JP4072504B2 - Program rewriting method and system - Google Patents

Description

The present invention relates to an electronic device and a program rewrite system.

Conventionally, as a method of rewriting a program stored and stored in a mobile phone and used for operation control of the mobile phone, a program stored and held in an external device is stored in the mobile phone via a serial interface of the mobile phone. There are a method of inputting and writing (for example, see Patent Document 1) and a method of inputting and writing a program stored and held in a memory card via a connection terminal with the memory card (for example, see Patent Document 2).
JP-A-5-327582 (Claim 1, pages 2-4) JP 2002-44738 A (Claim 1)

  However, the program transfer via the serial interface as described in Patent Document 1 has a problem that it takes time to rewrite the program because the processing speed is slow.

  On the other hand, when writing a program from a memory card as in the technique of Patent Document 2, the capacity of a rewritable program is limited to the storage capacity of the memory card, and a large-capacity program cannot be written. There's a problem.

The present invention has been made in order to solve the above-described problems, shortens the time required for rewriting a program of a mobile phone or other electronic device, and can rewrite a program having a larger capacity than before. and to provide a that electronic equipment and program rewriting system to the.

Electronic device of the present invention includes a serial communication terminal for serial communications, and the external memory connecting terminal external memory is connected, and a memory for storing programs that stores a program, an electronic apparatus comprising a memory for storing the program Rewriting control means for executing a rewriting process that is a process for rewriting the stored program is provided, and the rewriting process has a data amount corresponding to the storage capacity of the external memory and is stored in the external memory. The rewrite program is input to the electronic device from the external memory via the external memory connection terminal, and a part of the program stored in the program storage memory by the input first rewrite program is First control for rewriting and second rewriting for storing a second rewriting program A second control for rewriting another part of the program stored in the program storage memory by a second rewriting program input to the electronic device from the program storage device via the serial communication terminal; It is determined whether or not the first rewriting program of the type notified from the second rewriting program storage device is stored in the external memory, and if it is stored, that fact is indicated in the second rewriting program. A third control for notifying the program storage device, and a fourth control for notifying the second rewrite program storage device that the first control has been completed. The type of the first rewrite program stored in the program storage memory is changed from the second rewrite program storage device to the electronic The third control is executed, and after the third control is executed, the first rewrite program is stored in any storage area of the program storage memory. When the electronic device is notified from the second rewriting program storage device, the first control is executed, and in the first control, the first rewriting program is transferred to the first rewriting program. When the first control is completed, the fourth control is performed by rewriting a part of the program stored in the program storage memory. After executing the fourth control, the second rewriting program is stored in the storage area of the program storage memory. When the electronic device is notified from the rewriting program and the second rewriting program is input to the electronic device via the serial communication terminal, the second control is executed, and the second In the control, the second rewriting program is stored in the area notified from the second rewriting program storage device, thereby rewriting another part of the program stored in the program storing memory. Thus, the second rewriting program is stored in the program storage memory subsequent to storing the first rewriting program in the program storage memory .

In the electronic apparatus of the present invention, the rewrite control means, from said second rewriting program storage device before Symbol state in which the second rewriting program storage device is connected to the serial communication terminal to the electronic device Preferably, the rewriting process is performed when the second rewriting program is transferred .

  The electronic device of the present invention is preferably a mobile phone or other portable information terminal device, for example.

