JP2001101007A - Down-load method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a speech service even when a program is not normally down-loaded in a public telephone set for offering a speech service according to the execution of a program. SOLUTION: Second memories 18c1-18c8 are arranged so that each of them has the same address and different banks, and the plural second memories are divided into two groups according to the bank numbers. A first memory 18b and a third memory 18a whose address is different from that of the second memory are respectively provided with a table in which the program number and the bank number of the second memory are stored as a pair, and when the number and a writing address transmitted from a center are received before the down-load of a program, the bank number of the second memory is selected according to the value of the table, and the down-load program is stored in the second memory of the group different from the group with the bank number according to the writing address.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a download method for downloading a control program executed in a terminal such as a public telephone to the terminal via a telephone line.

[0002]

2. Description of the Related Art In general, some terminal devices such as public telephones receive a program downloaded via a telephone line or the like, and can execute various controls by using the program. In such a terminal device, for example, a program called a loader for downloading a control program is previously stored in an EPROM capable of erasing ultraviolet rays, and the terminal device executes the loader program to receive the control program. Then, the data is stored in an electrically writable and erasable EEPROM. When the storage of the control program in the EEPROM is completed,
In the terminal device, the execution of the program is switched to the EEPROM, and if the terminal device is, for example, a public telephone, the control of the telephone is started to provide various kinds of call services.

[0003]

However, if a communication error occurs during the download of the control program and the control program is not normally downloaded,
The control program written in the EEPROM is incomplete. For this reason, the terminal device cannot execute the control program, so that, for example, a call service cannot be provided until the control program is downloaded again and normally stored in the EEPROM. Therefore, an object of the present invention is to provide a service such as a call service even when a control program is not normally downloaded.

[0004]

According to the present invention, a control program downloaded from a center device via a telephone line is stored in a first memory (18).
b) received by execution of the loader program stored in the second memory (18c) in an address area different from the first memory and stored in the second memory (18c), and the control program stored in the second memory is executed to execute the service In the terminal device, the second memories are arranged in a plurality (18c1 to 18c8) such that each has the same address and is in a different bank, and the plurality of second memories are divided into two groups according to the bank number. The third memory (18a) in an address area different from the first memory and the second memory
A table storing pairs of the control program number and the bank number of the second memory, and receiving the control program number and the write address transmitted from the center device before the download of the control program. In this method, a bank number of the second memory is selected according to a value in a table, and the downloaded control program is stored in a second memory of a group different from the group of the selected bank number according to the write address. Updating a table in the third memory when the control program is stored in the second memory;
The updated table values are stored in a specific second memory (1
8c4).

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a public telephone 1 to which the present invention is applied.
FIG. 3 is a block diagram showing the configuration of FIG. In FIG. 1, reference numeral 11 denotes an incoming circuit for detecting an incoming signal arriving at a telephone line (hereinafter, line) L; 13 is a dial transmission circuit for transmitting a dial signal, 14 is a data transmission / reception circuit for performing data communication with a center device described later,
Reference numeral 15 denotes a communication circuit. Reference numeral 16 denotes a keyboard composed of dial keys or the like, 17 denotes a coin processing unit that performs processing such as sorting and storing of inserted coins, and 18 denotes a control unit that controls the above units. HS1 and HS2 are hook switches, and RL is a relay for capturing the line L.

By the way, when off-hook is performed on the public telephone 1 configured as described above, the hook switch HS1 is closed, and the station power is supplied to the power circuit 12 via the line L. Then, the power supply circuit 12 generates power of the voltage V from the station power and supplies it to the control unit 18 and the like. When activated by the power supply output from the power supply circuit 12, the control unit 18 first detects the state of the hook switch HS2 and recognizes that it has been activated for transmission. In addition,
The relay RL is driven by a starting circuit (not shown), and its contact is already closed.

