 for storing a program 21a for operating the unit 1 itself, and 19
It has an all-unit program storage area 22 for storing programs 22a and 22b of all units 1 and 2 corresponding to the 1997 model. Program 21a and program 22
The same as a. Similarly, the unit 2 has an operation program storage area 23 for storing a program 23a for operating its own unit 2, and an all-unit program storage for storing programs 24a and 24b of all units 1 and 2 corresponding to the 1997 model. It has a region 24.
The program 23a and the program 24b are the same.

Thereafter, in 1998, it is assumed that the unit 3 of the 1998 model was sold. Unit 3
Is a program 2 for operating its own unit 3
5a, an operation program storage area 25 for storing
It has an all-unit program storage area 26 for storing programs 26a, 26b, 26c of all units 1, 2, 3, supporting the 8-year model.

When the unit 3 is connected to the units 1 and 2 and mounted on an automobile, programs 26a and 26b in the unit program storage area 26 of the unit 3 are supplied to the units 1 and 2, respectively. The program 21a in the operation program storage area 21 of the unit 1 is updated to a program 26a corresponding to the 1998 model. The program 23a in the operation program storage area 23 of the unit 2
Is updated to the program 26b corresponding to the 1998 model.

AM / FM cassette recorder unit 1
Is normally displayed on the monitor 35 as "C
Although "D" or "MD" and the operation menu of each unit 2 and 3 can be displayed, "CD" can be displayed in the program 21a before the update of the unit 1, but "M" is displayed.
D "or the operation menu of the unit 3 may not be displayed. However, the program 21a of the unit 1
Is updated to the program 26a, so that the unit 1
On the monitor 35, not only "CD" but also "MD" and an operation menu of the unit 3 can be displayed.
In the program 21a before the update, even if the operation panel 37 of the unit 1 is operated, it may not be possible to control all or a part of the function of the unit 3, but the program 21a may be updated to the program 26a. By
By operating the operation panel 37 of the unit 1, all functions of the unit 3 can be normally controlled. The program 26a corresponding to the 1998 model is a program improved so that the unit 3 can be connected to the unit 1.

Further, in 1999, 1999
Assume that the year model unit 4 is sold. The unit 4 has an operation program storage area 27 for storing a program 27a for operating its own unit 4,
All units 1,2,3,4 for 999 model
All the unit program storage areas 28 for storing the programs 28a, 28b, 28c, 28d.

When the unit 4 is connected to the units 1, 2, 3 and mounted on an automobile, the programs 28a, 28b, 28 in the whole unit program storage area 28 of the unit 4 are provided.
c is supplied to units 1, 2, 3 respectively. The program 26 in the operation program storage area 21 of the unit 1
a is updated to the program 28a corresponding to the 1999 model. The program 26b in the operation program storage area 23 of the unit 2 is updated to a program 28b corresponding to the 1999 model. The program 25a in the operation program storage area 25 of the unit 3 is updated to the program 28c corresponding to the 1999 model. Unit 1,
The programs in 2, 3 are updated, and the units 1, 2, 3, 4 operate normally even after connection.

FIG. 6 shows a unit device control in which unit devices 1 and 3 having different generations (for example, unit model year) indicating the development time or the sales time are mutually connected via a bus 11 and an analog signal line 12. It is a block diagram of a system. When the connection is established, the operation program in the unit device can be updated to a new generation-compatible one.

Each of the units 1 and 3 includes an operation program storage area 61, a generation storage area 62, an update program storage area 63, an accommodation generation storage area 64, a comparison means 65, a transmission means 66, an update means 67, and an initial operation program storage. It has an area 68, a normal end detecting means 69, and an operation program initializing means 70.

The operation program storage area 61 corresponds to the operation program storage areas 21 and 25 in FIG. 5, and stores an operation program for operating its own unit device. The generation storage area 62 stores the generation (for example, model year) of its own unit device. The update program storage area 63 corresponds to the all unit program storage area 2 in FIG.
2 and 26, and stores an update program corresponding to the new generation for operating another unit device of the same generation as the own generation and / or an older generation than the own generation. The accommodation generation storage area 64 stores the generation of the update program stored in the update program storage area 63.

Next, the operation of the unit device 1 will be described. The operation of the unit device 3 is the same. Comparison means 65
When the other unit device 3 is connected, the generation information of the other unit device 3 transmitted from the other unit device 3 and its own storage device stored in the generation storage area 62 of its own unit device 1 The generation information of the unit device 1 is compared. As a result of the comparison, when the generation of the own unit device 1 is newer than the generation of the other unit device 3, the transmitting unit 66 transmits the other unit device 3 stored in its own update program storage area 63. Update program for accommodating new generation and accommodation generation storage area 64
Is transmitted to another unit device 3 to be updated. As a result of the comparison, when the generation of the own unit device 1 is older than the generation of the other unit device 3, the updating means 67 updates the update program corresponding to the new generation transmitted from the other unit device 3 and the update program corresponding to the new generation. The generation of the update program is stored in its own operation program storage area 61 and generation storage area 62 to update the update program and generation.