The program rewriting system of the present invention includes an electronic device including a serial communication terminal for serial communication, an external memory connection terminal, a program storage memory storing a program, and an external memory connected to the external memory connection terminal And the second rewrite program storage device connected to the serial communication terminal, and the external memory has a first rewrite program having a data amount corresponding to the storage capacity of the external memory. The second rewriting program storage device stores a second rewriting program, and the electronic device executes a rewriting process that is a process of rewriting the program stored in the program storage memory. Rewriting control means for performing the rewriting process in the first rewriting program. Is input from the external memory to the electronic device via the external memory connection terminal, and the first control for rewriting a part of the program stored in the program storage memory by the input first rewriting program And another part of the program stored in the program storage memory by the second rewrite program input to the electronic device from the second rewrite program storage device via the serial communication terminal And the second control for rewriting and determining whether the first rewriting program of the type notified from the second rewriting program storage device is stored in the external memory, and if it is stored, The third control for notifying the second rewrite program storage device of the fact, and the fact that the first control is finished And a fourth control to be notified to the rewrite program storage device, wherein the rewrite control means is configured such that the type of the first rewrite program stored in the program storage memory is the second rewrite. When notified from the electronic program storage device to the electronic device, the third control is executed, and when the second rewrite program storage device receives the notification by the third control from the electronic device, The electronic device is notified of in which storage area of the program storage memory the first rewriting program should be stored, and the rewriting control means stores the first rewriting program. Which area should be stored in the storage area of the program storage memory from the second rewrite program storage device to the electronic When notified to the device, the first control is executed, and in the first control, the first rewriting program is stored in the area notified from the second rewriting program storage device. The part of the program stored in the program storage memory is rewritten, and when the first control is completed, the fourth control is executed, and the second rewrite program storage device is When the notification by the control of 4 is received from the electronic device, the electronic device is notified of in which storage area of the memory for storing the program the second rewriting program should be stored, The second rewriting program is input to the electronic device via the serial communication terminal, and the rewriting control means is configured to execute the second rewriting program before the second rewriting program. When input to the electronic device via a serial communication terminal, the second control is executed, and in the second control, the second rewriting program is notified from the second rewriting program storage device. Storing the first rewriting program in the program storing memory by rewriting the other part of the program stored in the program storing memory by storing in the program storing memory Subsequently, the second rewriting program is stored in the program storage memory .

In the program rewriting system of the present invention, the rewrite control means transfers the second rewrite program storage device from the second rewrite program storage device to the electronic device in a state where the second rewrite program storage device is connected to the serial communication terminal. Preferably, the rewriting process is performed when the second rewriting program is transferred .

According to the present invention, the first rewrite program is input to the electronic device via the external memory connection terminal and stored in the program storage memory, while the second rewrite program is stored in the electronic device via the serial communication terminal. Fill in than that stores in a memory for program storage, the time required for rewriting the program that is eliminated that depends only on the serial communication speed. For this reason, compared with the case where the whole program to be rewritten is written via the serial communication terminal (Patent Document 1), the time required for writing can be shortened. In addition, it is possible to write a large-capacity program as compared with the case where the program is input and written only from the external memory (Patent Document 2).

  That is, according to the present invention, it is possible to reduce the time required for rewriting the program of the electronic device as compared with the conventional case, and it is possible to rewrite the program with a larger capacity than before.

  It should be noted that the present invention can be applied to, for example, rewriting a program at the time of program version upgrade when developing a program for an electronic device. In this case, the program development efficiency can be improved by applying the present invention to shorten the program rewriting time.

  Alternatively, for example, the present invention can be applied to program rewriting when updating the program when the electronic device is collected due to the occurrence of a field failure after shipment. In this case as well, the update can be performed quickly. Become.

  Embodiments according to the present invention will be described below with reference to the drawings.

  In the present embodiment, a mobile phone, a program rewriting system, a program rewriting method, a program rewriting program, and a storage medium will be described as a preferred example of an electronic apparatus according to the present invention.

[First Embodiment]
As shown in FIG. 1, a program rewriting system 1 according to the first embodiment includes a mobile phone (electronic device, portable information terminal device) 10 and a rewriting device (second device) that is connected to the mobile phone 10 and rewrites a program. , A reprogramming device 17 and a serial communication cable (for example, RS-232C cable) 20 that interconnects the rewriting device 17 and the mobile phone 10 so as to enable serial communication, and an external device connected to the mobile phone 10. And a memory 14.

  Among these, the mobile phone 10 is a program storage memory (storage medium; for example, flash memory) 15 for storing a control program for the mobile phone 10 and a work area for executing the program in the program storage memory 15. A functioning RAM 16, a CPU (which also functions as a rewrite control means as will be described later) 11 that operates according to a program in the program storage memory 15 and performs overall control of the mobile phone 10, and an interface for serial communication controlled by the CPU 11 And an external memory interface 13 controlled by the CPU 11 and functioning as an interface between the external memory 14 (described later).

  The external memory interface 13 includes a connector (external memory connection terminal) 13 a for connection to the external memory 14.

  The serial interface 12 includes a serial communication terminal 12a to which a serial communication cable 20 is connected. By connecting one end of the serial communication cable 20 to the serial communication terminal 12 a and connecting the other end of the serial communication cable 20 to the rewriting device 17, serial communication can be performed between the rewriting device 17 and the mobile phone 10. It becomes possible.