Here, when a coin is inserted and the dial key of the keyboard 16 is operated, the control unit 18 detects the operation of the keyboard 16 and gives the operated dial number to the dial sending circuit 13 and the dial sending circuit 13 13 sends a dial signal to the exchange via the line L. As a result, the other party is called. When detecting a response to this call via a response detection circuit (not shown), the control unit 18 controls the coin processing unit 17 based on the reference call charge information stored in advance in the EEPROM 18, and the coins inserted and stored. To be stored. Thereafter, when the on-hook end is detected from the state of the hook switch HS2, the relay RL is driven to open its contact and end the call.

On the other hand, when an incoming call arrives on the line L by a call from the calling side, a predetermined voltage is generated by accumulating electric charges in a capacitor (not shown) of the incoming circuit 11 by an incoming signal of 16 Hz. The above-mentioned starting circuit is started by this voltage. As a result, the relay RL is driven, the contact is closed, and an incoming call is answered, the exchange is supplied with office power, and the control unit 18 is started. In this case, the control unit 18 detects the state of the hook switch HS2 and recognizes that the hook switch HS2 has been activated by the arrival of the incoming call. Thereafter, the control unit 18 shifts to the data communication mode, and performs data communication via the data transmission / reception circuit 14 with the center device that is the source of the incoming call. Then, call history information such as the number of calls using the public telephone 1 stored in a memory such as an EEPROM described later, information on the amount of stored coins stored in the coin processing unit 17 of the public telephone 1, and the like. Is transmitted to the center device.

FIG. 2 is a block diagram showing a configuration of the above-mentioned center device for performing data communication with the public telephone 1. As shown in FIG. As described above, the center device 2 manages the operation status of each public telephone by calling the public telephone, collecting call history information of the public telephone, information on the amount of stored coins, and the like. In addition, the center device 2 transmits a new reference call charge information by calling each pay telephone when the call charge is revised or the like, and stores coins in each pay telephone based on the new call charge system. Let it do. Further, it has a function of downloading data of a control program executed by each public telephone to each public telephone, and causing each public telephone to execute the control program to perform a call service. In FIG. 2, a center device 2 includes a line group 2 including a plurality of lines.
1, a line control unit 22, a display unit 23, a storage unit 24, a keyboard 25, a printer 26, and a control unit 27 for controlling the above units.

When the control program described above is downloaded from the center device 2 via the line L, the control unit 18 of the public telephone 1 receives the control program via the data transmission / reception circuit 14 and stores it in an internal memory. Store. FIG. 3 is a block diagram showing the configuration of the control unit 18. In the figure, a control unit 18 includes a CPU 18
A, RAMs 18B and 18C, electrically erasable and erasable EEPROMs 18D and 18E, ultraviolet erasable EPROM 18F, and bank switching circuit 18G
Consists of FIG. 4 is a diagram showing a memory map of the CPU 18A. The start address “0000” H (“H” is 16
), An I / O unit (for example, a port for accessing the dial sending circuit 13), a work RAM 18B, setting data relating to this public telephone, the above-mentioned call history information, and information on the amount of stored coins. Are allocated to each area of the EEPROM 18D.

In this public telephone 1, since the capacity of each program and data is larger than the access range of the CPU 18A, the latter address "8000" H to "FFF" is used.
The area up to F "H is defined as a bank switching area. Then, the program is stored in this bank switching area.
PROM 18F, EEP in which program is stored similarly
The ROM 18E and the RAM 18C for storing data are arranged redundantly, and the CPU 18A executes programs and accesses data while switching between them. The bank is always switched to the EPROM 18F and the CPU 18A is accessed. The EPROM 18F has a loader unit 1 for storing a loader program for loading the program.
8F1 and an emergency call function unit 18F2 (third memory) for storing a program for making an emergency call with the public telephone 1.

Here, when a new control program with a function added to the public telephone 1 is transmitted from the center apparatus 2 to add a function to the public telephone 1, the CPU 18A loads the loader unit 18F1. Is executed to transfer another program of the loader unit 18F1 to the RAM 18B, and this time, the transferred loader program is executed to store the new control program in a separate area (the fourth memory) of the RAM 18B. ). Thereafter, the CPU 18A further executes the loader program transferred to the RAM 18B to execute the EEPROM
Bank switching is performed so that M18E (second memory) can be accessed. Then, the switched EEPROM 18E
Then, the new control program stored in the RAM 18B is transferred. After the transfer is completed, the CPU 18
A executes a new control program in the EEPROM 18E to provide a call service. Here, in this embodiment, when the control program is downloaded, the EPROM
The program of the loader section 18F1 in the 18F is stored in the RAM1
8B, an EPROM is provided as a first memory in this transfer area, and a loader program is stored in the EPROM.
1 may be omitted.