The initial operation program storage area 68 stores the same operation program as the operation program stored in the operation program storage area 61 at the initial stage. The normal end detecting means 69 detects whether or not the updating means 67 has normally completed the updating process, and records the detection result. For example, recording is performed with the flag set to 1 or 0. When the update processing is not normally completed, the operation program initialization means 70 stores the operation program stored in the initial operation program storage area 68 in the operation program storage area 61 and stores the operation program in the operation program storage area 61. Restore the program to its initial state.

Next, let us consider a case where the units 1 and 2 were released in 1997, and the units 3 and 4 were additionally released in 1998. Unit 1 has a model number (unit number) of 001 and a generation number of 00
1 (1997 model), an AM / FM radio integrated mechanical cassette stereo recorder unit (with CD control function). Unit 2 has a model number (unit number) of 002 and a generation number of 001 (19
1997 model) and a CD player unit.
Unit 3 has a model number (unit number) of 003, a generation number of 002 (1998 model), and A
M / FM radio integrated full logic cassette stereo recorder unit (with CD and MD control function). Unit 4 has a model number (unit number) of 00
4, the generation number is 002 (1998 model), and it is an MD player unit.

A module with improved processing of the FM tuner according to the 1998 model (module number: 00
2) A module for making the CD control correspond to the MD (module number: 004), a module for making the monitor display of the unit 1 correspond to the MD (module number: 006), and a module for common key input processing (module) Version number 007) is upgraded, and the version number is set to 002.

FIG. 7 is a diagram showing the configuration of the memory 32 (FIG. 2) of each of the units 1, 2, 3, and 4. Units 1-4
Have the same configuration, and will be described together below. The memory 32 includes a flash memory 41, a mask ROM 42, an E ² PROM 43, a RAM 44 having a work area, and a mask ROM 45.

An example of the configuration of the memory 32 of the unit 1 is shown in FIG.
3, FIG. 15, FIG. 16, and FIG. Examples of the configuration of the memory 32 of the unit 2 are shown in FIG. 14, FIG. 15, FIG. 16, and FIG. 18 and 2 show examples of the configuration of the memory 32 of the unit 3.
0, FIG. 21, and FIG. Examples of the configuration of the memory 32 of the unit 4 are shown in FIGS. Hereinafter, the details will be described.

The flash memory 41 corresponds to the operation program storage areas 21, 23, 25, and 27 of FIG. 5, and stores a main program and a module program. These operation programs are stored in a new model (new generation).
It will be updated if you connect the unit. 13 shows a configuration example of the flash memory 41 of the unit 1 (model number 001), FIG. 14 shows a configuration example of the flash memory 41 of the unit 2 (model number 002), and FIG.
A configuration example of the flash memory 41 of (model number 003) is shown, and FIG. 19 shows a configuration example of the flash memory 41 of the unit 4 (model number 004).

The main program in the flash memory 41 has basic information such as a model number (unit number), a version number, and a list of used modules (including a module number and a version number). It is a program that issues commands to each module based on information from each module (program) and controls it later. For example, when information indicating that the AM key on the unit 1 is pressed is input from the key input module, a tuning command is issued to the AM tuner module, tuning frequency information is input from the AM tuner module, and the display is displayed on the LCD display module. Instruct.

The module program in the flash memory 41 is a program that has a module number and a version number as basic information and performs control for each component (AM tuner, operation panel, etc.). In accordance with the instructions of the main program, the components are controlled via the basic program in the mask ROM 42. For example, the modules include a module that controls an AM tuner (component) and a module that controls a cassette mechanical unit (component). Since modules depend on components, not on units, some modules can be shared by all units that use the components.

The mask ROM 42 stores a basic program and is not updated even when a new model (new generation) unit is connected. FIG. 13 shows unit 1 (model number 00).
FIG. 14 shows an example of the configuration of the mask ROM 42 of the unit 2 (model number 002), and FIG. 18 shows an example of the configuration of the mask ROM 42 of the unit 3 (model number 003). 19 shows a configuration example of the mask ROM 42 of the unit 4 (model number 004).

The basic program in the mask ROM 42 has a model number (unit number) as basic information, and controls hardware and an interface such as arranging each port of the microcomputer in hardware.
This is a program for starting a program (start processing, connection check), updating an old model program, and linking modules.