  The external memory 14 stores and stores (stores) a program (hereinafter referred to as a first rewrite program) 19 that is newly written in the program storage memory 15 of the mobile phone 10. The external memory 14 is, for example, a memory card. In this case, the external memory 14 is connected to the mobile phone 10 by being inserted into the connector 13 a of the external memory interface 13 of the mobile phone 10. The first rewriting program 19 preferably has a data amount corresponding to the storage capacity of the external memory 14.

  The rewriting device 17 is a device for rewriting a program in the program storage memory 15 of the mobile phone 10 and is composed of, for example, a personal computer. The rewriting device 17 includes, for example, a CPU 17a, a RAM 17b, and a memory (storage medium; for example, a ROM) 21, and a program (newly written in the program storage memory 15 of the mobile phone 10) is stored in the memory 21. Hereinafter, the second rewriting program) 18 is stored (stored). The memory 21 also stores a program for controlling the operation of the rewriting device 17 itself, and the CPU 17a executes the program to control the operation of the rewriting device 17 and the program rewriting of the mobile phone 10. At this time, control (part of a program rewriting process described later) is performed.

  Specifically, the rewriting device 17 transfers the second rewriting program in the memory 21 to the mobile phone 10 or rewrites a required command to the mobile phone 10 when rewriting the program of the mobile phone 10. Or send.

  Note that the second rewriting program 18 stored in the rewriting device 17 and the first rewriting program 19 stored in the external memory 14 complement each other after, for example, writing to the mobile phone 10. Thus, one program may be configured, or a separate program may be used.

  As shown in FIG. 2, the program storage memory 15 of the mobile phone 10 includes an application program storage area 15a and a program rewrite processing program storage area 15b.

  Here, the application program stored and held in the application program storage area 15a is a main program for controlling the mobile phone 10, and a part or all of the main program is rewritten to another program as will be described later.

  The program rewrite processing program (program) stored and held in the program rewrite program storage area 15 b is a program used to control the mobile phone 10 when the application program of the mobile phone 10 is rewritten. When the CPU 11 of the mobile phone 10 executes this program rewriting program, a part of the program rewriting process described later is performed.

  Next, the operation will be described with reference to the flowchart of FIG.

  FIG. 3 shows a program rewriting process that the mobile phone 10 and the rewriting device 17 cooperatively execute during program rewriting.

  In this program rewriting process, the CPU 11 of the mobile phone 10 functions as a rewrite control means.

  Here, as a start trigger of a series of program rewriting processes described below, for example, the following examples are given.

  That is, the program rewriting process can be started, for example, with a command from the rewriting device 17 as a trigger. Furthermore, for example, this command is transmitted from the rewriting device 17 to the mobile phone 10 as a trigger for a required operation on an operation unit (not shown; configured by a keyboard and a mouse, for example) of the rewriting device 17.

  In addition, for example, a required operation using an operation unit (not shown; constituted by operation keys, for example) of the mobile phone 10 may be used as a start trigger. Alternatively, the processing may be started when the CPU 11 determines that the external memory 14 stores a program to be rewritten when the external memory 14 is connected to the connector 13a. In this case, for example, when the external memory 14 is a memory card, identification information (identification information indicating that the program to be rewritten is stored) supplied from the memory card is used. To do.

  For example, when any of these start triggers occurs, the CPU 11 of the mobile phone 10 fetches the program rewriting program from the program rewriting program storage area 15b in the program storing memory 15, and the program rewriting program Is activated (step S1). The operation of the CPU 11 described below is an operation according to this program rewriting program.

  Next, the CPU 11 determines whether or not the external memory 14 is connected to the connector 13a of the external memory interface 13 (step S2). Here, if not connected (NO in step S2), the processing in FIG. 3 is terminated.

  On the other hand, when the external memory 14 is connected to the connector 13a (YES in step S2), the rewriting device 17 is notified that the program rewriting program has been started (in other words, the program rewriting process is executed). (Step S3).

  In the following description, notification and data transmission (transfer) between the mobile phone 10 and the rewriting device 17 are all serial communication via the serial interface 12, the serial communication terminal 12a, and the serial communication cable 20. Is made by

  The CPU 17a of the rewriting device 17 that has received the notification of program activation from the mobile phone 10 specifies the type of program to be written in the program storage memory 15 of the mobile phone 10 from the external memory 14 side, and notifies the mobile phone 10 (Step S4).

