JPH05173917A - Data processing system for communication terminal - Google Patents

Abstract

PURPOSE:To enable the addition and the change of functions which are not anticipated at the beginning of development in a communication terminal whose functions can be added and changed by addition of an external memory. CONSTITUTION:Both of application soft and fundamental processing soft are stored in the external memory 4, and branching processing soft is stored in the ROM area 2 of a built-in memory in addition to the fundamental processing soft and the application soft for service which are initially mounted; and when setting of the external memory 4 is detected by an I/O 5, a CPU 1 operates a selective circuit 6 to switch the memory selection from the incorporated memory 2 to the external memory 4 based on the branching processing soft, and the CPU 1 branches the processing flow to the direction of fundamental processing soft and application soft in the external memory 4. Thus, the new service whose processing change is extended up to the fundamental processing and which is not expected at the beginning of development is provided since fundamental processing soft is included in the external memory 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing method for a communication terminal, and more particularly to data processing in a communication terminal such as a ROM card or an IC card in which an external memory is attached to add or change functions. It is about the method.

[0002]

2. Description of the Related Art A communication terminal using a microcomputer is known in which an external memory is attached and a new service can be provided by adding or expanding or changing a function.

In general, microcomputer application equipment is
Built-in memory for storing various software and control data for operating the microcomputer,
The memory is a ROM area for storing basic processing software,
It is composed of a ROM area for storing application software and a RAM area assigned to a main memory for storing control data, and the external memory in the known communication terminal is a ROM storing only application software, Access to the application software when the external memory is attached is performed through the basic processing software of the internal memory.

[0004]

According to the above conventional technique, the addition or modification of the function of the communication terminal is limited to the modification of the application software controlled based on the basic processing software in the built-in memory. , It is not possible to deal with the addition or change of functions other than those planned in advance at the time of product development (even if it is possible, it is impossible to change the basic processing software, so add functions that were not supposed at the time of product development, Or, the range that can be changed is extremely narrow.)

Even when the function is not added or changed, for example, when the function check of the communication terminal is performed by the self-diagnosis program, there is generally a difference in the control based on the basic processing software between the function check and the operation. If you try to add a self-diagnosis function to a communication terminal, it is necessary to add in advance to the basic processing software that is stored in the built-in memory, software that is not needed during operation (necessary only for self-diagnosis). There is a problem that not only the processing software becomes complicated but also a lot of ROM area of the built-in memory is required.

The present invention proposes to solve the above problems, and the range in which functions can be added or changed by adding an external memory can be greatly expanded beyond the range originally planned, and Another object of the present invention is to obtain a data processing method for a communication terminal that can easily realize a self-diagnosis function by using an external memory.

[0007]

To solve the above problems, the present invention stores both basic processing software and application software in an external memory, and stores basic processing software and application software in a built-in memory. RO
In addition to the M area, a ROM that stores branch processing software that controls the branch of processing to the external memory is provided, and when the external memory is installed, the processing flow is executed by the branch processing software to perform the basic processing of the external memory. It is designed to perform processing by branching in the direction of software and application software, and in consideration of the addition or change of functions planned from the beginning, the basic processing software and application software are used as external memory. The first external memory that stores the, and the second memory that stores only the application software
When the external memory is prepared and the external memory is installed, if the external memory is the first external memory, the processing flow is stored in the first external memory by the branch processing software. When the external memory is the second memory, only the processing flow related to the application software by the branch processing software is stored in the second external memory. It is designed to branch in the direction of software.

[0008]

[Function] R for storing application software in external memory
In addition to the OM area, a ROM area for storing basic processing software is provided, so it is possible to add or change functions that could not be expected at the beginning, and by storing the basic processing software related to the self-diagnosis function in an external memory. The self-diagnosis function can be easily added to the communication terminal without complicating the basic processing software during operation.

Since two types of external memories are prepared, one containing basic processing software and application software and the other containing only application software, it is possible to add or change functions planned from the beginning of development. As a result, the software stored in the external memory is not complicated.

[0010]

1 is a block diagram of a first embodiment, FIG. 2 is a block diagram of a second embodiment, and FIGS. 3 (A) to 3 (C). FIG. 3 is a configuration diagram of a physical memory map. In FIG. 3, (A) and (B) are commonly used in both the first embodiment and the second embodiment (in the first embodiment, “second external memory” is replaced with “external memory”). Be used instead of). (C) is used only in the second embodiment.

First, the first embodiment will be described.