The E ² PROM 43 functions as a non-volatile backup memory and stores rewritable information. FIG. 13 shows the E ² PR of unit 1 (model number 001).
FIG. 14 shows a configuration example of the OM 43, and FIG. 14 shows a configuration example of the E ² PROM 43 of the unit 2 (model number 002).
FIG. 19 shows a configuration example of the E ² PROM 43 of the unit 3 (model number 003), and FIG.
¹ shows a configuration example of the E ² PROM 43.

The E ² PROM 43 stores a current generation number (year number of a unit model), a program OK flag, and information (for example, a radio preset frequency) that must be stored for the unit. The above-mentioned generation number represents, for example, a model number of a unit model such as a 1997 model. However, since a model change does not always occur every year, a serial number may be assigned to each model change. The current generation number indicates the generation number of the program currently stored in the flash memory 41. The above-mentioned program OK flag is a flag indicating whether or not the program has been correctly updated. If the program has not been correctly updated, the flag is used to return the program to the initial state.

The mask ROM 45 corresponds to all the unit program storage areas 22, 24, 26, and 28 in FIG. 5, and stores an update program group. FIG. 15 shows unit 1 (model number 001) and unit 2 (model number 0).
02) shows a configuration example of the mask ROM 45 having common contents,
FIG. 20 shows a unit 3 (model number 003) and a unit 4
A configuration example of a mask ROM 45 having common contents of (model number 004) is shown. Units having the same generation number (model year number) have the same contents of the mask ROM 45.

The mask ROM 45 contains an accommodation generation number (generation number of the program group 45d accommodated in the mask ROM 45), an accommodation main program list (model number,
It stores a version number and accommodation address 45b, an accommodation module list (including module number, version number and accommodation address) 45c, and a main program and module group 45d. FIGS. 16 and 17 show examples of the configuration of the main program and module group 45d having the common contents of the unit 1 (model number 0001) and the unit 2 (model number 002). FIGS. 21 and 22 show the unit 3 (model number 003). And unit 4 (model number 00
4) Main program and module group 4 with common contents
5d shows a configuration example. The main program and module group 45d includes a main program and a module for updating an old generation program of another unit to a new generation program.

An example will be described in which the units 1 and 2 of the 1997 model are connected to the unit 4 of the 1998 model. By this connection, the memory contents of the unit 1 shown in FIG. 13 are updated to the memory contents shown in FIG.
The memory contents of the unit 2 shown in FIG. 14 are updated to the memory contents shown in FIG. Next, the details will be described with reference to flowcharts.

FIG. 8 is a flowchart showing the processing performed by each unit when the units 1 and 2 of the 1997 model are connected to the unit 4 of the 1998 model. The units 1, 2, and 4 all perform the processing of the following flowchart.

In step SA1, after connecting the units, the driver turns the key cylinder of the vehicle to drive the ACC.
(Accessory key) When the power is turned on, the power is supplied to the accessory equipment.

Next, in step SA2, a preparation is made so that data from another unit can be received via the bus.

Next, at step SA3, the E ² PROM
Check the state of the program OK flag stored in 43. The initial state of the program OK flag is 1
(Yes), and becomes 1 (Yes) when the main program and the module in the flash memory 41 are updated normally, and 0 (No) when the update is not performed normally due to, for example, a power failure. )become. When the program OK flag is 0, the process proceeds to step SA4, and then proceeds to step SA5. On the other hand, when the program OK flag is 1, the process goes to step SA5, bypassing step SA4.

In step SA4, the contents in the flash memory 41 are returned to the initial state to prevent the normal operation from being performed due to the failure of the update processing, and the flash memory 41 is returned to the operable state. I do. Step SA4
Will be described later with reference to the flowchart of FIG.

At step SA5, the initial data of the own unit is transmitted to other units via the bus. Here, the initial data includes the model number of the own unit (stored in the basic program in the mask ROM 42) and the current generation number (E ² PROM 4) of the own unit.
3) and the accommodation generation number of the own unit (stored in the mask ROM 45).

Next, in step SA6, the process waits for reception of initial data transmitted from another unit. In particular,
Wait for the time necessary to reliably receive the initial data of all units connected to its own unit. The waiting time is determined by how long it takes to initialize the program. During this waiting time, the initial data from all the units connected to itself is received and stored in the buffer.

Next, in step SA7, the reception of the initial data is completed, and it is confirmed that the initial data is stored in the buffer.