  Here, the designation of the type of program may be made based on an operator's operation using information on the type of the mobile phone 10, or the mobile phone obtained from the mobile phone 10 side by serial communication. The determination may be made by the CPU 17a of the rewriting device 17 using information on the ten types (model number and the like).

  Next, the CPU 11 of the mobile phone 10 that has received the notification of the program type determines whether or not the notified (that is, designated) type of program is stored in the external memory 14 (step S5). Here, if it is not stored (NO in step S5), the processing in FIG. 3 is terminated. This determination (NO in step S5) is made when the first rewriting program 19 is not stored in the external memory 14 or when the first rewriting is different from the program specified by the rewriting device 17. This is a case where the program 19 is stored. In this case, for example, the above processing is performed from the beginning after the external memory 14 is replaced with a correct one (a program storing a specified type of program).

  On the other hand, when the designated type of program is stored in the external memory 14 (YES in step S5), the CPU 11 notifies the rewriting device 17 that the program is stored (step S6).

  Upon receiving this notification, the CPU 17a of the rewriting device 17 designates a first area in which the first rewriting program 19 is to be stored, among the storage areas (storage areas) of the program storing memory 15 of the mobile phone 10, The mobile phone 10 is notified (step S7). Here, the first area is a part of the application program storage area 15a.

Next, upon receiving this notification, the CPU 11 of the mobile phone 10 stores the first rewriting program 19 in the external memory 14 in the first area designated and notified by the rewriting device 17 (step S8 ). . That is, the original program stored in the first area is rewritten to the first rewriting program 19.

  When the storage of the first rewrite program 19 is thus completed, the CPU 11 notifies the rewriting device 17 that the storage has been completed (step S9).

  Upon receiving this notification, the CPU 17a of the rewriting device 17 designates the type of the program (second rewriting program 18) to be written in the program storage memory 15 of the mobile phone 10 from the rewriting device 17 side. Of the storage area of the program storage memory 15 of the telephone 10, a second area in which the second rewriting program 18 is to be stored is designated, and both of the designated information are notified to the mobile telephone 10 (step S10). ).

  The designation of the type of program here may be made based on the operator's operation using information (model number or the like) regarding the type of mobile phone 10 as in the case of step S4 above, or serial The determination may be made by the CPU 17a of the rewriting device 17 using information on the type of the mobile phone 10 obtained from the mobile phone 10 side by communication.

  The second area is a part of the application program storage area 15a and is a different area from the first area.

  As described above, the CPU 11 of the mobile phone 10 that has received the notification of the type of the second rewriting program 18 and the second area that is the storage location notifies the rewriting device 17 that the information has been recognized. (Step S11).

  Upon receiving this notification, the CPU 17a of the rewriting device 17 transfers the second rewriting program 18 designated in the previous step S10 to the mobile phone 10 (step S12).

On the other hand, the CPU 11 of the mobile phone 10 stores the second rewriting program 18 thus transferred from the rewriting device 17 in the second area of the application program storage area 15a of the program storage memory 15 (step S1 3 ) That is, the original program stored in the second area is rewritten to the second rewriting program 18.

  Thus, the programs (in the first and second areas) in the application program storage area 15a of the program storage memory 15 are rewritten into the first and second rewriting programs 18 and 19.

According to the first embodiment as described above, the first rewriting program 19 is input to the mobile phone 10 via the external memory connection terminal 13a and the external memory interface 13, and the first rewriting program 19 is programmed. that stores in the storage memory 15 in (step S8) while the serial communication terminals 12a and the serial interface 12 and the second rewriting program 18 via the input to the cellular phone 10 programs the second rewrite program 18 that stores in the storage memory 15 (step S13) of the time required for rewriting the program that is eliminated that depends only on the serial communication speed. That is, the influence of the time required for serial communication can be reduced by step S8 . For this reason, compared with the case where all the programs which should be rewritten are written via the serial communication terminal 12a (patent document 1), the time required for writing can be shortened. Moreover, it is possible to write a large-capacity program as compared with the case where the program is input and written only from the external memory 14 (Patent Document 2). That is, according to the present invention, it is possible to shorten the time required for program rewriting and to enable large-capacity program rewriting as compared with the prior art.

Further, since the step S1 3 Following the step S 8, that is, the step S8 and step S13 is performed in substantially the timing which is substantially continuous, it is possible to more reliably reduce the program rewriting time.

  Further, by making the first rewriting program a program having a data amount corresponding to the storage capacity of the external memory 14, the time required for serial communication can be shortened as much as possible, and the program rewriting time can be further shortened. it can.

