JPH0522188A - Mobile body communication equipment - Google Patents

Abstract

PURPOSE:To eliminate the trouble that the line connection state before battery replacement cannot be restored by erasing of data brought about by communication to a base station at the time of replacing the battery during speech. CONSTITUTION:A voltage monitor means 16 which detects that the output voltage of a battery 14 is lower than a determined value, a storage means (RAM) 11 where data required for operation is stored, and a non-volatile storage means (EEPROM) 13 are provided. If it is detected by the voltage monitor means 16 that the output voltage of the battery 14 is lower than the preliminarily determined value, a control means (microcomputer) 10 is operated to transfer data stored in the storage means 11 to the non-volatile storage means 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device such as a car phone and a mobile phone, and more particularly to a power supply for these mobile communication devices.

[0002]

2. Description of the Related Art In a mobile communication device such as a mobile phone, a rechargeable battery is usually used as its power source. However, when the battery level becomes low, the output voltage of the battery drops and the circuit operation becomes unstable. become. Therefore, the remaining battery level is estimated by monitoring the output voltage of the battery, and when the remaining battery level is low, a message prompting the user to replace the battery, such as an LCD, is displayed.
It is desirable to display it on a display device or give a warning sound. However, such a warning is activated only when the voltage drops to the minimum voltage that guarantees the operation of the device, and the battery may not be replaced in time if the replacement battery is not ready.

Therefore, for example, in Japanese Unexamined Patent Publication (Kokai) No. 2-127827 (H04B 7/26), at the user's will at any time when the battery voltage has not dropped near the minimum voltage that can guarantee a predetermined function. A receiver configured to check the remaining battery capacity of a wireless selective call receiver is described.

However, in this conventional technique,
The user must always be aware of the remaining battery level, and if the switch that indicates the battery capacity has been used for a long time without being operated, the battery voltage will not function as specified. You will not be warned if the voltage does not drop close to the minimum voltage that can be guaranteed.

Further, when the battery is replaced, power supply to the storage device storing various communication data is also stopped,
At the same time as replacing the battery, the power is cut off and the stored contents disappear, and the communication protocol with the base station is restarted from the initial state.
For example, if you replace the battery during a call, you will have to reconnect the line.
In other words, there is a drawback that it is necessary to perform work such as making a call and waiting for the other party to make a call.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art. Even if the battery is replaced during a call, the data generated by communication with the base station is erased and the battery is (EN) Provided is a mobile communication device having no problem that the line connection state before exchange cannot be restored.

[0007]

According to the present invention, in a mobile communication device such as a mobile phone, a voltage monitoring means for detecting that the output voltage of a battery is lower than a predetermined value, and data necessary for operation are provided. Storage means for storing, non-volatile storage means, and when the voltage monitoring means detects that the output voltage of the battery is below a predetermined value, the data stored in the storage means is stored in the non-volatile storage means. It is characterized by having a control means that operates so as to transfer.

[0008]

According to the present invention, when it is detected by the voltage monitoring circuit that the voltage of the battery has dropped below the predetermined value, the control means automatically detects the data necessary for the communication operation stored in the storage means. It is temporarily saved in the non-volatile storage means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a mobile communication device according to the present invention. In the figure, 1 is a transmitting / receiving antenna, 2 is an amplifying / demodulating circuit for amplifying and demodulating received radio waves, 3 is a received signal processing circuit for processing various data included in the received radio waves, and 4 is modulation and amplification for transmitted radio waves. A modulation / amplification circuit, 5 is a transmission signal processing circuit for adding various data to a transmission radio wave, and 6 is an analog signal processing circuit, which performs compression, expansion, amplification and the like of a voice signal. Further, 7 is a ringer speaker, 8 is a receiving speaker, 9 is a transmitting microphone, 10 is a microcomputer, 11 is a readable / writable memory (RAM) for storing various data,
Reference numeral 12 is a read-only memory (ROM) in which programs and constants are stored, and 13 is a non-volatile memory (EEPROM) whose contents are not erased even when the power is turned off.
Reference numeral 14 is a battery that can be attached to and detached from the mobile phone body, and 15 is a power supply voltage stabilizing circuit that supplies a stable voltage to each block even if the voltage of the battery fluctuates. Reference numeral 16 is a voltage monitoring circuit for monitoring the output voltage of the battery 14 and notifies the microcomputer 10 when the output voltage of the battery becomes lower than a predetermined value. Also, 17
Is a keypad, and the microcomputer 10 detects a key input by accessing it. 18 is an LCD
It is a display device and displays various information. Reference numeral 19 is a power switch.

