JPS63153690A - Ic card connection discriminating device for electronic device - Google Patents

Abstract

PURPOSE:To miniaturize an electronic device by omitting a sensing switch and its mount space by discriminating the presence of IC card connection based on a voltage level of an input port for detecting voltage change. CONSTITUTION:With no IC card 10 loaded, a voltage of nearly 5V is applied to an analog input/output port AN of a CPU 4 via a resistor R0 and a diode D0. On the other hand, a voltage of nearly 3V from a lithium battery E is applied to a dictionary memory 11 of the IC card 10 via a resistor R1, where dictionary data are stored. In loading the IC card 10, the voltage of 3V from the lithium battery E is applied to the analog input/output port AN, it is detected and the connection of the IC card 10 is discriminated. In this case, when the voltage of the analog input/output port AN is 1.5V or below, since it means that the lithium battery E does not give any guaranteed voltage, the dictionary data of the dictionary memory 11 are initialized automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an IC card connection determination device for electronic equipment.

(Prior art) In recent years, single-chip microcontrollers and ROM (read-only)
IC cards with built-in RAM (random access memory) or RAM (random access memory) are used in a wide variety of fields, such as cash cards, credit cards, identification cards, health charts, and telephone cards, and are an important portable device. It has become popular as an information medium.

In electronic devices that removably connect IC cards with male connectors (or female connectors) among the above IC cards, if the IC card is connected while the electronic device is powered on, the IC card may be destroyed by high voltage. It has been proposed to provide a detection switch such as a limit switch near a female connector (or male connector) for connecting an IC card.

When the IC card is inserted into an electronic device, both connectors are connected and the detection switch is closed on the IC card, and the electronic device determines whether the IC card is connected based on the state of the detection switch, and Data exchange is now started between the device and the IC card.

(Problems to be Solved by the Invention) In the above-mentioned electronic equipment, since a detection switch is provided to determine whether an IC card is connected, an extra detection switch and space are required, resulting in an increase in the size of the electronic equipment. However, if the IC card is frequently attached and detached over a long period of time, the actuating part of the switch will wear out, and the switch may malfunction, making it impossible to reliably determine whether the IC card is connected.

(Object of the Invention) An object of the present invention is to provide an IC card connection determination device for electronic equipment that can determine whether or not an FC card is connected with a simple configuration.

(Means for Solving the Problems) An IC card connection determination device for an electronic device according to the present invention provides an electronic device that includes at least a CPU and an IC card that is removably connected to the CPU. A voltage change detection input port is provided in the IC card connection part and connected to the constant voltage line, and when the IC card is connected to the CPU, the voltage change detection input port is connected to the constant voltage line on the IC card side. has connection terminals that connect to terminals of different voltage levels,
I based on the voltage level of the human powered boat for voltage change detection.
The C card is provided with a determining means for determining whether or not the C card is connected.
The PU executes processing based on the determination result of the determination means.

(Function) In the ICC card connection determination device for electronic equipment according to the present invention, when the IC card is not connected to the CPU, a constant voltage line is connected to the input port for voltage change detection connected to the connection part of the IC card. A voltage is applied.

Furthermore, when an IC card is connected to CPtJ, the connection terminal of the voltage change detection input port is connected to the terminal of the IC card, and a voltage different from the voltage of the constant voltage line is applied to the voltage detection input port.

The determining means determines whether the IC card is connected or not based on the voltage level of the voltage change detection input port, and the CPU executes processing based on the determination result of the determining means.

(Effects of the Invention) According to the IC card connection determination device for electronic equipment according to the present invention, as described above, the presence or absence of an IC card connection is determined based on the voltage level of the voltage change detection input port,
Since processing is executed based on the determination result, it is possible to omit the detection switch and its space, thereby preventing the electronic device from becoming larger and increasing its durability so that it can withstand long-term attachment and detachment operations. .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is a case in which the present invention is applied to an electronic typewriter to which an IC card equipped with RAM can be attached. R of card
This is designed to determine the voltage level of a battery for an AM data hack amplifier.

