JP4288424B2 - Program writing system - Google Patents

Description

  The present invention relates to a program writing system for writing a program to a microcomputer of an electric device.

  FIG. 3 is a schematic circuit diagram showing a conventional program writing system 300. The program writing system 300 writes program data transmitted from the program transmitting apparatus 302 into a microcomputer (hereinafter referred to as a microcomputer) 314 in the electric device 301. At the time of program writing, since the electric device 301 is in a standby (standby) state, the main power supply circuit 312 is in an off state, and the standby power supply circuit 311 rectifies and smoothes the input voltage and supplies it to the microcomputer 314. The microcomputer 314 executes program writing with the voltage supplied from the standby power supply circuit 311.

  In recent years, power saving of electric devices is required, and a low power consumption mode for reducing power consumption in a standby state is provided in a microcomputer. Accordingly, since it is sufficient for the standby power supply circuit 311 to supply a voltage that allows the microcomputer 314 to operate in the low power consumption mode, the transformer 317 of the standby power supply circuit 311 is considerably downsized. However, when writing a program to the microcomputer 314, a large voltage is required for the microcomputer 314, and the standby power supply circuit 311 having the miniaturized transformer 317 cannot supply a voltage necessary for writing the program to the microcomputer 314. Occurs.

  In order to solve this problem, there has been proposed a method of supplying a voltage to the microcomputer 314 by connecting an external power supply circuit to the electric device 301 when writing a program to the microcomputer 314. However, in this method, it is necessary to provide a dedicated connector in the electric device 301, which increases the cost. Furthermore, since it is necessary to connect a dedicated connector to an external power supply circuit, the number of work steps increases.

  Further, a method has been proposed in which the main power supply circuit 312 is turned on and a voltage from the main power supply circuit 312 is supplied to the microcomputer 314 during program writing. In this case, since the electric device 301 is in the standby state and the microcomputer 314 is in the low power consumption mode, the microcomputer 314 turns on the transistor 325 (turns on the relay switch 324A) and turns on the main power supply circuit 312. A signal for control cannot be output from the main power control terminal b. That is, since the microcomputer 314 performs an operation based on the stored program, the operation cannot be performed when the program is written. Therefore, the main power supply circuit 312 is turned on (with the relay switch 324 turned on) by connecting the mechanical switch in parallel to the transistor 325 and turning the mechanical switch on by the operator's manual operation. A method has been proposed in which the voltage from the main power supply circuit 312 is supplied to the microcomputer 314. However, this method has a problem that it is necessary to provide a mechanical switch, which increases the cost, and the number of work steps increases because the switch is manually turned on.

  In addition, a method has been proposed in which the main power supply circuit 312 is turned on by short-circuiting the collector-emitter of the transistor 325 using a short pin, and the voltage from the main power supply circuit is supplied to the microcomputer. In this method, man-hours increase, and the short pin may not be removed after the program writing is completed, and may remain in the electric device by mistake.

JP-A-8-203288

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems. The object of the present invention is to turn on the main power supply circuit at the time of program writing without increasing the man-hours of the operator, and to reduce the voltage from the main power supply circuit. Is to provide a program writing system for supplying a microcomputer to a microcomputer.

  A program writing system according to a preferred embodiment of the present invention includes an electric device, a program transmission device that transmits a program to the electric device, and a writing jig connected between the electric device and the program transmission device. Is provided. The electric device includes a control unit capable of rewriting a program, a main circuit supplied with an input voltage and a main power supply circuit supplying the voltage to the control unit, and a standby power source supplying a voltage to the control unit supplied with the input voltage A circuit, switching means for turning off the main power supply circuit by turning off the switch and turning on the main power supply circuit by turning on the switch, and the writing jig. First connecting means. The writing jig has second connection means connected to the first connection means. When the first connection means and the second connection means are connected, the program writing system supplies a voltage from the standby power supply circuit to the switching means to turn on the switch. And a main power control means.