  Of the storage areas of the application program storage area 15a of the program storage memory 15, the first area in which the first rewriting program 19 is stored and the second area in which the second rewriting program 18 is stored. Since the area is designated by the rewriting device 17, both programs 18 and 19 can be reliably written in the application program storage area 15 a. Therefore, for example, there is no case where the first rewriting program 19 is mistakenly overwritten with the second rewriting program 18 and the program is not lost.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIG.

  In FIG. 4, steps similar to those in FIG. 3 described in the first embodiment are denoted by the same reference numerals.

In the first embodiment described above has described the example in which the steps S1 3 Following the step S 8, in the second embodiment, an example to reverse the order of these steps.

That is, in the case of the second embodiment, as shown in FIG. 4, performs the steps S 8 Following step S1 3.

  In addition, with such a change in the order of the steps, there are some other changes as described below.

  That is, in the case of the second embodiment, as shown in FIG. 4, the process proceeds from step S1 → step S2 → step S3 in the same manner as in the first embodiment, but following step S3, step S10 is performed. Perform the process.

  After step S10, the process proceeds in the order of step S10 → step S11 → step S12 → step S13, as in the first embodiment. Furthermore, step S21 is performed following step S13.

  In this step S21, the CPU 11 notifies the rewriting device 17 that the storage of the second rewriting program 18 in the previous step S13 has been completed.

  Following step S21, the process of step S4 is performed. After step S4, as in the first embodiment, the process proceeds from step S4 → step S5 → step S6 → step S7 → step S8, and the program rewriting process is terminated.

  According to the second embodiment as described above, the same effect as in the first embodiment can be obtained.

  In each of the above embodiments, a mobile phone is illustrated as an electronic apparatus according to the present invention. However, the present invention is not limited to this example, and for example, PHS (Personal Handy Phone System), PDA (Personal Digital Assistant) or The present invention can be similarly applied to other portable information terminal devices other than mobile phones. Furthermore, the present invention is not limited to these portable information terminal devices, but can be similarly applied to other electronic devices.

Further, as the program storage memory 15, a memory having a plurality of individually writable memory areas (storage areas) is used, and step S8 and step S13 may be performed in parallel (in time series). In this case, the rewriting time can be further shortened.

  In addition, the program rewriting process described in each of the above embodiments may be simplified by omitting some processes as follows.

  That is, in both cases of the first and second embodiments described above (in either case of FIGS. 3 and 4), step S12 is executed following step S10, and step S11 is omitted. In this way, the program rewriting process can be simplified and the processing time can be further shortened.

  In the above embodiment, the memory card is illustrated as an example of the external memory 14, but the present invention is not limited to this example. That is, the external memory 14 may be, for example, a hard disk drive or other storage device. In this case, for example, the external memory interface 13 is replaced with a USB interface, the external memory interface 13 and the storage device are connected via a USB cable, and the second from the storage device to the electronic device (for example, the mobile phone 10). The rewriting program 18 may be transferred.

1 is a block diagram showing a program rewriting system according to a first embodiment of the present invention. It is a figure which shows the memory content of the program storage memory with which the mobile telephone of the program rewriting system of FIG. It is a flowchart which shows the flow of the program rewriting process in the case of 1st Embodiment. It is a flowchart which shows the flow of the program rewriting process in the case of 2nd Embodiment.

Explanation of symbols

1 Program rewriting system 10 Mobile phone (electronic equipment)
11 CPU (rewrite control means)
12a Serial communication terminal 13a Connector (external memory connection terminal)
14 External memory 15 Program storage memory (storage medium)
17 Rewriting device (second rewriting program storage device)
21 Memory (storage medium)
19 First rewriting program 18 Second rewriting program

Claims (6)