As described above, the control program executed by the public telephone 1 is downloaded from the center device 2. Since the download of this program is performed by a modem signal or the like via the analog line L, communication time is longer than that of a download via a digital line such as an ISDN line. Therefore, the probability of a communication failure due to the occurrence of noise or the like during the download increases. Here, once a communication failure occurs, conventionally, there is a problem that the call service cannot be performed until the download is performed again. For this reason, EPROM1
8F, the above-described emergency call function unit 18F2 is provided. If a communication error occurs during the loading of the control program, the program of the emergency call function unit 18F2 is executed until “110” is downloaded again to execute “110”. "
It is possible to provide an emergency and minimum call service such as a call number or a "119" number call.

FIG. 5 is a flowchart showing the operation of the center device 2 and the public telephone 1 when the control program is downloaded. The operation of the main part of the present invention will be described in further detail based on this flowchart. When the function of the public telephone 1 is added, the center device 2 adds a program for a new function to all the control programs of the public telephone 1 by operating the keyboard 25 or the like to form a new control program. The information is stored in the storage unit 24. Thereafter, the control unit 27 controls the line control unit 22 to call the public telephone 1 via any one of the lines in the line group 21 and call the public telephone 1 (step S1).

Here, when public telephone 1 responds to this call in step S2, center device 2 transmits a program download instruction command to public telephone 1. In this case, the CPU 18A of the public telephone 1 is connected to the loader unit 18F.
The first program is executed, and it is determined in step S3 whether or not a program download instruction command has been received. When the instruction command is received via the data transmission / reception circuit 14, the loader program executed after the loader unit 18F1 is copied to the RAM 18B in step S5. Thereafter, the CPU 18A executes the program copied to the RAM 18B, and returns a reception start signal to the center device 2 via the data transmission / reception circuit 14 in step S6.

After that, the CPU 18A operates the RAM 1
8B, the new control program is received from the center device 2 via the data transmission / reception circuit 14, and the process proceeds to step S
In step 7, the data is stored in a separate area of the RAM 18B. In step S8, it is determined whether the reception of the new control program has been completed.
When stored in B, the stored control program is checked in step S9.

Here, if an error occurs when checking the control program stored in the RAM 18B, it is determined that the new control program was not correctly received due to some communication abnormality, and the reception NG (reception error) Then, the process proceeds to the end of the loading process of the control program. In this case, the CPU 18A executes the program of the emergency call function unit 18F2 until a new control program is downloaded from the center device 2, and provides the above-described emergency call service. Thereafter, when there is another call from the center device 2, step S
Then, the process returns to step S2 to respond to the call, and executes the control program receiving process from step S3.

On the other hand, if the check result of the program stored in the RAM 18B is normal and the determination in the step S10 becomes "Y", the CPU 18A controls the telephone set (that is, the call service) by the program of the RAM 18B. That is, the program is set to a state in which the program can be started (step S11). Next, the CPU 18A further executes the loader program copied to the RAM 18B to switch the bank from the EPROM 18F to the EEPROM 18E, and
Enables U18A to access EEPROM 18E. Then, the new control program temporarily stored in the RAM 18B is stored in the EEPROM 18E in step S12.
Transfer to and write.

Here, the new control program is called EEPRO.
When all the data has been written to the M18E and the determination in step S13 is "Y", the CPU 18A continues to execute the loader program in the RAM 18B, and checks the control program in the EEPROM 18E in step S14.
If the check result of the control program written in the EEPROM 18E is normal, the CPU 18A
The program is set so that the telephone can be controlled by the program in the EPROM 18E, that is, the program can be started, and the process ends (step S16). Then the CPU
18A executes a program of the EEPROM 18E which has been enabled to perform a new call service (step S17). If the check result of the control program written in the EEPROM 18E is abnormal and becomes “N” in step S15, the CPU 18A ends the control program loading process. In this case CPU1
8A performs a new call service by executing the new control program of the RAM 18B that has already been set to its start-up enabled state in step S11.