Next, in step SA8, based on the received initial data in the buffer, the model number, the current generation number, and the accommodation generation number of the connected unit are obtained, and further, the model number of the own unit and the current generation number are acquired. The generation number and the accommodation generation number are acquired, and a connection state table shown in FIG. 9A is created. For example, for a unit having a number N of 1, the model number is 001 (unit 1), the current generation number is 001, and the accommodation generation number is 001. The unit whose number N is 2 has a model number of 002 (unit 2) and a current generation number of 00.
1 and the accommodation generation number is 001. The unit whose number N is 3 has a model number of 004 (unit 4),
The current generation number is 002, and the accommodation generation number is 002.

Next, in step SA9, it is determined whether or not there is another unit connected to the unit other than the own unit by referring to the connection state table (FIG. 9A). If there is no other unit, there is no need to update the program in its own unit, so a normal operation (for example, an audio operation) is started. On the other hand, if there is another unit, the process proceeds to step SA10.

In step SA10, the connection status table (FIG. 9)
With reference to (A)), it is determined whether or not all connected units have the same current generation number. If the current generation numbers are all the same, a normal operation (for example, an audio operation) is started because there is no need to update the program in the own unit. On the other hand, if the current generation numbers are not all the same, the process proceeds to step SA11.

At step SA11, the connection state table (FIG. 9)
With reference to (A)), it is determined whether or not its own unit has the latest current generation number among all connected units. If it does not have the latest current generation number, it is necessary to update the program in its own unit, so the process proceeds to step SA12. On the other hand, when it has the latest current generation number, it is not necessary to update the program in its own unit, but there is a possibility that it becomes a host for supplying the updated program to other units.
Proceed to. For example, in the case of FIG. 9A, the model number is 001.
And the unit of 002 goes to step SA12 to function as a client, and the unit of model number 003 goes to step SA13.

At step SA12, the client receives the distribution of the update program from the host determined later, and thereafter starts the normal operation (eg, audio operation). The details of step SA12 will be described later with reference to the flowchart of FIG.

At step SA13, the connection state table (FIG. 9)
With reference to (A)), it is determined whether or not the condition that the accommodation generation number of the own unit is the largest and the model number of the own unit is the smallest among the units having the latest current generation number described above. to decide. If the above conditions are met,
Since that unit is the only host, step SA
Proceed to 15. On the other hand, if the above condition is not satisfied, the unit is not selected as a host, and the process proceeds to step SA1.
Proceed to 4. For example, in the case of FIG.
The unit No. 4 proceeds to step SA15 and functions as a host.

The meaning of “the largest accommodation generation number” in the above condition will be described with reference to the connection state table of FIG. 9B. According to this connection state table, step SA11
, The unit whose model number is 001 is
Proceed to step 12 to function as a client. Then, the accommodation generation number of the unit having the model number 004 is 002, and the accommodation generation number of the unit having the model number 002 is 00.
Therefore, in step SA13, the unit of the model number 004 having the larger accommodation generation number is set in step SA1.
The unit proceeds to 5 and functions as a host, and the unit of the model number 002 having the smaller accommodation generation number proceeds to step SA14.

Here, the unit of model number 002 is
Initially, the current generation number was 001, but after that, the program was updated and the current generation number became 002, and the accommodation generation number remains 001. An accommodation generation number of 001 means that an update program with a generation number of 001 is stored. If the unit with the model number 002 is selected as the host, the accommodation generation number is 001, and the generation number is 00.
The first update program is distributed to the client, which is not preferable. Therefore, when there are a plurality of units having the latest current generation number, the unit having the model number 004 is selected as the host and the generation number 0
02 can be appropriately distributed to the client.

It should be noted that the above condition is satisfied if the unit satisfies the condition of “having the latest current generation number and having the largest accommodation generation number”, even if there are a plurality of units. Any of the units may be the host. In order to select one unit to be the host, in step SA13, the condition is that “the unit has the smallest model number”, but other conditions may be used. For example, the unit having the largest model number may be used, or any one unit may be selected.

In step SA14, there is no need to update the program of the own unit, and the process simply waits for the process of distributing the update program from the host to be completed. Thereafter, a normal operation (for example, an audio operation) is started.

In step SA15, the update program is distributed (transmitted) on the bus as a host. Details of step SA15 will be described later with reference to the flowchart of FIG. Thereafter, a normal operation (for example, an audio operation) is started.

FIG. 10 is a flowchart showing details of the program initialization process in step SA4 in FIG. 8, and corresponds to the operation program initialization means 70 in FIG.
This process is a process of returning the contents of the flash memory 41 (FIG. 13, etc.) to the initial state because the program was not updated normally.

In step SB1, the main program corresponding to the own model number in the update program group stored in the mask ROM 45 (FIG. 15, etc.) in the own unit is stored in the flash memory 41 (FIG. 13, etc.). Transfer and copy to main program storage area.

