JPH0744258A - Reactivating method for electronic equipment - Google Patents

Abstract

PURPOSE:To release the hang-up state of an electronic equipment in which a CPU is integrated only when a specific device is mounted. CONSTITUTION:When an IC card is mounted on an IC card reader, and a power source input terminal is set as +5V (S11-S12), the CPU of the IC card sets and SEND signal, outputted through the IC card reader to the I/O controller of the electronic equipment, to 'on' (S13). Then, after the lapse of 10msec, the CPU turns 'off' the SEND signal (S14-S15), and discriminates whether or not a RECEIVE signal outputted by the I/O controller is turned 'on' (S16). Then, when it is not turned 'on', the CPU judge that the hang-up state of the electronic equipment is obtained, and sets a RESET signal outputted to the CPU of the electronic equipment main body and a sub-CPU in the I/O controller to 'on' (S17). Thus, the electronic equipment can be reactivated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device in which, when the electronic device is hung up for some reason, the hung-up condition is not released unless a specific device is used. Regarding how to restart.

[0002]

2. Description of the Related Art Recently, many electronic devices have a built-in microcomputer due to their multi-functionality. Such an electronic device uses a program stored in a ROM (Read Only Memory) as a CP.
The multi-functionalization is realized by execution by a U (Central Processing Unit).

However, in such a microcomputer-embedded electronic device, the program execution operation of the CPU becomes abnormal due to static electricity or the like (for example,
The program runs out of control and the program doesn't stop),
In some cases, it becomes a so-called hang-up state where data cannot be input. In addition, even if the electronic device is illegally tampered with, it may be in a hang-up state.

[0004]

Conventionally, in order to cancel the above-mentioned hang-up state, the switch of the normal power supply is once turned off and then turned on again, or the AC outlet is once unplugged and then plugged again. I should have done the operation.

However, in some types of electronic equipment, it may be a problem if the hang-up is canceled by the above-described known operation known to anyone. For example, if you do not want to be used by others without permission, or if important data related to personal privacy or confidential matters is stored in an external storage device or non-volatile memory in an electronic device that has a data display function, etc. Is.

In the above case, it is desirable that the hang-up be released by a special operation known by the owner. The present invention has been made in consideration of the above-mentioned reasons.
A method for restarting an electronic device in which the electronic device incorporating U is in a hung-up state and the hung-up state is canceled and the electronic device can be restarted when a specific device is attached Is to provide.

[0007]

According to the present invention, a CPU is built-in, and when an electronic device which realizes a predetermined function by executing a program in which the CPU is installed in advance is in a hang-up state, The present invention relates to a method for restarting an electronic device.

When a specific device is attached to the electronic device, the specific device tries to transmit / receive a signal to / from the electronic device by a predetermined method, and when the signal is successfully transmitted / received, , CP of the electronic device from the specific device
It is characterized in that U is reset and the electronic device in the hang-up state is restarted.

The specific device is, for example, an IC card, and the electronic device is, for example, an IC card reader and an I / O to which the IC card reader is connected in addition to the CPU of the main body.
It is an electronic device including a controller. The I / O controller includes, for example, a CPU (sub CPU), and the I / O controller performs various I / O control by the sub CPU. Then, the IC card is replaced with the I
When mounted on the C card reader, the IC card sends and receives data to and from the I / O controller via the IC card reader.
If the I / O controller is operating normally, I
The / O controller returns a response signal to the IC card at a time other than the predetermined time.
The transmission signal output from the C card cannot be detected and the response signal is not returned to the IC card. If the IC card cannot receive the response signal for a predetermined time or more, the IC card determines that the IO controller is in the hung-up state, and the CPU of the electronic device main body and the sub unit of the I / O controller are connected via the IC card reader. The CPU is reset and the electronic device is restarted.

[0010]

The operation of the present invention is as follows. When the specific device is attached to an electronic device, the specific device transmits a signal for a response to the electronic device in a predetermined method. At this time, if the electronic device is in a hung-up state, the electronic device cannot detect the input of a signal from the specific device and cannot return a response signal to the signal to the electronic device.

In this case, the specific device determines that the signal transmission / reception with the electronic device has been unsuccessful, and resets the CPU of the electronic device. Therefore, by disabling the resetting of the CPU by a method other than the above, when a specific device is attached to an electronic device, the CPU of the electronic device in a hung-up state is reset to cause the electronic device to be reset. The vessel can be restarted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, when an electronic device equipped with an IC card reader is in a hang-up state, an IC card is attached to the IC card reader to cancel the hang-up state.

FIG. 1 shows an IC card 10 according to this embodiment.
It is a block diagram showing an internal circuit configuration. In the figure, the CPU 12 reads / writes information from / to an electronic device via an IC card reader 180 described later, detects the electronic device when the electronic device is in a hung-up state, and detects the hang-up state. In order to release it, the CPU in the electronic device is reset.