As shown in FIG. 1, the control unit of the communication terminal according to the first embodiment comprises a CPU 1, a ROM area 2 of a built-in memory, a RAM area 3 of a built-in memory, and an external memory 4.
An I / O 5 for detecting attachment of the external memory 4, a selection circuit 6 for selecting the ROM area 2 of the internal memory or the external memory 4, and an address switching for switching the address of the RAM area 3 of the internal memory. It consists of circuit 7.

The ROM area 2 and RAM area 3 of the internal memory, the external memory 4, and the I / O 5 are respectively the CPU 1
Are connected to each other by an address bus a, a data bus b and a chip select line c, and a selection circuit 6 is inserted and connected between the ROM area 2 and the external memory 4 and the chip select line c. An address switching circuit 7 is inserted and connected between the area 3 and the address bus a, and is connected between the I / O 5 and the selection circuit 6 and the I / O 5
And the address switching circuit are connected between the information lines d and e, respectively.
Is provided. Also, the external memory 4 has a mounting connector 8
Is connected to the control unit via.

The ROM area 2 of the built-in memory is shown in FIG.
As can be understood from the physical memory map configuration diagram of (A) at the normal time, the storage unit of the basic processing software 201, the storage unit of the application software 202, and the branch processing software 203
And a RAM area 3 is allocated to the main storage memory 301.

The external memory 4 is, for example, a ROM card or IC
As shown in the physical memory map configuration diagram at the time of switching of FIG. 3B, the basic processing software 201 stored in the ROM area 2 is separate from the basic processing software 201 (hereinafter, New basic processing software) 40
1 and the application software 202 stored in the ROM area 2 are separate application software (hereinafter referred to as new application software) 402A.

In a normal state (when the external memory 4 is not attached to the attachment connector 8), as shown in FIG.
It is connected to the OM area 2, and the configuration of the physical memory map at this time is as shown in FIG. CPU1
Performs control using the RAM area 3 as the main storage memory 301 based on the basic processing software 201 and the application software 202 stored in the ROM area 2 of the built-in memory.

The determination that the external memory 4 is not attached is made based on the detection information of the I / O 5 at the start of the processing by the CPU 1 (when the power of the communication terminal is turned on).

Next, when the external memory is mounted, I
/ O5 has detected that the external memory 4 has been installed, and CP
When U1 detects the attachment of the external memory 4 from the I / O 5 at the start of processing, the branch processing software 203 causes the I / O
5, the external memory selection information is sent to the selection circuit 6 via the information line d, the switch S is switched, the connection of the chip select line c is switched from the internal memory ROM area 2 to the external memory 4, and the information line The address switching information is sent to the address switching circuit 7 via e and the built-in memory R
The address of the AM area 3 is switched.

As a result of the above control, the physical memory map has a new basic processing software 401 and new application software 402A in which the basic processing software and the application software are stored in the external memory 4, as shown in FIG. 3B.
Then, the address of the main memory 301 is switched to the address at the time of processing by the external memory 4.

The switching of the address of the main storage memory 301 assigned to the internal memory RAM area 3 as described above is necessary during the control by the internal memory ROM area 2 and the processing by the external memory ROM area 4. This is because the capacities of the storage memories 301 are generally different (generally required when the external memory 4 is mounted),
Depending on the content of the new application 402A, it may not be necessary to switch the address.

Since the physical memory map configuration is as shown in FIG. 3B, the CPU 1 processes the processing flow toward the new basic processing software 401 and the new application software 402A. Also, by switching the basic processing software itself to a new one, it is possible to easily add or change functions that require changes to the basic processing part, add or change functions not planned at the beginning of development, and communication terminals. The self-diagnosis of is extremely easily possible.

Next, a second embodiment will be described.

In the second embodiment, as shown in FIG. 2, the built-in memory ROM area 2 is the storage section 2 of the basic processing software 201.
1 and the storage unit 22 of the application software 202 are separately accessed by the CPU 1,
The I / O 5 is similar to the first embodiment except that it has a function of detecting the presence / absence of attachment of the external memory 4 and a function of identifying the type of the external memory 4 that has detected attachment. The attached memory 4 is a first external memory (referred to as 41) in which new basic processing software 401 and new application software 402A similar to those in the first embodiment are stored, and FIG.
As can be understood from the memory map configuration diagram at the time of switching in (C), two types of second external memory (referred to as 42) storing only the new application software 402B are prepared.

The normal operation is the same as that of the first embodiment.

When the external memory 41 or 42 is mounted, the I / O 5 detects the mounting of the external memory 41 or 42 and the type thereof, and the CPU 1 detects from the I / O 5 at the start of the process. Read only detection information.