  When the electrical device is connected to the writing jig (the first connecting means is connected to the second connecting means), a voltage is supplied from the standby power supply circuit to the switching means, and the switch of the switching means (for example, a relay switch) Turns on. When the switch is turned on, the main power supply circuit is turned on, so that the voltage from the main power supply circuit can be supplied to the control means. The control means receives the voltage from the main power supply circuit and executes program writing. Since the writing jig is always connected to the program transmission device during the program writing operation, the operator simply turns on the main power supply circuit by simply connecting an electrical device to the writing jig. can do. That is, since it is only connected via the writing jig, the number of work steps does not increase compared to the case of FIG. Therefore, the main power supply circuit can be turned on at the time of program writing without increasing the number of work steps. In addition, no mechanical switch or short pin is used in the electrical equipment to turn on the main power circuit, so the operator forgets to turn off the mechanical switch or removes the short pin. There is no problem of forgetting. Furthermore, since it is not necessary to provide a mechanical switch in the electric device, the cost does not increase. Furthermore, since no external power supply circuit is used to turn on the main power supply circuit, there is no need to provide a dedicated connector. Therefore, the cost does not increase and the number of work steps does not increase.

  In a preferred embodiment, the switching means includes a transistor for controlling on / off of the switch. The main power supply control means includes a first voltage supply terminal and a first switching control terminal included in the first connection means, and a second voltage supply terminal and a second switch included in the second connection means. It has a control terminal. The first voltage supply terminal is connected to outputs of the standby power supply circuit and the main power supply circuit, the first switching control terminal is connected to a control electrode of the transistor, and the second voltage supply terminal is The second switching control terminal is connected. The main power supply control means connects the first voltage supply terminal and the second voltage supply terminal, and connects the first switch control terminal and the second switch control terminal. The voltage from the standby power supply circuit is supplied to the switching means.

  By connecting the first voltage supply terminal and the second voltage supply terminal and connecting the first switch control terminal and the second switch control terminal, the first voltage supply terminal and the first voltage supply terminal are connected to each other. The switching control terminal is short-circuited. Since the first voltage supply terminal is connected to the output of the standby power supply circuit and the first switching control terminal is connected to the control electrode of the transistor, the voltage from the standby power supply circuit is supplied to the control electrode of the transistor. When a voltage is supplied to the control electrode, the transistor is turned on, the switch (relay switch) is turned on, and the main power supply circuit can be turned on. Therefore, the main power supply circuit can be turned on by connecting the first connecting means and the second connecting means.

  In a preferred embodiment, the writing jig further includes third connection means connected to the program transmission device, and the program transmission device includes a fourth connection means connected to the third connection means. It has a connection means.

  Since the writing jig has the third connecting means, and the program transmitting apparatus has the fourth connecting means, the writing jig can be programmed as needed (corresponding to the electric device for writing the program). Can be connected to or disconnected from the transmitter. Therefore, in the case of an electric device that can write a program to the control means only with a voltage from the standby power supply circuit, the writing jig is removed from the program transmission device, and the electric device is directly connected to the program transmission device. Thereby, the program can be written in the control means with the main power supply circuit turned off. Accordingly, when the program can be written into the microcomputer with the voltage from the standby power supply circuit, the main power supply circuit is not turned on, so that useless power consumption can be reduced.

  In another aspect of the present invention, a programmable electric device can be provided. The electrical apparatus includes a first connection means connectable to a writing jig connected to a program transmission device for transmitting a program, a control means capable of rewriting the program, a main circuit supplied with an input voltage, and the control Including a main power supply circuit for supplying voltage to the means, a standby power supply circuit for supplying input voltage to the control means, a switch and a transistor for controlling on / off of the switch, and turning off the switch Switching means for turning off the main power supply circuit and turning on the switch to turn on the main power supply circuit. The first connection means includes a first voltage supply terminal connected to the outputs of the standby power supply circuit and the main power supply circuit, and a second switching control terminal connected to the control electrode of the transistor. When the first connecting means is connected to the writing jig, the electrical apparatus is configured such that the voltage supply terminal and the switching control terminal are short-circuited, and the voltage from the standby power supply circuit is controlled by the transistor. By supplying the electrode, the switch is turned on.

  By connecting the first connecting means and the second connecting means at the time of program writing, the voltage from the standby power supply circuit can be supplied to the switching means and the main power supply circuit can be turned on. Therefore, when the standby power supply circuit cannot supply the voltage for writing the program to the microcomputer, the main power supply circuit can be automatically turned on and the program can be written with the voltage from the main power supply circuit.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these embodiments. FIG. 1 is a schematic circuit diagram for explaining a program writing system 100 according to a preferred embodiment of the present invention. The program writing system 100 includes an electric device 1, a program transmission device 2 that transmits a program to the electric device 1, and a writing jig 3. The writing jig 3 is connected to the program transmission device 2, and the main power supply circuit 12 in the electric equipment 1 is turned on by connecting the electric equipment 1 to the writing jig 3 at the time of program writing. can do.