The ROM 14 stores the program executed by the CPU 12 and various data. The ROM 14 is, for example, an EEPROM (Electr
It consists of a non-volatile memory that can read / write data, such as an Erasable Programmable ROM.

This IC card 10 has Vcc, RST,
It has five types of terminals: RCV, SND, and I / O. The functions of these terminals are shown below. Vcc: Power supply voltage (+ 5V) input terminal for CPU12 operation RST: Reset signal output terminal RCV: RECEIVE signal input terminal SND: SEND signal output terminal DB: Data serial Input / Output Terminal Next, in FIG. 2, the IC card 10 is mounted. It is a block diagram showing a circuit configuration of an electronic device including an IC card reader 180.

In the figure, a CP for controlling the entire equipment
ROM 130, RA to U110 via bus 120
The M140, the display controller 150, and the I / O controller 160 are connected.

ROM (Read Only Memory) 130
Stores a program executed by the CPU 110. RAM (random access memory) 140 is
It is used as a work area of the CPU 110 and an input / output buffer for data input / output via the I / O controller 160.

The display controller 150 controls the display section 170, which is a liquid crystal display or the like, to display the display section 17.
A predetermined screen is displayed on 0. I / O controller 16
0 controls input / output of data to / from an external storage device such as a floppy disk in response to a control signal from the CPU 110. This control is performed by the built-in CPU 162 (hereinafter referred to as the sub CPU 162). It is also connected to the IC card reader 180.

The IC card reader 180 is a device to which the IC card 10 is attached, and is the IC card 100 and I
Controlling transmission and reception of signals between the / O controllers 160. That is, SEND input from the IC card 10
The signal is output to the I / O controller 160, and at the same time, the I / O controller 160 outputs the RECEIVE signal transmitted in response to the SEND signal to the IC card 10. Further, when the IC card 10 receives a reset signal (RESET signal) from the IC card 10, the IC card reader 180 resets the CPU 110 of the electronic device 100 and the sub CPU 162 in the I / O controller 160 to reset them. A signal (RESET signal) is output. Further, the I / O controller 160 is supplied with a power supply voltage of +5 V from the power supply unit of the electronic device 100 main body, and also supplies this voltage to the IC card 10.

Next, the operation when the IC card 10 is attached to the IC card reader 180 of the electronic device 100 having the above-mentioned configuration will be described with reference to the flowcharts of FIGS.

FIG. 3 shows the CPU of the IC card 10 when the IC card 10 is attached to the IC card reader 180.
12 is a flowchart illustrating the operation of No. 12. If the electronic device 100 is powered on when the IC card 10 is attached to the IC card reader 180, the power supply voltage is supplied to the terminal Vcc of the IC card 10 via the IC card reader 180, and Power on (POWER
It is turned on, and the operation of the CPU 12 of the IC card 10 is started (S11).

The voltage of the terminal Vcc of the CPU 12 is + 5V.
When rising to + 5V (S12, YES), the SEND signal transmitted from the terminal SND to the I / O controller 160 via the IC card reader 180 is set to ON (S13). ). Then, the SEND signal is kept on for 10 msec (S14, S15).

In this embodiment, if the CPU 110 of the electronic device 100 main body and the sub CPU 162 in the I / O controller 160 are in a normal state, within 10 msec after the I / O controller 160 turns on the SEND signal. REC input to the terminal RCV of the IC card 180
The EIVE signal is designed to be turned on.

The CPU 12 receives the RECEI signal input to the terminal RCV 10 msec after the SEND signal is turned on.
It is checked whether the VE signal is on (S16), and if it is not on (S16, NO), the RESET signal output from the terminal RESET is set to on (ON), and the RESET signal is sent to the IC card reader 180. Via the reset signal input terminals of the CPU 110 of the electronic device 100 main body and the sub CPU 162 in the I / O controller 160, the CPU 110 and the sub CPU 162 are reset, and the electronic device 100 is restarted (S17).

As described above, the IC card 10 receives the I / O controller 160 via the IC card reader 180 even if 10 msec has elapsed after the SEND signal was turned on.
If the output RECEIVE signal does not turn on,
It is determined that the CPU 110 of the electronic device 100 or the sub CPU 162 of the I / O controller 160 is in the hung-up state, and the CPU 110 and the sub CPU 162 are
To reset.

On the other hand, in step S16, RECEIV
If E signal is on, IC card reader 180
Read data from IC card 10 via
A predetermined normal process such as writing data to the C card 10 is performed (S18).

Next, FIG. 4 is a flow chart for explaining the operation of the sub CPU 162 in the I / O controller 160 when the SEND signal input from the IC card reader 180 is turned on.