By providing the emergency call function section 18F2 in the EPROM 18F, an emergency call can be made even when the download of the control program has failed. Therefore, it is possible to avoid a situation in which the telephone service of the public telephone 1 is completely stopped when the download of the control program fails. The control program downloaded from the center device 2 is stored in a RAM 18B, an EEPROM,
By storing in the order of 18E, the following effects can be expected.

That is, when the control program is downloaded once again to the public telephone whose control program has been downloaded once and stored in the EEPROM 18E, this control program is directly transmitted to the EEPROM 1E.
8E, even if the download of the control program fails, the EEPROM 18E
The call service can be provided by the previous program stored in. Even when the program cannot be stored in the EEPROM 18E, the program in the RAM 18B can be executed. Therefore, if the contents of the RAM 18B are backed up by a battery or the like, a new call service can be provided by executing the program of the RAM 18B after the download is completed.

FIG. 6 is a flowchart showing the program execution status of CPU 18A of public telephone 1 operating as described above. That is, the CPU 18A first sets the EEPR
The control program is stored in the OM 18E, and the check result of the control program is normal and the
If "Y" is determined in step S22, EEPRO is determined in step S22.
The M18E program is executed to control the telephone and implement the telephone service of the public telephone. Also, EEPROM
If the control program is not stored in 18E, or if the stored program is not a normal program, it is next determined whether or not the control program is stored in RAM 18B.

Here, if the control program is stored in the RAM 18B, and the check result is normal and “Y” is obtained in step S23, the control program proceeds to step S24.
Execute the control program of 18B to perform telephone control,
Similarly, a call service is implemented. If the control program is not stored in the RAM 18B, or if the check result is abnormal even though the control program is stored,
The PU 18A determines in step S25 that the emergency call function unit 18F
2 or the program of the loader unit 18F1.

Next, as a second example, the CPU 18A executes the program of the loader section 18F1 to execute
When receiving the program download instruction command from the loader unit 18F1, the loader program data of the loader unit 18F1 is copied to the RAM 18B in step S5 in FIG. After that, the CPU 18A returns to the RAM 18B.
The control program downloaded from the center device 2 by executing the loader program copied to the
8C. When all the downloaded control programs are normally stored in the RAM 18C, the CP
U18A subsequently executes the loader program to execute R
The control program of the AM 18C is transferred to and stored in the EEPROM 18E while performing bank switching. As a result, a large-capacity control program (equivalent to approximately 32 Kbytes) downloaded from the center device 2 can be stored in the public telephone 1.

In this case, even if the control program is not normally stored in the EEPROM 18E or cannot be stored at all, if the contents of the RAM 18C are backed up by a battery or the like, the RAM 1C is stored in the RAM 1C in step S24 of FIG.
The new control program of 8C can be executed. In the present embodiment, an example of a public telephone has been described, but the same effect can be obtained by applying the present invention to a terminal device such as a data processing device in which a control program is downloaded via a telephone line. . That is, such a terminal device is configured such that, when the control program is not normally downloaded, a program for performing a minimum service corresponding to the program of the emergency call function unit 18F2 is executed.

FIG. 7 is a block diagram showing a second configuration of the control unit 18. As shown in FIG. In the second example, the CPU 18A
RAM 18a, mask ROM 18
b, an example in which the flash memories 18c1 to 18c8 are connected. Then, the CPU 18A accesses the eight flash memories 18c1 to 18c8 by switching banks using the bank switching circuit 18d. In the figure, # 1 to # 8 indicate bank numbers.