As shown in FIG. 1, the typewriter basically comprises a keyboard 1, a printing mechanism 2, a display mechanism 3, a control device C, and the like.

The keyboard 1 is provided with the following character symbol keys and function keys.

That is, as character symbol keys, alpha, 7 keys, numeric keys, various symbol keys, etc. are provided.

The function keys include a cursor movement key that moves the cursor on the display 7 of the display mechanism 3 vertically and horizontally, and a verify key that commands a spell check on input words.

In addition to the above, the keyboard 1 is also provided with a code key and various other function keys similar to a normal type-like keyboard, but since they are not directly related to the present invention, their explanation will be omitted.

The printing mechanism 2 includes a mechanical mechanism including a carriage, a drive motor thereof, a drive circuit thereof, a mechanical am for feeding printing paper, a drive motor thereof, a drive circuit thereof, a type wheel, a drive motor thereof, a drive circuit thereof, and It consists of a printing hammer, its drive solenoid, its drive circuit, etc.

The display mechanism 3 has a known configuration including a display 7 consisting of a two-row LCD (liquid crystal display) and a display controller 8 that outputs a drive signal to the display 7.

The control device C includes a CPU (Central Processing Unit) 4 equipped with an analog boat AN connected to an A/D converter;
It is composed of a ROM (read only memory) 5 and a RAM (random access memory) 6 connected to the CPU 4, and the CPU 4 is connected to a keyboard 1, a printing mechanism 2, and a display device via a data bus or the like. 013 is connected.

Note that the IC card IO is detachably connected to the CPU 4.

The ROM 5 is equipped with a program memory and a dictionary memory, and the program memory is configured to correspond to code data such as each character inputted from the keyboard 1 and code data of each function inputted from various function keys of the keyboard 1. a control program for controlling the printing mechanism 2 and the display mechanism 3, a spell check control program for spell check processing, a program for switching the analog input/output boat AN of the CPU 4 to a manual boat and reading the input voltage level thereof, and an IC card. 10, a program for clearing (erasing) the data contents of the dictionary memory 1), a control program for connection determination processing control, which will be described later, and the like are stored.

In the dictionary memory, for checking the spelling of words,
For example, data related to approximately 70,000 English words are stored sorted in alphabetical order like a normal dictionary.

The RAM 6 includes a general memory necessary for controlling the printing mechanism 2 and the display Vs mechanism 3, a word data memory for storing data of the word currently input for spell checking, and a type memory. A print data memory stores the data printed in the writer mode in correspondence with the print position, and the data is inputted or read from the text memory 96 in the memory mode and displayed on the display 7. A line buffer for storing character and symbol data including data, a text memory for storing input data as file data, and various memories for temporarily storing the results of arithmetic processing by the CPU 4 are provided.

The CPU 4 controls i1 when in typewriter mode.
Based on the program, each character or symbol corresponding to data input from a keyboard 3 is controlled to be printed on printing paper by a printing mechanism 2, and the printed data is sequentially stored in a print data memory in correspondence with a print position.

When the verify key on keyboard 1 is operated, the CPU
4 reads the spell check control program from the program memory, and stores the input word in the dictionary memory built into the ROM 5 or the dictionary memory 1) in the IC card 10.
A search (spell check) is performed to see if a word with the same precision is stored while checking each word in one of the dictionary memories.

Then, when there is no word in the dictionary memory that has the same meaning as the human-generated word, that is, when a spelling error is detected,
The CPU 4 notifies the operator of the spelling error by an alarm or the like.

Next, the present invention is characterized by connection determination processing control that determines whether or not the IC card 10 storing the dictionary memory 1) is connected to a typewriter, and executes processing according to the determination result. The configuration for determining the connection will be explained based on the circuit diagram in FIG.

A connector (shown in the diagram) provided on the typewriter for connecting the IC card 10 has at least a terminal 12 connected to a +5V line (constant voltage line) and a terminal 12 connected to the CPU 4.
A terminal 13 connected to the analog input/output boat AN of
A terminal 14 for grounding (earth) is provided.
The analog input/output port AN includes a resistor R0 and a diode D. The +5 ■ line is connected via.