Next, in step SB2, referring to the list of used modules of the transferred main program, the modules necessary for the main program are stored in the flash memory 41 (FIG. 13 and the like) from its own mask ROM 45 (FIG. 15 and the like). ) And copy it to the module storage area.

Next, in step SB3, the accommodation generation number 45a in the update program group stored in its own mask ROM 45 (FIG. 15, etc.) is stored in the E ² PROM (backup memory) 43 (FIG. 13, etc.). The current generation number is stored in the current generation number storage area as the current generation number.

[0074] Next, in step SB4, the program
To record that initialization was successful,^TwoP
ROM (backup memory) 43 (Fig. 13 etc.) professional
The gram OK flag is set to 1 (Yes). With the above, processing
To end.

FIG. 11 is a flowchart showing details of the reception process from the host in step SA12 in FIG. This process is a process in which the own unit acts as a client to receive and update a program from a host that is another unit.

In step SC1, the process waits for the update program to be distributed from the host. During this time, the host distributes the program to the unit to be updated via the bus.

Next, in step SC2, when updating the program, if the power is turned off during the update and the update is not completed normally, it is clear that the main program and the module in the flash memory 41 are abnormal. E ² PROM (backup memory) 43
The program OK flag of FIG. 13 and the like is set to 0 (No).

Next, in step SC3, the main program to be updated is received from the host via the bus, and written in the main program storage area of the flash memory 41 (FIG. 13 and the like).

For example, in the unit 1, before updating, the main program 41 in the flash memory 41 of FIG.
The version number of the main program 41 in the flash memory 41 of FIG.
The version number of “a” is updated to “002”. In the unit 1, before updating, the flash memory 4 of FIG.
Module number 0 in the used module list 41b in 1
The version number of 02,004,006,007 is 00
1 after updating, the flash memory 4 of FIG.
Module number 0 in the used module list 41b in 1
The version number of 02,004,006,007 is 00
It is updated to 2. In the unit 2, since there is no need to update the main program in accordance with the model change, the main program is not updated.

Next, in step SC 4, the module is received from the host via the bus, and written in the module storage area of the flash memory 41. Before performing this writing, it is necessary to clear the module storage area.

For example, in the unit 1, before the update, the module number 002, 004, 006, 007 of the module 41c in the flash memory 41 in FIG. The version numbers of the module numbers 002, 004, 006, and 007 of the module 41c in the memory 41 are updated to 002. In the unit 2, since it is not necessary to update the module used for the main program in accordance with the model change, the module is not updated.

Next, at step SC5, the host
Received the generation number via ^TwoPROM (back
(Up memory) 43 (FIG. 13, etc.) current generation number storage area
As the current generation number.

For example, in the unit 1, before the update, the current generation number 43a of the E ² PROM (backup memory) 43 in FIG. 13 was 001, but after the update, the E ² PROM (backup memory) 43 in FIG. Is updated to 002. Further, in the unit 2, before the update, the current generation number 43a of the E ² PROM (backup memory) 43 in FIG. 14 was 001, but after the update, the E ² PROM (backup memory) 4 in FIG.
3 is updated to 002. In the unit 2, the main program and the module are not updated, but the current generation number is updated.

Next, in step SC6, to record that the update of the program has been completed normally, E ² PRO
Set the program OK flag of M (backup memory) to 1
(Yes). This processing corresponds to the normal end detecting means 69 in FIG.

Next, in step SC7, when the host finishes the distribution to all clients, the host transmits the distribution completion data.
The process ends.

FIG. 12 is a flowchart showing details of the host update program distribution processing in step SA15 of FIG. In this process, the host distributes the update program to the client.

At step SD1, the connection status table (FIG. 9)
(A)) The number N in is set to 1. In step SD2, the model number, current generation number, and accommodation generation number of the number N in the connection status table (FIG. 9A) are loaded (acquired).

At step SD3, it is determined whether or not the loaded model number matches its own model number. If they match, the unit of that model number is its own unit and is not subject to updating, so the process proceeds to step SD8. On the other hand, if they do not match, the process proceeds to Step SD4.

At step SD4, it is determined whether or not the loaded current generation number matches the current generation number of its own unit. If they match, the unit of the current generation number is the latest current generation number (the same current generation number as that of the host) and is not subject to updating, so the process proceeds to step SD8. On the other hand, if they do not match, the unit is to be updated, and the flow advances to step SD5.

At step SD5, the self mask ROM
The main program corresponding to the loaded model number is transmitted to the client via the bus from the group of update programs stored in 45.

Next, in step SD6, by referring to the list of used modules of the transmitted main program, the module necessary for the main program is read from the update program group stored in its own mask ROM 45 by the bus. To the client via

Next, in step SD7, the accommodation generation number 45a stored in its own mask ROM 45 is transmitted to the client via the bus. Thus, the transmission of the update program to the unit corresponding to the loaded model number is completed.