  The electrical device 1 includes a standby power supply circuit 11, a main power supply circuit 12, a microcomputer power supply circuit 13, a control means 14, a switching means 15, and a first connection means 16.

  The standby power supply circuit 11 mainly controls the control means (for example, a microcomputer) 14 and / or a peripheral circuit (for example, a microcomputer 14 not shown) when the standby power supply circuit 12 is in an off state and the standby power supply circuit 11 is in an on state. , A remote control signal receiving circuit, a display circuit, and the like). The standby power supply circuit 11 includes a transformer 17 and a rectifier circuit 18. The transformer 17 has a primary winding connected to a commercial AC power supply (applied with an input AC voltage), and converts the input AC voltage into a predetermined voltage based on the turn ratio between the primary winding and the secondary winding. To the rectifier circuit 18. The rectifier circuit 18 rectifies and smoothes the voltage from the transformer 17 to generate a DC voltage. The rectifier circuit 18 includes a full-wave rectifier circuit D1, a capacitor C1, and a resistor R1.

  The main power supply circuit 12 is a circuit that supplies a voltage to a main circuit (a power supply destination circuit, such as an amplifier circuit) (not shown) and the microcomputer 14. The main power supply circuit 12 includes a transformer 19 and a rectifier circuit 20. The transformer 19 is connected to a commercial AC power source (given an input AC voltage), converts the input AC voltage into a predetermined voltage based on the turns ratio of the primary winding and the secondary winding, and supplies the rectifier circuit 20 with the input AC voltage. give. The rectifier circuit 20 rectifies and smoothes the voltage from the transformer 19 to generate a DC voltage. Rectifier circuit 20 includes a full-wave rectifier circuit D2 and a capacitor C2.

  The microcomputer power supply circuit 13 is a circuit that receives a voltage from the standby power supply circuit 11 and / or the main power supply circuit 12 and applies a voltage to the microcomputer 14. The microcomputer power supply circuit 13 includes diodes D3 and D4 for preventing reverse current, a capacitor C3, and a stabilization circuit 21. The capacitor C3 is charged with a voltage to be supplied to the microcomputer 14. During standby, the voltage is charged in the capacitor C3 only from the standby power supply circuit 11, and during normal operation (when the main power supply circuit 3 is on), the voltage is charged from the standby power supply circuit 11 and the main power supply circuit 12 to the capacitor C3. . The stabilization circuit 21 is supplied with a voltage from the capacitor C3 and generates a stabilized DC voltage necessary for the operation of the microcomputer 14. The output terminal of the stabilization circuit 21 is connected to the voltage input terminal a of the microcomputer 14.

  The control means 14 is supplied with a voltage from the standby power supply circuit 11 and / or the main power supply circuit 12 and controls the entire electric device 1. Typically, a microcomputer can be employed. The microcomputer 14 has a CPU (central processing unit) 22, a flash EEPROM 23, a voltage input terminal a, a main power supply control terminal b, and one or more program write terminals c. The CPU 22 controls each part (main circuit, standby power supply circuit 11, main power supply circuit 12, etc.) of the electric device 1 by executing a program stored in the EEPROM 23. The EEPROM 23 stores a program transmitted from the program transmission device 2 via the writing jig 3. The voltage input terminal a is a terminal to which a voltage necessary for operating the microcomputer 14 from the microcomputer power supply circuit 13 is applied. The main power supply control terminal b is a terminal that outputs a signal for controlling the on / off state of the main power supply circuit 12 (that is, for turning on / off a relay switch 24A described later). The program write terminal c is a terminal to which a program to be written in the EEPROM 23 is supplied.

  The switching means 15 switches the on state and the off state of the main power supply circuit 12. The switching means 15 typically includes a relay circuit 24 and a relay drive transistor 25. Relay circuit 24 includes a relay switch 24A and a winding 24B. The relay switch 24 </ b> A is connected between the commercial AC power supply and the transformer 19. Since the main power supply circuit 12 is connected to the subsequent stage of the relay switch 24A and the standby power supply circuit 11 is connected to the previous stage of the relay switch 24A, when the relay switch 24A is turned off, only the main power supply circuit 12 is turned off. . One end of the winding 24 </ b> B is connected to the output end of the rectifier circuit 18, and the other end is connected to the collector of the transistor 25. The transistor 25 is an element that controls ON / OFF of the relay circuit 24 based on a voltage applied to the base. The transistor 25 has a base (control electrode) connected to a main power supply control terminal b of the microcomputer 14 and a first switching control terminal 16B described later via a resistor R2, and an emitter connected to the ground potential GND.