FIG. 8 shows C in the second configuration example shown in FIG.
It is a figure which shows the memory map of PU18A, I / O from a head address "0000" H to "3FFF" H address sequentially.
The area of the RAM 18a for the O part and the work is allocated,
Next, the area of the mask ROM 18b is allocated from the address "4000" to the address "7FFF". Also,
Addresses “8000” H to “FFFF” H in the latter half are allocated to the areas of the flash memories 18 c 1 to 18 c 8 for storing the above-described control programs and setting information of the public telephone 1.

The mask ROM 18b has a real-time OS 18b1 for managing execution of a control program stored in each flash memory, a loader 18b2 for storing a program for loading a program into each flash memory, and a real-time OS 18b2 when a system goes down. A system down table 18b3 for storing information such as which program the OS 18b1 runs is provided. The RAM 18a and the flash memories 18c4 are provided with program definition tables 18a1 and 18e, respectively, which will be described later.

FIG. 9 is a diagram showing the structure of such a program definition table, in which program numbers, bank numbers and start addresses of the programs stored in each flash memory are stored. Here, the flash memories provided for each bank are grouped as a group A for the flash memories 18c1 to 18c4 and a group B for the flash memories 18c5 to 18c8, as shown in FIG.

When rewriting the control program of the flash memory 18c1 (# 1) of the group A, for example, the rewritten content is stored in the flash memory 18c5 (# 5) belonging to the group B. Conversely, when rewriting the flash memory 18c5 (# 5) of the group B, the rewritten content is stored in the flash memory 18c1 (# 1) belonging to the group A.

The same applies to, for example, the flash memory 18c2 (# 2) of the group A. When the control program of the memory is rewritten, the rewritten contents are stored in the flash memory 18c6 (# 6) belonging to the group B. Store. Conversely, when rewriting the flash memory 18c6 (# 6) of the group B, the rewritten content is stored in the flash memory 18c2 (# 2) belonging to the group A. The same applies to the other flash memories 18c3 and 18c4 of the group A, and the other flash memories 18c7 and 18c8 of the group B corresponding to the other flash memories 18c3 and 18c4, respectively.

That is, for example, the flash memory 18c
4 shows the contents of the program definition table 18e in FIG.
When the situation as shown in FIG.
For example, rewrite data of the program data of program number "4" starting from address "8000" H is transmitted, and the storage start address is "9000" H.
It is assumed that According to this table, the control program of the program number "4" is stored in the flash memory 18c3 corresponding to the bank number # 3, so the control unit 18A stores the rewrite program data in the flash memory 18c3 corresponding to the bank number # 7. It is stored in the memory 18c3. When the storage of the program data is completed,
The contents of the program definition table 18e in the flash memory 18c4 are rewritten as shown in FIG. CPU
18A is executed by the real-time OS 18b1.
Since the execution of the control program is managed in accordance with the contents of the table 18e, even if the loading of the program data fails, the control program of one version can be executed, so that the call service of the public telephone 1 is completely stopped. Can be avoided.

FIGS. 11 and 12 are flowcharts showing the loading operation of the program data downloaded from the center device. The operation of the main part of the public telephone 1 will be described with reference to this flowchart. When an incoming signal arrives at the line L due to a call from the center device 2, the relay RL is activated by the incoming signal, and a contact of the relay RL is closed, thereby forming a loop of the line L (step S in FIG. 11).
31). Then, the station power is supplied to the control unit 18 to turn on the power, and the CPU 18A is activated (step S32). When activated, the CPU 18A starts executing the program of the loader unit 18b2 in accordance with a command from the real-time OS 18b1 to be executed first. Then, first, the contents of the program definition table 18a1 of the RAM 18a whose contents are backed up are checked, and if the contents are normal, the process proceeds to step S41.

In the case of an abnormality, the bank is switched to the flash memory 18c4 specified in advance, and the contents of the program definition table 18e provided therein are checked (step S35). If this is normal, the process proceeds to step S38. In the case of an abnormality, the operation of the telephone is disabled (step S37). In step S38, the bank switching of all the other flash memories is sequentially performed to check the program data in each flash memory. In the case of abnormality, the operation of the telephone is disabled.
The contents of the table 18e in c4 are copied to the table 18a1 in the RAM 18a (step S40).