Next, at step SD8, 1 is added to the number N in the connection status table (FIG. 9 (A)), and the next number N is set as a processing target.

Next, in step SD9, it is determined whether or not a model number is described in the model number column of the number N in the connection status table (FIG. 9A). If the model number is described, there is a possibility that a unit to be updated may still remain, so the flow returns to step SD2 to repeat the above processing. On the other hand, if the model number is not described, it means that the processing for all units has been completed, and the process proceeds to step SD10.

Next, in step SD10, distribution completion data is transmitted to the other unit via the bus in order to notify the other unit that the update processing has been completed. Above,
The process ends.

Next, another example of the program distribution processing from the host will be described. In the above example, if the current generation number loaded in step SD4 of FIG.
Then, the case where the main program and the module used for the main program are transmitted to another unit has been described. However, when upgrading from an old generation to a new generation, not all main programs and the modules used for them are changed (updated). For example, as shown in FIG. 24, the main program of the unit 2 may not be updated. Even in this case, since the program which does not need to be updated is transmitted, the transmission time of the program is wasted. There are few problems when a bus system that can perform high-speed transmission is used, but when a relatively low-speed bus system is used, the problem of a long waiting time until the operation starts is prominent. . Therefore, waiting time can be reduced by eliminating useless transmission time.

More specifically, since the main program and the module are given version numbers, the main program and the modules held by the other units are transmitted before the main program and the respective modules are transmitted from the host to the other units. The version number of each module is compared with the main program to be transmitted from the host and the version number of each module.

As shown in FIG. 23, in the flash memory 41 of the unit 1, since the main program and the module numbers 002, 004, 006, and 007 need to be set to 002, the main program and the module need to be transmitted. There is. However, as shown in FIG. 24, in the flash memory 41 of the unit 2, both the main program and the module have version numbers 0.
01, it is not necessary to transmit the main program and module. However, as shown in FIG. 24, the current generation number of the E ² PROM 43 needs to be the latest generation number of 002.

As described above, when the first unit of a new model (new generation) having a new generation number is developed, the new model (new generation) is stored in all unit program storage areas of the first unit. The programs of all the corresponding units are stored, and the programs necessary for the operation of the own unit are stored in the operation program storage area. When the first unit of the new model is connected to the second unit of the old model with an earlier product development time, the second unit in the program storage area of all units of the first unit is stored in the second unit. The corresponding program is transmitted to the second unit, and is updated and stored in the operation program storage area of the second unit. As a result, the second unit is updated to the new generation number, and operates normally even when connected to the first unit.

If a plurality of units are connected, the operation program in the units is automatically updated without complicated operation by the user. That is, the user updates the operation program in each unit every time the model is changed,
For example, it is not necessary to perform an update operation for reading the update program stored in the CD-ROM into each unit, and the operation program can be easily updated.

As shown in FIG. 7, since the entire unit program storage area is not changed, the entire unit program storage area is read-only in mask ROM 4.
5. Since the operation program storage area may be updated, the operation program storage area is provided in the rewritable flash memory 41.

When a new unit is developed, a generation number indicating the development time or the sales time is added to the unit, and it is determined whether or not the program needs to be updated based on the generation number, and the host or the host is updated. Clients can be determined automatically. When the generation numbers of the connected units are the same, each unit can operate normally without updating the program. On the other hand, if the generation numbers of the connected units are different, the normal operation of each unit is not guaranteed, so that it is necessary to update the program of the unit with the old generation number to a program corresponding to the new generation. Units having the same generation number have the same contents in all unit program storage areas.

By dividing the module used for the main program into a plurality of modules, some modules can be used in common among a plurality of units, and it is necessary to store the same module redundantly. As a result, the number of update modules stored in all unit program storage areas can be reduced.

By providing the program OK flag in the E ² PROM 43, the power is turned off during the updating of the program, and if the program is not written normally, the operation program (main program etc.) in the unit is initialized. Since the state can be returned, loss or runaway of the program due to failure in updating the program can be prevented.

The above units include an AM / FM radio unit, a cassette tape recorder unit, a player unit, an MD player unit, a CD changer,
The present invention can be applied to various units such as an audio unit such as an MD changer, a clock unit, a car navigation unit, an air conditioner unit, and a TV unit.

A program implemented by supplying a program code of software for realizing the functions of the above-described embodiment to a unit and operating the various units according to a program stored in a computer (CPU or MPU) of the unit. Are also included in the scope of the present invention.