  The first connecting means 16 is connected to the writing jig 3 (second connecting means 26 described later), and program data is supplied from the program transmitting device 2 via the writing jig 3. Further, the first connection means 16 supplies a voltage to the program transmission device 2 via the writing jig 3. The first connecting means 16 is typically a connector and includes at least a first voltage supply terminal 16A and a first switching control terminal 16B. The first connection means 16 further includes one or a plurality of program input terminals 16C and a ground terminal 16D. The first voltage supply terminal 16A is connected to the output terminal of the stabilization circuit 21 (that is, connected to the output terminals of the standby power supply circuit 11 and the main power supply circuit 12), and is supplied to the microcomputer 14 during program writing. Is also a terminal for supplying to the program transmission device 2. The first switching control terminal 16B is connected to the base of the transistor 25 via the resistor R2. By supplying the voltage from the standby power supply circuit 11 to the base of the transistor 25, the relay circuit 24 is turned on / off. This is the terminal to turn off. The program write terminal 16C is a terminal to which program data is supplied, and an arbitrary one is provided according to the contents of the program. The ground terminal 16D is a terminal connected to the ground potential GND of the electric device 1.

  The writing jig 3 supplies the voltage from the electric device 1 to the program transmission device 2 and supplies the program data from the program transmission device 2 to the electric device 1. The writing jig 3 has second connection means 26 and third connection means 27. The second connection means 26 is connected to the first connection means 16 at the time of program writing. The second connecting means 26 receives the voltage from the first connecting means 16 and outputs program data to the first connecting means 16. The second connection means 26 is typically a connector and includes terminals corresponding to the terminals 16A to 16D of the first connection means 16. That is, the second connection means 26 includes at least a second voltage supply terminal 26A and a second switching control terminal 26B (details will be described later as main power supply control means). The second connection means 26 further includes one or a plurality of program output terminals 26C and a ground terminal 26D. At the time of program writing, the program output terminal 26C is connected to the program input terminal 16C, and the ground terminal 26D is connected to the ground terminal 16D.

  The third connecting means 27 is connected to the program transmitting device 2 at the time of program writing. The third connection unit 27 receives the program data from the program transmission device 2 and outputs the program data to the second connection unit 26. Further, the third connection unit 27 outputs the voltage from the second connection unit 26 to the program transmission device 2. The third connection means 27 is typically a connector, and includes a third voltage supply terminal 27A, one or more program input terminals 27C, and a ground terminal 27D. The third voltage supply terminal 27A is connected to the second voltage supply terminal 26A, the program input terminal 27C is connected to the program output terminal 26C, and the ground terminal 27D is connected to the ground terminal 26D in the writing jig 3.

  The electric device 1 and the writing jig 3 have main power control means. The main power supply control means turns on the relay switch 24A of the switching means 15 without using the signal from the microcomputer 14 (main power supply control terminal b). That is, the main power supply control means supplies the voltage from the standby power supply circuit 11 to the switching means 15 when the first connection means 16 and the second connection means 26 are connected, and turns on the relay switch 24A. By setting the state, the main power supply circuit 12 is controlled to be turned on. The main power supply control means includes a first voltage supply terminal 16A, a first switching control terminal 16B, a second voltage supply terminal 26A, and a second switching control terminal 26B. The second voltage supply terminal 26A and the second switching control terminal 26B are connected inside the writing jig 3. Therefore, when the program is written, the first voltage supply terminal 16A and the second voltage supply terminal 26A are connected, and the first switch control terminal 16B and the second switch control terminal 26B are connected, thereby One voltage supply terminal 16A and the first switching control terminal 16B are short-circuited. That is, the output of the stabilization circuit 21 (standby power supply circuit 11) and the base of the transistor 25 are short-circuited. Accordingly, the voltage from the standby power supply circuit 11 is supplied to the base of the transistor 25.