Then, in a step S41, it is determined whether or not the operation is started by the arrival of the incoming call. If it is determined that the data transmission / reception circuit has been activated by the arrival of an incoming call, if it is in the on-hook state at this time, the data transmitting / receiving circuit
Is initialized (step S43), and an answer tone is transmitted from a tone transmission circuit (not shown) (step S44).
After the transmission is completed, a timer for a predetermined time is started (step S45). Next, in steps S46 and S47, it is determined whether the timer has expired and whether or not a connection for performing data communication with the center device 2 has been made. If the timer times out before the connection of
L is restored, and the process ends (step S48).

If the connection for data communication with the center device 2 is made before the timer expires, the process proceeds to step S61 in FIG. If an off-hook is detected during an incoming call, the incoming call is made (step S39). Also, when activated by off-hook, the call is an outgoing call (step S51), and when activated in the non-received and on-hook state, the relay RL is restored because of an abnormality of the public telephone 1 (step S48).

In steps S61 and S62 of FIG.
It is determined that the timer has expired and that the modem signal carrier via the data transmission / reception circuit 14 has been disconnected. In each of these steps, if all are determined to be “N”, the process proceeds to step S63, and it is determined in step S63 whether command data indicating download data from center device 2 has been received. Here, the download data from the center device 2 to the public telephone 1 is transmitted in the following order. That is, first, the parameter data including the program number and its write start address is transmitted, then the program data and its checksum data are transmitted, and finally the end instruction data is transmitted.

Here, if the reception of the above-mentioned command data is "Y" in step S63 and the reception of parameter data is "Y" in step S64, a program number is obtained from the parameter data (step S65). Then, it is determined with reference to the program definition table 18a1 in the RAM 18a whether or not the program number corresponds to the program of the flash memory of which bank. In step S66, it is determined whether the bank number of the flash memory corresponding to the reception program number thus determined belongs to group A or B. If it belongs to group A, the bank of group B obtained by adding +4 to the designated bank number Is selected (step S67). If the bank belongs to the group B, the designated bank number is selected as it is and set as the bank of the group A (step S68).

A write start address is obtained from the received parameter data (step S69), and is set in the table 18a1 of the RAM 18a along with the program start address and the selected bank number (step S69). S70). Next, the checksum data corresponding to these data set in the table 18a1 is cleared (step S71), and the process returns to step S61.

Next, program data is transmitted from the center device 2, and the reception is determined in step S72. The program data is sent in units of 128 bytes. If the reception of the program data is determined to be "Y" in step S72, a check sum of the 128 bytes of program data is calculated in step S73, and the last 2 bytes of the checksum are calculated. Is added to the checksum area (2-byte area) of the RAM 18a (step S74). After that, the flash memory corresponding to the selected bank number is selected, and the received 128-byte program data is written in order from the write start address of the selected flash memory (step S75). After the writing is completed, the write address is advanced by the number of write bytes (128 bytes) (step S76). When the reception and writing of the program data of 128 bytes are completed in this way, the same reception and writing processing of the next 128 bytes is performed in step S72.
ＳS76 is executed.

After all the program data transmitted from the center device 2 is received and written into the flash memory in this way, the checksum data relating to the program data is transmitted from the center device 2. If the checksum data is received and determined to be "Y" in step S77, the received checksum is compared with the checksum of the received program data calculated and added in steps S73 and S74 (step S78).
If these match and the determination in step S79 is “Y”, it means that the download has been completed normally,
The checksum of each data of the table 18a1 of M18a is calculated, and R is calculated corresponding to the table 18a1.
It is set in the AM 18a (step S80).

Finally, the end instruction data transmitted from the center device 2 is received, and "Y" is determined in step S81.
Then, in step S82, after confirming the normal end of the download, in step S83, the contents (including the checksum data) of the table 18a1 of the RAM 18a are copied to the table 18e of the specific flash memory 18C4. Thereafter, in step S84, only the checksum data corresponding to the table data is destroyed while leaving the table value of the table 18a1 in the RAM 18a as it is, and the process returns to step S48 in FIG. 11 to restore the relay RL, release the line, and terminate. .