Now, the operation of the microcomputer 10 will be described in detail. For the amplification / demodulation circuit 2, the frequency of the radio wave to be received is specified, and information such as the intensity of the radio wave is received. For the reception signal processing circuit 3,
Receives various message information carried on the received radio waves. For the modulation / amplification circuit 4, the frequency of the radio wave to be transmitted and the intensity of the radio wave are designated. For the transmission signal processing circuit 5, the data to be transmitted is specified. Further, by accessing the 17 keys, the key pressed by the user can be identified. The microcomputer 10 processes this key information to realize various telephone functions such as making a call and receiving a call. Reference numeral 18 denotes a liquid crystal display device, which displays various information such as the input telephone number and the strength of radio waves. The RAM 11 stores various information when the microcomputer 10 performs processing. The ROM 12 stores programs and constants that are processing procedures of the microcomputer 10. EEPRO
M13 stores information that needs to be retained even after the power is turned off. For example, information about the speed dial, your own telephone number, etc. are stored. In the present invention, part or all of the content of the RAM 11 is EEPRO.
Since the data is stored in the M13, the storage capacity of the EEPROM 13 needs to be increased accordingly. Further, the voltage monitoring circuit 16 recognizes a decrease in the output voltage of the battery.

2 and 3 are flowcharts of the present invention, and the microcomputer 10 performs processing in accordance with the flowcharts. In Figure 2, the battery level is low,
A portion for saving the contents of the RAM 11 to the EEPROM 13,
In FIG. 3, the power source is connected after the battery is replaced, and the EEPROM 1
3 is a flowchart of a part for recovering information from 3 to the RAM 11 and reproducing a call state.

First, FIG. 2 will be described. When the microcomputer 10 recognizes from the voltage monitoring circuit 16 that the output voltage of the battery has dropped below the predetermined value, the microcomputer 20
Transfer processing to. In step 21, it is determined whether or not a call is in progress. If a call is in progress, the process proceeds to step 22 and the "call in progress power cut flag" is set. After that, the process proceeds to 23, and the contents of the RAM 11 including the "power-off flag during call" are transferred to the EEPROM 13. After that, in step 24, a message prompting battery replacement, such as "CHANGE BATTERY", is displayed on the LCD display device 18, and a warning sound is output from the ringer speaker 7. After that, the process proceeds to 25, and it is determined whether the call is in progress again. If the call is in progress, the process proceeds to 26. If no call is in progress, the process proceeds to 29 and returns to the address of the jump source. At 26, it is determined whether or not the END key is pressed, and if it is pressed, the process proceeds to 28 to perform a call ending process, and then proceeds to 29. Again 27
It is determined that the release order has been received at, that is, the other party who is talking has hung up, and if the other party hangs up, the process goes to 28 to end the call, and then goes to 29 and the address of the jump source. Return to.

Next, the flowchart of FIG. 3 will be described. When you replace the battery and connect the power supply, first 30
Will jump to. The hardware is initialized in 31 and is set in 22 in 32 and the EEPROM 13 is set.
Check the "power-off flag during call" stored in, and go to 39 if set, 3 if not
Go to 3. The parts 33 to 38 are part of the communication protocol of the mobile phone, and the parts up to the call are mainly omitted here. Reference numeral 33 is a process for initialization, which scans a dedicated control channel and updates overhead information. At 34, a channel for paging is selected. Reference numeral 35 monitors whether there is an order from the base station, a call (paging), or a calling operation (origination) by the user. When paging occurs, the process proceeds to 36. When origination occurs, the process proceeds to 37, and the call operation (conversation) of 38 is started. In 36 and 37, the channel is changed to the call channel (voice channel) according to the order from the base station, so that the channel is already the voice channel in the call operation of 38.

By the way, at 39, "power-off flag during call"
In step 40, the information saved in the EEPROM 13 is restored in the RAM 11, and in step 41, the transmission / reception channel and the transmission output level are set in accordance with the information. As a result, each part of the hardware returns to the state before the power was turned off. Then, the call operation of 38 is started. In other words, after the normal power supply connection work, it is possible to return to the call state without performing the steps 33 to 36 and 37 necessary for transitioning to the call state. You can continue the call.

[0015]

According to the present invention, it is possible to continue a call even if the battery is exhausted and the battery is replaced during the call.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

 10 Control Means (Microcomputer) 11 Storage Means (RAM) 13 Nonvolatile Storage Means (EEPROM) 14 Battery 16 Voltage Monitoring Means

Claims (1)

Claim: What is claimed is: 1. In a mobile communication device such as a mobile phone, voltage monitoring means for detecting that the output voltage of a battery has fallen below a predetermined value, and data necessary for operation are stored. The storage means, the non-volatile storage means, and the data stored in the storage means are transferred to the non-volatile storage means when it is detected by the voltage monitoring means that the output voltage of the battery falls below a predetermined value. A mobile communication device having a control unit that operates as described above.