  The program transmission device 2 transmits program data stored in the RAM 31 of the microcomputer 29 to the electric device 1 through the writing jig 3 and is generally called a flash writer. The program transmission device 2 includes fourth connection means 28. The fourth connection means 28 is connected to the third connection means 27 at the time of program writing. The fourth connection means 28 receives a voltage from the third connection means 27 and outputs program data to the third connection means 27. The fourth connecting means 28 is typically a connector, and includes terminals corresponding to the terminals 27A, 27C, 27D of the third connecting means 27. That is, the fourth connection means 28 includes a fourth voltage input terminal 28A, one or more program output terminals 28C, and a ground terminal 28D. The fourth voltage supply terminal 28A is connected to the third voltage supply terminal 27A, the program output terminal 28C is connected to the program input terminal 27C, and the ground terminal 28D is connected to the ground terminal 27D. The operation unit 32 is for an operator to input an instruction to start transmission of program data, and is an operation button or the like. The CPU 30 in the microcomputer 29 communicates with the CPU 22 of the electric device 1 via the program output terminal 28C at the time of program writing.

  The operation of the program writing system 100 having the above configuration will be described. At the time of program writing, the writing jig 3 is connected to the program transmitting device 2. Therefore, the operator can write the program in the EEPROM 23 of the electrical device 1 by operating the operation unit 32 of the program transmission device 2 after connecting the electrical device 1 in the standby state to the writing jig 3. .

  Before the electrical device 1 is connected to the writing jig 3, the relay switch 24A is in an off state, and the main power supply circuit 12 is in an off state. Here, the first voltage supply terminal 16A is connected to the second voltage supply terminal 26A, and the first switching control terminal 16B is connected to the second switching control terminal 26B (the program input terminal 16C is connected to the program output terminal 26C). And the ground terminal 16D is connected to the ground terminal 26D). Since the second voltage supply terminal 26A and the second switching control terminal 26B are connected in the writing jig 3, the first voltage supply terminal 16A and the first switching control terminal 16B are short-circuited. . Therefore, the output of the standby power supply circuit 11 includes the diode D4, the stabilization circuit 21, the first voltage supply terminal 16A, the second voltage supply terminal 26A, the second switching control terminal 26B, the first switching control terminal 16B, and The resistor R2 is connected to the base of the transistor 25. Accordingly, the voltage from the standby power supply circuit 11 is supplied to the base of the transistor 25. When the voltage from the standby power supply circuit 11 is supplied to the base of the transistor 25, the base-emitter voltage becomes equal to or higher than the conduction start voltage of the transistor 25 and is turned on. When the transistor 25 is turned on, a current flows from the standby power supply circuit 11 to the ground potential GND through the winding 24B of the relay circuit 24 and the transistor 25, and the relay switch 24A is turned on. As a result, the main power supply circuit 12 is turned on, and a voltage is supplied to the microcomputer 14 via the stabilization circuit 21. Accordingly, when the electric device 1 in the standby state is connected to the writing jig 3, the main power supply circuit 12 is automatically turned on, and the microcomputer 14 obtains a voltage necessary for executing the program writing. be able to.

  The voltages from the main power supply circuit 12 and the standby power supply circuit 11 are further passed through the first voltage supply terminal 16A, the second voltage supply terminal 26A, the third voltage supply terminal 27A, and the fourth voltage supply terminal 28A. , And supplied to the program transmission device 2. The program transmission device 2 is operated by the voltage and outputs program data from the program output terminal 28C. The program data is supplied to the program write terminal c of the microcomputer 14 via the program input terminal 27C, the program output terminal 26C, and the program input terminal 16C, and is written in the EEPROM 23.

  Since the voltage is applied to the base of the transistor 25 via the switching control terminal 16B while the electric device 1 is connected to the writing jig 3, the main power supply circuit 12 maintains the on state. On the other hand, when the electric device 1 is removed from the writing jig 3, no voltage is supplied to the base of the transistor 25, so that the current flowing through the winding 24 </ b> B of the relay circuit 24 is interrupted. As a result, the relay switch 24 is turned off, and the main power supply circuit 12 is turned off. As described above, the worker simply connects the electric device 1 to the writing jig 3 and turns on the main power supply circuit 12 without using other work, and uses the voltage from the main power supply circuit 12. Thus, program writing to the microcomputer 14 can be executed. Furthermore, since the main power circuit 12 is turned off when the electric device 1 is removed from the writing jig 3, the main power circuit 1 is turned on in the electric device 1 as in the case of using a short pin. This solves the problem that the device is left unintentionally without being removed.