In this case, the program code itself of the software realizes the functions of the above-described embodiment, and the program code itself and means for supplying the program code to the computer, for example, the program code The stored recording medium constitutes the present invention. As a recording medium for storing such a program code, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM and the like can be used.

Each of the above embodiments is merely an example of an embodiment for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. is there. That is, the present invention can be embodied in various forms without departing from the spirit or main features thereof.

[0109]

As described above, according to the present invention, when a unit of a new generation is developed, an update program of another unit corresponding to the new generation is stored in an update program storage area of the unit. An operation program necessary for operating the own unit device is stored in the operation program storage area. When the new generation unit device is connected to the old generation unit device, the update program stored in the update storage area of the new generation unit device is transmitted to the old generation unit device, and the old generation unit device is transmitted. Is updated and stored in the operation program storage area of the unit device. As a result, the operation program of the old generation unit device is updated to the new generation, and operates normally even when connected to the new generation unit device.

If a plurality of unit devices are connected,
The operation program in the unit device is automatically updated without complicated operation by the user. That is, the user does not need to perform an update operation for reading the update program stored in the CD-ROM into each unit device, for example, in order to update the operation program in each unit device each time the generation changes, which is simple. The operation program can be updated at the same time.

Further, when the normal end detecting means and the operation program initializing means are provided, for example, when the power is turned off during the operation program update processing and the operation program is not written normally, Since the operation program in the unit device can be returned to the initial state, it is possible to prevent the operation program from disappearing or running away due to a program update failure.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement state of each unit constituting a vehicle-mounted unit device control system in an automobile.

FIG. 2 is a block diagram illustrating an example of a hardware configuration of each unit.

FIG. 3 is a diagram showing a display example of an operation menu on a monitor of an AM / FM cassette recorder unit.

FIG. 4 is a diagram showing a configuration of a system in which a plurality of units are connected.

FIG. 5 is a diagram showing an example in which a program is automatically updated when a plurality of units are connected.

FIG. 6 is a block diagram for explaining a functional configuration of each unit.

FIG. 7 is a block diagram illustrating a configuration example of a memory of each unit.

FIG. 8 is a flowchart illustrating a procedure of a control process executed in each unit.

FIG. 9 is a diagram showing a connection state table created by each unit.

FIG. 10 is a flowchart illustrating a procedure of a program initialization process executed by each unit.

FIG. 11 is a flowchart illustrating a procedure of processing in which a unit serving as a client receives distribution data from a host.

FIG. 12 is a flowchart illustrating a procedure of a process in which a unit serving as a host distributes the update program.

FIG. 13 is a diagram showing contents of a memory of the unit 1;

FIG. 14 is a diagram showing contents of a memory of a unit 2;

FIG. 15 is a diagram showing common contents of memories of a unit 1 and a unit 2;

FIG. 16 is a diagram showing a common main program and a module group in the memories of the unit 1 and the unit 2;

FIG. 17 is a diagram showing a common main program and a module group in the memories of the unit 1 and the unit 2;

FIG. 18 is a diagram showing contents of a memory of a unit 3;

FIG. 19 is a diagram showing contents of a memory of a unit 4;

FIG. 20 is a diagram showing common contents of memories of a unit 3 and a unit 4;

FIG. 21 is a diagram showing a common main program and a group of modules in memories of units 3 and 4.

FIG. 22 is a diagram showing a common main program and a module group in the memories of the units 3 and 4.

FIG. 23 is a diagram showing the contents of the memory after updating of the unit 1;

FIG. 24 is a diagram showing the contents of the memory after updating of the unit 2;

FIG. 25 is a diagram showing a configuration of a system in which a plurality of units are connected according to a conventional technique.

[Explanation of symbols]

1, 2, 3, 4 unit 11 bus 12 analog signal line 13 connection box 21, 23, 25, 27 operating program storage area 22, 24, 26, 28 all unit program storage area (updated program storage area) 31 CPU 32 memory 33 amplifier 34 communications circuitry 35 monitors 35a play status display portion 35b manipulation menu display section 36 function controller 37 operation panel 39 speaker 41 flash memory 42 mask ROM 43 E ² PROM 44 RAM 45 mask ROM 51, 52, 53 unit 54 bus 55 analog Signal line 61 operating program storage area 62 generation storage area 63 update program storage area 64 accommodation generation storage area 65 comparing means 66 transmitting means 67 updating means 68 initial operation program storage area 69 normal end detection Means 70 operating program initialization means

Claims (8)

