JPH04127655A - Mobile telephone system - Google Patents

Abstract

PURPOSE:To prevent a talking time display from being deviated from an actual talking time by backing up clock information on the occurrence of momentary interruption of a power supply. CONSTITUTION:The telephone set is provided with a backup power supply section 4 continuing power supply regardless of momentary interruption, a display section 3 displaying a talking time of the telephone set, a RAM 12 storing the display content to the display section 3 and a timer 14 counting a talking time. Then an IO 13 is provided, which gives the result of time count by the timer 14 to the RAM 12 and is an input output means to give the result of output of a clock circuit section 2 to the RAM 12 on the occurrence of momentary interruption of the power supply of the telephone set. The RAM 12 and the clock circuit section 2 are backed up by the backup power supply section 4 and the content of the RAM 12 is backed up even during the momentary interruption and the counter of the clock circuit section 2 is in operation. Thus, even when momentary interruption takes place during the talking, the deviation of the talking time display from the actual taking time is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to means for measuring talk time of a car telephone device.

〔overview〕

The present invention is a means for measuring talk time of a car telephone device, which backs up clock information in the event of a momentary power outage, thereby making it possible to prevent the call time display from being out of sync with the actual call time. .

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of a conventional car telephone device. Control unit 1 is CP UIQ, R'0M11, RA
It is composed of M12, 013, timer 14, and reset signal generating section 15, and display section 3 is connected to 1013, and can display the call time. The RAM 12 is backed up by a backup voltage #N4, and the contents of the RAM are retained even in the event of a momentary power outage.

Next, the operation of the control section 1 will be explained with reference to the flowchart shown in FIG. Process 1 of step A is the process after the CPU'J set is released, and in step B, which performs internal initial settings, it is determined whether or not there is a recovery from a momentary interruption, and if it is, the process moves to step C. If not, proceed to step E. Step C is a process for determining whether a momentary interruption has occurred during a call. If there is a momentary interruption during a call, a call recovery process is performed in step D, and the process moves to step H. Step E consists of processes 3 to n, and includes processes such as line connection processing for the car telephone device and man-machine interface processing for the operation section and display section 3. In step F, it is determined whether the call has started, and if the call has started, the call time T is determined in step G. is initialized to "0" and stored in the RAM 12. Start the timer in step H, and until the timer ends,
In step L, it is determined whether or not a call is in progress, and processing 2 (step M) for in-call processing is performed. When the timer expires, the call time TcO value is incremented by "1" in step J and stored in the RAM 12 again. The call time is displayed in step H and the process returns to step H. If the call ends after completing the step, the process returns to step E.

[Problem to be solved by the invention]

As described above, in conventional car telephone devices, as a means for measuring call time, a timer that stops counting during reset is used to count call time by software. Therefore, if a momentary power outage occurs in the control unit due to actions such as starting the engine during a call or replacing the battery in a portable car phone, the control unit will be reset and the hardware timer and There is a difference between the actual call time when the software is stopped and the call time displayed by the car telephone device, which has the disadvantage of impairing the reliability of the call time display.

SUMMARY OF THE INVENTION An object of the present invention is to provide a car telephone device in which the call time display does not deviate from the actual call time even if a momentary interruption occurs during a call.

[Means to solve the problem]

The present invention provides a backup power supply unit that is provided separately from the device power supply and continues to supply power even if the device power supply is momentarily interrupted;
A display unit that displays the talk time of the device, a RAM that receives power from the backup power source and stores the content displayed on the display unit, and a RAM that measures the call time and is being reset due to a momentary power outage of the device. In the car telephone device, which is equipped with a timer that stops measuring the talk time, the clock circuit section receives power from the backup power supply section to measure and calculate the call time, and the timer's timing results are shown above. Self RA
The present invention is characterized in that it includes an input/output means for supplying the time measurement result of the clock circuit section to the RAM when the apparatus power supply is momentarily cut off.