In an electronic device comprising a serial communication terminal for serial communication, an external memory connection terminal to which an external memory is connected, and a program storage memory storing a program,
  Rewriting control means for executing a rewriting process that is a process of rewriting the program stored in the program storage memory;
  For the rewriting process,
  A first rewriting program having a data amount corresponding to the storage capacity of the external memory and stored in the external memory is input from the external memory to the electronic device via the external memory connection terminal. First control for rewriting a part of the program stored in the program storage memory by the first rewriting program,
  The second rewrite program input from the second rewrite program storage device storing the second rewrite program to the electronic device via the serial communication terminal stores the program stored in the program storage memory. A second control for rewriting another part of the program;
  It is determined whether or not the first rewriting program of the type notified from the second rewriting program storage device is stored in the external memory, and if it is stored, that fact is indicated in the second rewriting program. A third control to notify the program storage device;
  A fourth control for notifying the second rewrite program storage device that the control of 1 has been completed;
  Contains
  The rewrite control means includes
  When the second rewrite program storage device is notified of the type of the first rewrite program stored in the program storage memory from the second rewrite program storage device, the third control is executed,
  After executing the third control, it is determined from the second rewrite program storage device to which electronic device the second rewrite program storage device should store the first rewrite program. Is notified, the first control is executed, and in the first control, the first rewriting program is stored in the area notified from the second rewriting program storage device. By rewriting a part of the program stored in the program storage memory,
  When the first control ends, the fourth control is executed,
  After executing the fourth control, the second rewriting program stores the second rewriting program in the storage area of the program storage memory from the second rewriting program to the electronic device. The second rewriting program is input to the electronic device via the serial communication terminal, the second control is executed. In the second control, the second rewriting program is executed. By storing the program in the area notified from the second rewrite program storage device, rewriting another part of the program stored in the program storage memory,
  An electronic apparatus comprising: storing the second rewrite program in the program storage memory subsequent to storing the first rewrite program in the program storage memory. The rewrite control means transfers the second rewrite program from the second rewrite program storage device to the electronic device in a state where the second rewrite program storage device is connected to the serial communication terminal. The electronic device according to claim 1, wherein the rewriting control is performed when the electronic device is operated. The electronic apparatus according to claim 1, wherein the electronic apparatus is a portable information terminal device. The electronic device according to claim 3, wherein the electronic device is a mobile phone. An electronic device comprising a serial communication terminal for serial communication, an external memory connection terminal, and a program storage memory storing a program;
  An external memory connected to the external memory connection terminal;
  The second rewrite program storage device connected to the serial communication terminal;
  With
  The external memory stores a first rewriting program having a data amount corresponding to the storage capacity of the external memory,
  The second rewrite program storage device stores a second rewrite program,
  The electronic device includes a rewrite control unit that executes a rewrite process that is a process of rewriting the program stored in the program storage memory,
  For the rewriting process,
  The first rewriting program is input from the external memory to the electronic device via the external memory connection terminal, and the program stored in the program storage memory by the input first rewriting program is input. A first control to rewrite the part;
  Another part of the program stored in the program storage memory is rewritten by a second rewriting program input to the electronic device from the second rewriting program storage device via the serial communication terminal. A second control;
  It is determined whether or not the first rewriting program of the type notified from the second rewriting program storage device is stored in the external memory, and if it is stored, that fact is indicated in the second rewriting program. A third control to notify the program storage device;
  A fourth control for notifying the second rewrite program storage device that the control of 1 has been completed;
  Contains
  The rewrite control means executes the third control when the electronic device is notified of the type of the first rewrite program stored in the program storage memory from the second rewrite program storage device. And
  When the second rewrite program storage device receives the notification by the third control from the electronic device, the second rewrite program storage device stores the first rewrite program in any storage area of the program storage memory. To notify the electronic device whether it should be
  The rewrite control means is notified from the second rewrite program storage device to the electronic device which area of the storage area of the program storage memory the first rewrite program should be stored in. The first control is executed, and in the first control, the first rewrite program is stored in the area notified from the second rewrite program storage device, thereby the program storage memory. Rewriting the part of the program stored in the program, and when the first control is completed, execute the fourth control,
  When the second rewrite program storage device receives the notification by the fourth control from the electronic device, the second rewrite program storage device stores the second rewrite program in any storage area of the program storage memory. The electronic device is notified whether the second rewriting program is input to the electronic device via the serial communication terminal,
  The rewrite control means executes the second control when the second rewrite program is input to the electronic device via the serial communication terminal, and in the second control, the second rewrite control unit executes the second control. By storing the rewrite program in the area notified from the second rewrite program storage device, and rewriting the other part of the program stored in the program storage memory,
  A program rewriting system, wherein the second rewriting program is stored in the program storing memory subsequent to storing the first rewriting program in the program storing memory. The rewrite control means transfers the second rewrite program from the second rewrite program storage device to the electronic device in a state where the second rewrite program storage device is connected to the serial communication terminal. 6. The program rewriting system according to claim 5, wherein the rewriting control is performed when the rewriting is performed.

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