[Claims] A generation storage area for storing a generation indicating a development time or a sales time of the own unit device; an operation program storage area for storing an operation program for operating the own unit device; An update storage area for storing an update for a new generation for operating another unit of the old generation, and when the generation of the own unit is newer than the generation of the connected other unit. Transmission means for transmitting, to the other unit device, a new-generation-compatible update program for operating the other unit device stored in the update program storage area. 2. A generation storage area for storing a generation indicating a development time or a sales time of the own unit apparatus, an operation program storage area for storing an operation program for operating the own unit apparatus, and an own unit apparatus And updating means for storing and updating an update program corresponding to the new generation transmitted from the other unit device in the operation program storage area when the generation is older than the generation of the connected other unit device. A unit device comprising: 3. A unit device capable of updating an operation program inside a unit device to a new generation compatible one when unit devices of different generations indicating a development time or a sales time are connected to each other. A generation storage area for storing the generation of a unit device, an operation program storage area for storing an operation program for operating its own unit device, and a new storage device for operating another unit device of a generation older than its own generation. When an update program storage area for storing an update program corresponding to a generation and another unit device are connected, the generation information of the other unit device transmitted from the other unit device is stored in the generation storage region. Comparing means for comparing the generation of the own unit device with the generation of the own unit device. Transmitting means for transmitting, to the other unit device, an update program corresponding to a new generation for operating the another unit device stored in the update program storage area when the newer device is newer than the generation of the other unit device. As a result of the comparison by the comparing means, when the generation of the own unit is older than the generation of the other unit, the update program corresponding to the new generation transmitted from the other unit is stored in the operation program. Updating means for storing the information in an area and updating the area. 4. An initial operation program storage area for storing the same operation program as an operation program initially stored in the operation program storage area, and a normal state for detecting whether or not the updating means has normally completed the update processing. An end detecting means for storing the operation program stored in the initial operation program storage area in the operation program storage area when the update processing has not been normally completed, and initializing the operation program in the operation program storage area; 4. The unit device according to claim 3, further comprising an operation program initializing means for returning to the current state. 5. A unit device capable of updating an operation program in a unit device to a new generation-compatible one when unit devices having different generations indicating a development time or a sales time are connected to each other. A generation storage area for storing the generation of a unit device, an operation program storage area for storing an operation program for operating its own unit device, and a new storage device for operating another unit device of a generation older than its own generation. An update program storage area for storing an update program corresponding to a generation; an accommodation generation storage area for storing the generation of the update program stored in the update program storage area; The generation information of the other unit device transmitted from the unit device and its own unit stored in the generation storage area. A comparison unit that compares the generation of the unit device with the update program storage area when the result of the comparison by the comparison unit indicates that the generation of the own unit device is newer than the generation of the other unit device. A transmission unit for transmitting the update program corresponding to the new generation for operating the other unit device and the generation information stored in the accommodated generation storage area to the other unit device, a result of the comparison by the comparing unit, When the generation of the own unit is older than the generation of the other unit, the update program corresponding to the new generation transmitted from the other unit and the generation information of the update are stored in the operation program storage area and the operation program storage area. Updating means for updating an update program and a generation by storing them in a generation storage area apparatus. 6. A unit device control system for updating an operation program in a unit device to a new generation compatible device when first and second unit devices having different generations indicating a development time or a sales time are connected to each other. The first unit has a generation storage area for storing the generation of its own unit apparatus, an operation program storage area for storing an operation program for operating its own unit apparatus, An update program storage area for storing an update program corresponding to the new generation for operating the unit device of the old generation; and the update program when the generation of the own unit device is newer than the generation of the second unit device. Transmitting means for transmitting the new generation-compatible update program stored in the storage area to the second unit device; The second unit has a generation storage area for storing the generation of the own unit, an operation program storage for storing an operation program for operating the own unit, Updating means for storing an update program corresponding to a new generation transmitted from the first unit device in the operation program storage area and updating when the generation is older than the generation of the first unit device. A unit device control system, characterized in that: 7. A unit device control method for updating an operation program inside a unit device to a new generation compatible one when unit devices of different generations indicating a development time or a sales time are connected to each other. When the generation of the device is newer than the generation of the connected other unit device, transmitting an update program corresponding to a new generation for operating the another unit device to the other unit device; When the generation of the unit device is older than the generation of the other connected unit device, storing the update program corresponding to the new generation transmitted from the other unit device in its own unit device and updating the same. A method for controlling a unit device, comprising: 8. A recording medium recording a computer program for updating an operation program in a unit device to a new generation-compatible one when unit devices having different generations indicating a development time or a sales time are connected to each other, A step of transmitting an update program corresponding to a new generation for operating the other unit device to the other unit device when the generation of the own unit device is newer than the generation of the other connected unit device; When the generation of the own unit is older than the generation of the connected other unit, the update program corresponding to the new generation transmitted from the other unit is stored and updated in the own unit. And a computer-readable recording medium on which a program for causing a computer to execute the steps is recorded.