When the IC card 10 is inserted into the typewriter, the terminal 1 is connected to the terminal (shown in the figure) of the IC card 10.
Terminal 15 connected to terminal 2, and terminal 16 connected to terminal 13.
and a terminal 17 connected to the terminal 14 are provided at least.

The terminal 15 is a PNP type transistor TR.

is connected to the emitter of the resistor R3, and the terminal 16 is connected to the emitter of the resistor R3.
, to the Vcc terminal of the dictionary memory 1) and the collector of the transistor TR+, and the terminal 17 is connected to the GND (ground) terminal of the dictionary memory, the emitter of the NPN transistor TR2, and the resistor R4. .

The transistors TR, -TR2 and the resistors R2, R1,
R4 is connected as shown.

Between the terminals 16 and 17 are a lithium battery (electromotive force: 3V) E and a Zener diode (constant voltage diode) D+ for backing up dictionary data in the dictionary memory 1).
are interposed in parallel.

Here, in the dictionary memory 1■ constituted by the RAM,
Similar to the dictionary memory of the ROM 5 of the typewriter, data related to about 70,000 French words are stored alphabetically for checking the spelling of words.

The diode D0 is provided to prevent the current of the lithium battery E from flowing in the +5 line direction when the typewriter is powered off with the IC card 10 attached to the typewriter. A Zener diode D having a Zener voltage of 3V is provided to prevent current corresponding to a voltage of 3V or more from flowing into the lithium battery E, which is a primary battery.

The resistances R, , R, and R2 are current reducing resistances, and resistances R1 and R2.
4 is a voltage dividing resistor, and transistors TR and TR2 are switching transistors.

The voltage level of the RAM at which the authenticity of the dictionary data in the dictionary memory 1) is guaranteed is 1.5 V or more (hereinafter referred to as guaranteed voltage).

Next, the operation when determining the IC card connection and determining the guaranteed voltage of the lithium battery E will be explained.

First, when the IC card 10 is not installed in the typewriter, a voltage of about 5 µ is applied to the analog input/output port AN of the CPU 4 via the resistor R0 and the diode D0.

On the other hand, the dictionary memory 1) of the IC card 10 has a resistor R1.
The dictionary data in the dictionary memory is stored and held by applying a voltage of about 3 cm through the dictionary memory.

Then, when the helifi key is operated from the keyboard 1, approximately 5* applied to the analog input/output port AN is detected, and the dictionary memory of the ROM 5 is searched for the input word.

Next, when the IC card 10 is installed in the typewriter and each terminal 12, 13, 14 is connected to the corresponding terminal 15, 16, 17, the transistor T R2 is activated by the voltage generated in the resistor R4, and a current is generated. flows in the direction of 12, and the transistor TR becomes conductive.

When the transistor TR, conducts, the current flows in the direction of i, and +5V from the terminal 15 is applied to the terminal V of the dictionary memo 1).
CC and resistor R1.

Then, the voltage level of the connection line a from the collector of the transistor TR to the resistor R1 is 5■, but the voltage level of the connection line A from the resistor R3 to the analog input/output boat AN via terminals 16 and 13 is 5. is equal to the voltage level of the connecting line C, that is, equal to the voltage level of the lithium battery E. At this time, the voltage difference between +5■ and the lithium battery E acts on the resistor R1.

In other words, the analog input/output boat AN is equipped with a lithium battery E.
3V is applied.

Then, when the verify key is operated from the keyboard 1, 3■ applied to the analog input/output port AN is detected, and it is determined that the IC card is connected.
Dictionary memory 1 of IC card IO for the input word
) is searched in the dictionary.

In this case, when the voltage level of the analog input/output port AN is 1.5V or less, the lithium battery E does not have a guaranteed voltage, so the reliability of the dictionary data in the dictionary memory 1) is not guaranteed, so the dictionary data is automatically is initialized to .