When the information read from the I / O 5 by the CPU 1 is the mounting information of the first external memory 41, the CP
U1 sends the first external memory selection information from the I / O 5 to the selection circuit 6 via the information line d by the branch processing software 203 (included in the built-in memory ROM area 21), opens the switch S1, and opens the switch. By switching S2, the internal memory ROM areas 21 and 22 are set to the chip select line c.
And the first external memory 41 is connected to the chip select line c.

By the above control, the same state as when the external memory 4 in the first embodiment is mounted is obtained, and the subsequent operation can be easily understood from the description of the first embodiment.

When the information read from the I / O 5 by the CPU 1 is the mounting information of the second external memory 42, the CP
U1 sends the second external memory selection information to the selection circuit 6 in the same manner as described above, switches the switch S2 while keeping the switch S1 inoperative, and connects the internal memory ROM area 21 to the chip select line c. While maintaining, the internal memory ROM area 22 is separated from the chip select line c, and the second external memory 42 is connected to the chip select line c.

By the above control, the physical memory map at this time has a new application software 402B in which only the application software is stored in the external memory 4, as shown in FIG. Only the processing flow according to (4) is processed toward the new application software 402B.

In the second embodiment as well, the I / O
The address switching circuit 7 switches the address of the built-in memory RAM area 3 according to the address switching information from 5, as in the first embodiment.

Further, in FIG. 2 or FIG. 3, the selection circuit 6
The switching means is represented as a mechanical switch, but this is for easy understanding, and is normally composed of a physical circuit by a combination of gates. Further, particularly in the second embodiment shown in FIG. 2, a built-in memory R storing basic processing software
Regarding the OM area 21, when it is not necessary to select it (when the first external memory 41 is used), the CPU
The internal memory ROM area 21 may be prevented from being chip-selected from 1 to 1, and such a case is included in the gist of the present invention (the memory selecting means is configured by the processing software of the CPU 1).

[0032]

As described above, according to the present invention, the control software of the communication terminal including the basic processing software is stored in the external memory, and a new service which was not planned from the beginning of the development is provided. Can be provided by the external memory, and the self-diagnosis function of the communication terminal can be provided by the external memory without complicating the processing software of the communication terminal body.

Further, when both the external memory including the basic processing software and those not including the basic processing software are prepared, and when the external memory is attached to the communication terminal, the type of the external memory is judged and the process flow is branched. Since the above is decided, there is an effect that the above-mentioned benefits can be enjoyed and the software stored in the external memory for the service already planned at the beginning of development is not complicated.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a second embodiment of the present invention.

FIG. 3A is a physical memory map configuration diagram at a normal time.
FIG. 6B is a configuration diagram of a physical memory map when switching to the first external memory. FIG. 6C is a configuration diagram of a physical memory map when switching to the second external memory.

[Explanation of symbols]

1 ... CPU 2,21,22 ... Internal memory ROM area 3 ... Internal memory RAM area 4,41,42 ... External memory 5 ... External memory installation presence / absence detection I / O 6 ... Selection circuit 7 ... Address switching circuit

Claims (3)

[Claims] 1. In a communication terminal controlled by data processing by a CPU and capable of adding or changing functions by adding an external memory, an internal memory fixedly provided in the communication terminal as a data processing memory, There is an external memory detachably provided in the communication terminal, the communication terminal has a selection means for selecting either the internal memory or the external memory, and the internal memory is the basic processing software and the application. It is composed of a ROM storing software and branch processing software, and a RAM constituting a main memory, the external memory is a ROM storing basic processing software and application software, and the CPU is
At the start of the process, the ROM of the internal memory is first accessed, and the presence or absence of the external memory is judged by the branch processing software in the ROM. If the external memory is installed, the external means is selected by the selecting means. A data processing method for a communication terminal in which a memory is selected and a processing flow is branched and processed in the direction of the basic processing software and application software stored in the external memory. 2. The data processing method for a communication terminal according to claim 1, wherein a first external memory, which is a ROM storing basic processing software and application software, and application software are stored as external memory. R
A second external memory consisting of OM is prepared, and when the branch processing software in the ROM of the built-in memory determines that the external memory is installed, the installed external memory is the first external memory. Or a second external memory, and when the first external memory is installed,
The first external memory is selected by the selecting means, the processing flow is branched toward the basic processing software and the application software stored in the first external memory for processing, and the second external memory is processed. When is installed, the built-in memory and the second external memory are selected by the selecting means, and only the processing flow relating to the application software is branched in the direction of the application software stored in the second external memory. The data processing method of the communication terminal to be processed. 3. The data processing method for a communication terminal according to claim 1 or 2, wherein the communication terminal has means for switching the address of the RAM area of the built-in memory, and when the built-in memory is selected or when the built-in memory is selected. A data processing method for a communication terminal that uses a RAM area with a different address when the attached memory is selected.