[Effect]

The timer of conventional devices does not start the engine or start the engine during a call.
When replacing the battery, etc., a momentary power outage occurs, which causes the timer to be reset and stop counting, so that the actual call time is not displayed. A circuit will be installed to back up clock information in the event of a momentary power outage.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. As shown in FIG. 1, the control unit 1 includes CP Ulo, R
It is composed of OMII, RAM 12, l013, timer 14, and reset signal generating section 15, and I013 is connected to clock circuit section 2 and display section 3. R.A.
M12 and the clock circuit section 2 are backed up by the backup power supply section 4, and even during a momentary power outage, the RAM
The contents of 12 are retained, and the counter of the clock circuit section 2 is operating.

That is, this embodiment includes a backup power supply section 4 that is provided separately from the device power supply and continues to supply power even if the device power supply is interrupted, a display section 3 that displays the talk time of the device, and a backup power supply section 4. receives power from the display unit 3.
and a timer 14 that measures the call time and stops measuring the call time during a reset due to a momentary power outage of the device. , a clock circuit section 2 that receives power supply from the backup power supply section 4 and measures and calculates the call time.
and gives the timing result of the timer 14 to the RAM 12,
In the event of a momentary power failure of the device, the timing results of the clock circuit section 2 are stored in the RAM.
■013 which is an input/output means for supplying to 12.

Next, the operation of the control section will be explained using the flowchart of FIG. 2.

Process 1 in step A is a process after the CPU 10 is reset and performs internal initial settings. In step B, it is determined whether the reset is canceled due to recovery from a momentary interruption or due to power on, and if the reset is canceled due to recovery from a momentary interruption, the process moves to step C, otherwise, step E
Proceed to processing.

Step C is a process for determining whether a momentary interruption has occurred during a call. If there is a momentary interruption during a call, a call recovery process is performed in step D, and the process moves to step I. Otherwise, the process moves to E. Step E consists of processes 3 to n, which are conventional processes such as line connection processing for the car telephone device and man-machine interface processing for the operation section and display section 3. In step F, it is determined whether or not a call has started, and if the call has started, the current time is read out from the clock circuit section 2 in step G. Here, let T be the call start time. The data T at the time read out in step H is retained even if a momentary interruption occurs.
Store in M12. In the process of step (2), the current clock is read and set to "T8". In the process of step J, the call time Tc is calculated by subtracting the call start time T from the current time TN, and the call time Te is displayed on the display section 3 in the process of step J. Step M
) and return to step ■. When the call ends, the process returns to step E. If a momentary interruption occurs during a call, the process proceeds to steps A, B5C5D, I, and J in order to obtain the correct call time Tc.

〔Effect of the invention〕

As explained above, the present invention counts the time even in the event of a momentary power outage using the backup power supply unit that is supplied regardless of whether the power is turned on or off, reads out this clock information, and backs up the clock information in the event of a momentary power outage. This has the effect that even if a momentary interruption occurs during a call, the call time display does not deviate from the actual call time.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the control operation of the embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of a conventional example. FIG. 4 is a flowchart showing a conventional control operation. DESCRIPTION OF SYMBOLS 1... Control part, 2... Clock circuit part, 3... Display part, 4... Backup power supply part, 10... CPU, 1
1...ROM, 12...RAM, 13...I○,
14...Timer, 15...Reset signal generator.

Claims (1)

[Scope of Claims] 1. A backup power supply unit that is provided separately from the device power supply and continues to supply power even if the device power supply is momentarily interrupted; a display unit that displays the talk time of the device; and from the backup power supply unit A car telephone device equipped with a RAM that receives power supply and stores the display contents on the display section, and a timer that measures the call time and stops measuring the call time during a reset due to a momentary power outage of the device. , a clock circuit unit that receives power from the backup power supply unit to time and calculate the call time; the time measurement result of the timer is provided to the RAM; and when the device power supply is momentarily cut off, the time measurement result of the clock circuit unit is A car telephone device comprising input/output means for supplying data to the RAM.