  Next, the case where the voltage from standby power supply circuit 11 is equal to or higher than the voltage necessary for program writing and the program can be written to microcomputer 14 only by the voltage from standby power supply circuit 11 will be described with reference to FIG. To do. That is, a case where a program is written in the EEPROM 23 while the main power supply circuit 12 is kept off will be described. As shown in FIG. 2, the circuit configuration of the electrical device 1 is the same as that in FIG. 1 (however, the standby power supply circuit 11 can supply a voltage necessary for program writing to the microcomputer). The electrical device 1 is directly connected to the program transmission device 2 without using the tool 3. That is, the first connecting means 16 is connected to the fourth connecting means 28. Specifically, the first voltage supply terminal 16A is connected to the fourth voltage supply terminal 28A, the program input terminal 16C is connected to the program output terminal 28C, and the ground terminal 16D is connected to the ground terminal 28D. On the other hand, the first switching control terminal 16B is not connected to any terminal and is open. Therefore, the first voltage supply terminal 16A and the first switching control terminal 16B are not short-circuited. Therefore, no voltage is supplied from the standby power supply circuit 11 to the base of the transistor 25, and the transistor 25 is not turned on. Accordingly, the main power supply circuit 11 is not turned on, and only the voltage from the standby power supply circuit 11 is supplied to the microcomputer 14 and the program transmission device 2.

  As described above, when the program can be written into the microcomputer 14 only with the voltage from the standby power supply circuit 11, the program can be performed only with the voltage from the standby power supply circuit 11 without using the writing jig 3. Perform writing. Therefore, useless power consumption can be reduced.

  It is also possible to execute program writing by connecting the electric device 301 having the conventional configuration shown in FIG. 3 to the writing jig 3 connected to the program transmitting device 2. Further, the writing jig 3 can be detached from the program transmission device 2 and the program writing can be executed by connecting the conventional electric device 301 shown in FIG. 3 directly to the program transmission device 2. These compatibility is possible because the writing jig 3 has the third connecting means 27 and the program transmitting apparatus 2 has the fourth connecting means 28.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. For example, the writing jig 3 may be integrated with the program transmission device 2 (that is, the third connecting means and the fourth connecting means may not be provided).

  The present invention can be suitably employed in various electric devices (for example, audio-visual devices such as TVs, DVD players, and amplifier devices) that write programs to the EEPROM of a microcomputer from the outside.

1 is a schematic circuit diagram illustrating a program writing system according to a preferred embodiment of the present invention. 1 is a schematic circuit diagram illustrating a program writing system according to a preferred embodiment of the present invention. It is a schematic circuit diagram which shows the conventional program writing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric equipment 2 Program transmitter 3 Writing jig 11 Standby power supply circuit 12 Main power supply circuit 14 Control means 15 Switching means 16 1st connection means 26 2nd connection means

Claims (2)

An electrical device, a program transmission device that transmits a program to the electrical device, and a writing jig connected between the electrical device and the program transmission device,
Control means including a memory in which the electrical device can rewrite a program;
A main power supply circuit which is supplied with an input voltage and supplies a voltage to the control means;
A standby power supply circuit which is supplied with an input voltage and supplies a voltage to the control means;
A switch and a transistor for controlling on / off of the switch; turning off the switch turns off the main power supply circuit; turning on the switch turns on the main power supply circuit Switching means;
A first connecting means including a first voltage supply terminal, a first switching control terminal, and a program input terminal, and connected to the writing jig;
The writing jig includes a second voltage supply terminal, a second switching control terminal connected to the second voltage supply terminal, and a program output terminal, and is connected to the first connection means. Second connection means
When the first connection means and the second connection means are connected, the first voltage supply terminal and the second voltage supply terminal are connected, and the first switching control terminal Is connected to the second switching control terminal, so that the voltage from the standby power supply circuit is changed to the first voltage supply terminal, the second voltage supply terminal, the second switching control terminal, and the second switching control terminal. The first switching control terminal is supplied in this order to the control electrode of the transistor, the switch is turned on, and the program input terminal and the program output terminal are connected, whereby the program transmission device Is written into the memory via the program output terminal and the program input terminal in this order. The writing jig further includes third connecting means connected to the program transmitting device,
2. The program writing system according to claim 1, wherein the program transmission device includes fourth connection means connected to the third connection means. 3.

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