The CPU 12 of the IC card 10 uses the terminal SND
That is, when the SEND signal is turned on (corresponding to step S13 in the flowchart of FIG. 3), an external interrupt is applied to the terminal iRQ in the I / O controller 160 via the IC card reader 180.

At this time, if the sub CPU 162 in the I / O controller 160 is operating normally, the sub CPU
This interrupt causes the IC card reader 162 to execute the interrupt processing routine shown in the flowchart of FIG.
The RECEIVE signal output to 80 is set to ON (S21).

As a result, the input terminal RCV of the IC card 10, that is, RACE, is passed through the IC card reader 180.
SE that the IVE signal is output from the IC card 10
It is turned on within 10 msec after the ND signal is turned on.

On the other hand, the CPU 110 of the main body of the electronic device 100
Alternatively, the sub CPU 162 in the I / O controller 160
Is in a hang-up state, the sub CPU 162 cannot detect the interrupt input to the terminal iRQ. Therefore, in this case, the terminal R of the IC card 10
The RECEIVE signal input to the CV does not turn ON.

Therefore, the CPU 12 of the IC card 10
Checks whether or not the RECEIVE signal is set to ON (ON) 10 msec after the SEND signal is turned ON, and the CP of the electronic device 100 main body is checked.
Sub-CP in U110 or I / O controller 160
It is possible to detect whether U162 is in the hang-up state.

Next, FIG. 5 shows the CPU 110 of the main body of the electronic device 100 corresponding to when the RESET signal output from the terminal RST of the IC card 10 is set to ON in step S17 of the flowchart of FIG. And I /
6 is a flowchart illustrating an operation of a sub CPU 162 of the O controller 160.

As described above, the terminal R of the IC card 10
When ST, that is, the RESET signal is set to ON (corresponding to step S17 in the flowchart of FIG. 3), it is input to the CPU 110 of the electronic device 100 main body and the sub CPU 162 in the I / O controller 160 via the IC card reader 180. RESET signal turned on (O
N) and the CPU 110 and the sub CPU 162.
Executes the processing shown in the flowchart of FIG.

That is, the CPU 110 has the ROM 130.
Execution from a predetermined address of the RAM 140 and the display controller 1 by executing an initialization routine or the like.
Initialize 50. In addition, the sub CPU 162 is also I /
The O controller 160 is initialized (S31).

After that, a normal predetermined operation is started (S32). In this way, the CP of the electronic device 100 main body
Sub CPU in U110 and I / O controller 160
162 returns the electronic device 100 to the initial state when the RESET signal is turned on, and the electronic device 100
To restart.

In the above embodiment, the SEND signal and RE
Although the hang-up state of the electronic device 100 is detected by transmitting / receiving the CEIVE signal, the present invention is not limited to such a method, and the electronic device is in the hang-up state by exchanging predetermined data. Whether or not it may be detected.

The electronic equipment to which the present invention is applied is not limited to the one provided with the I / O controller as in the above-mentioned embodiment, but can be applied to all electronic equipment having a built-in CPU. It is something.

Further, the device mounted on the electronic device is also an IC
The device is not limited to the card, and may be any device as long as it is detachable and can send and receive signals to and from the electronic device when it is mounted.

[0040]

As described above, according to the present invention,
When a certain device is attached to an electronic device and the transmission and reception of a signal between the certain device and the electronic device by a predetermined method are not successful, the above-mentioned specific device is the CPU of the electronic device. Is reset, so that the electronic device in the hung-up state can be restarted when the specific device is attached.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an IC card.

FIG. 2 is a block diagram showing a circuit configuration of an electronic device.

FIG. 3 is a flowchart illustrating an operation of a CPU of an IC card when the IC card is mounted on an IC card reader of an electronic device.

FIG. 4 is a sub C in the I / O controller of the electronic device when the SEND signal output from the IC card is input.
It is a flowchart explaining operation | movement of PU.

FIG. 5 is a flowchart illustrating an operation at the time of resetting the CPU of the electronic device and the sub CPU in the I / O controller.

[Explanation of symbols]

 10 IC card 12 CPU 14 ROM 100 Electronic device 120 Bus 130 ROM 160 I / O controller 162 Sub CPU 180 IC card reader

Claims (1)

[Claims] 1. A method of restarting an electronic device having a built-in CPU, the electronic device realizing a predetermined function by executing a program built in the CPU when the electronic device is hung up. When a specific device is attached to the electronic device, the specific device attempts to send and receive a signal to and from the electronic device by a predetermined method, and when the signal is successfully sent and received, The CPU of the electronic device is reset from the device to restart the electronic device in the hung-up state, the method of restarting the electronic device.