Next, a flowchart of connection determination processing control performed by the typewriter control device C will be explained with reference to FIG.

When the typewriter is powered on, this control is started, and the process moves to step 31 (hereinafter simply referred to as Sl, and the same applies to other steps), where initial settings are executed, and the process moves to S2.

In S2, the process waits for the key to be manually operated, and when the key is operated, the process moves to 53. In S3, it is determined whether or not a character/symbol key has been operated, and if the answer is Yes, the process moves to S4, and if the answer is No, the process moves to S5.

In S4, the input data is written into the text memory and word data memory of the RAM 6, and the process returns to S2. 32~S
4 is repeated and the input code data is sequentially written into the text memory and the word data memory.

In S5, it is determined whether or not the operated key is the Verify key, and if it is the Verify key (when checking spelling), the process moves to S6, and if it is not the Verify key, the process moves to 313, which corresponds to the operated function key. Then, the process returns from S13 to S2. In S6, C
The analog input/output port AN of PU4 is switched to the input port. In the above case, the CPU 4 reads the switching control program from the program memory of the ROM 5 to the input port. At step 37, it is determined whether the port voltage is approximately 5 V or not based on the voltage level of the analog input/output port AN. , when the voltage is about 5V, that is, when no IC card is installed, the process moves to S8, and when it is not about 5V, that is, when the IC card is not installed, the process moves to S8.
If the C card is installed, the process moves to S9. S8
At this point, the word written in the word data memory is searched for in the dictionary memory (inside the English word dictionary) of the ROM 5, and the process returns to S2.

In the above case, the CPU 4 searches the dictionary using the spell check control program, and if there is a misspelling, an alarm or the like is used to notify the operator of the spelling error. In S9, it is determined whether the boat voltage is 1.5V or less based on the voltage level of the analog input/output boat AN, and if it is 1.5V or less (when the lithium battery E does not have a guaranteed voltage), the process goes to 31). transition, and when it is larger than 1.5■, SI
Move to O. At step 310, a dictionary search is performed using the dictionary memory 1) (built-in French word dictionary) of the IC card 10, and the process returns to S2. In the above case, the CPU 4 searches the dictionary using the spell check control program, and if there is a misspelling, an alarm or the like is used to notify the operator of the spelling error. In Sll, since the authenticity of the dictionary data in the dictionary memory 1) is not guaranteed, the contents of the dictionary memory 1) are cleared. In the above case, the CPU 4 reads a program for clearing data contents from the program memory. In the next 312, r I CCard In1tialized'
message is displayed on the display 7, and the process returns from S12 to S2.

As explained above, one analog tsunobo)A
At N, it is possible to determine whether an IC card is connected or not based on the voltage level of the port AN, determine whether the voltage of the lithium battery E is guaranteed, and perform processing based on the determination results.

Incidentally, since the dictionary memory 1) of the IC card IO is a RAM, it can be used as a user dictionary in which data can be rewritten into a dictionary of another language or data can be written by the operator as needed. Furthermore, if the CPU 4 is constructed of a CMOS type, the power consumption of the lithium battery E can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of the control system of a typewriter, FIG. 2 is a circuit diagram in a state where an IC card is connected, and FIG. 3 is a flowchart of a routine for controlling connection determination processing. It is. 4...CPU (Central Processing Unit), 5...ROM (Read Only Memory), 6...RAM (Random Access Memory), IO...IC Card, 1
3.16...terminal, AN...analog input/output board,
C: Control device, E: Lithium battery.

Claims (1)

[Claims] (1) In an electronic device that includes at least a CPU and an IC card that is removably connected to the CPU, an input port for voltage change detection that is provided at the IC card connection part of the CPU and is connected to a constant voltage line. and a connection terminal for connecting the voltage change detection input port to a terminal on the IC card side having a voltage level different from the constant voltage line when the IC card is connected to the CPU, and a voltage of the voltage change detection input port. I based on level
An IC card connection determining device for an electronic device, comprising: a determining means for determining whether or not a C card is connected, wherein the CPU executes processing based on a determination result of the determining means.