As a result, when the control program is loaded again in the public telephone 1, if the contents including the checksum of the table 18a1 in the RAM 18a are checked in step S33 in FIG. 11, step S3
4 is always "N", so that step S40
And the table 18e in the specific flash memory 18C4
Is copied to the table 18a1 in the RAM 18a. Thereafter, the real-time OS 18b1 executed by the CPU 18A manages the execution of each control program based on the value of the table 18e in the specific flash memory 18C4 as described above. If the received checksum and the checksum calculated from the received program data do not match, "N" is obtained in step S79, so that the checksum corresponding to the data in the table 18a1 of the RAM 18a is similarly destroyed. .

[0044]

As described above, according to the present invention, the control program downloaded from the center device via the telephone line is received by executing the loader program stored in the first memory, and the control program is stored in the first memory. In a terminal device which stores in a second memory of a different address area and performs a service by executing a control program stored in the second memory, each of the second memories has the same address and a different bank. And the plurality of second memories are divided into two groups according to the bank number, and the control program number and the second memory are stored in a third memory in an address area different from the first memory and the second memory. A table is stored in which the bank numbers of the memories are stored in pairs, and transmitted from the center device before the control program is downloaded. When the control program number and write address received are selected, the bank number of the second memory is selected according to the value of the table, and the control downloaded to the second memory of a group different from the group of the selected bank number is selected. Since the program is stored in accordance with the write address, the previously loaded program can be executed even when the rewriting of a large-capacity program fails. Also,
When the control program is stored in the second memory, the table of the third memory is updated, and the updated value of the table is copied to the specific second memory.
The loading and execution management of the program can be appropriately performed by the table value copied to the specific second memory.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a public telephone to which a download method according to the present invention is applied.

FIG. 2 is a block diagram of a center device for downloading a program to the public telephone.

FIG. 3 is a block diagram illustrating a configuration of a control unit of the public telephone.

FIG. 4 is a diagram showing a memory map of a CPU constituting the control unit.

FIG. 5 is a flowchart showing the operation of the main part of the center device and the public telephone.

FIG. 6 is a flowchart showing a telephone control operation of the CPU.

FIG. 7 is a block diagram illustrating a second configuration of the control unit.

FIG. 8 is a diagram showing a memory map of a CPU based on a second configuration example of the control unit.

FIG. 9 is a diagram showing a status of rewriting a program definition table.

FIG. 10 is a diagram showing a bank switching state of each flash memory in which a program is stored.

FIG. 11 is a flowchart illustrating an operation of a main part of the CPU based on a second configuration example of the control unit.

FIG. 12 is a flowchart illustrating an operation of a main part of the CPU based on a second configuration example of the control unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Public telephone, 2 ... Center device, 11 ... Receiving circuit, 1
4. Data transmission / reception circuit, 18, 27 ... control unit, 18A ...
CPU, 18B, 18C, 18a ... RAM, 18D, 1
8E: EEPROM, 18F: EPROM, 18b: Mask ROM, 18c1 to 18c8: Flash memory,
18a1, 18e: Program definition table, 21: Line group, 22: Line control unit, L: Telephone line (line).

Claims (2)

[Claims] A control program downloaded from a center device via a telephone line is stored in a first memory (18b).
The second memory (18) received by the execution of the loader program stored in the second memory (18) in an address area different from the first memory
c) while executing a control program stored in the second memory and providing a service, wherein a plurality of (18c1 to 18c1) are stored in the second memory so that each has the same address and a different bank. 18c8) Arrange,
In addition, the plurality of second memories are divided into two groups according to the bank number, and the number of the control program and the second memory are stored in the third memory (18a) in an address area different from that of the first memory and the second memory. A table storing the bank numbers of the second memory in pairs, and upon receiving the control program number and the write address transmitted from the center device before the download of the control program, the bank number of the second memory according to the value of the table And storing the downloaded control program in the second memory of a group different from the group of the selected bank number in accordance with the write address. 2. The method according to claim 1, wherein the control unit updates the table of the third memory when the control program is stored in the second memory, and copies the updated value of the table to a specific second memory (18c4). Download method.