JPS6046411A - Integrating device - Google Patents

Abstract

PURPOSE:To eliminate the need for a backup battery by storing ROM with data integrated so far when electric power is not supplied any more. CONSTITUTION:When a power switch 2 is turned on, a control part 42 transfers the contents of EEPROM (ROM where integrated data is readable and writable) 5 to a memory 43. A counter 41 counts the time at specific intervals of time, and the count result and the contents of the memory 43 are added together by an adding circuit 44, whose result is stored in the memory 43 and also displayed on a display device 6. When the power switch 2 is turned off and the output of a power source circuit 3 decreases to a specific value, an output signal appears at a terminal 3c to allow an interruption to the control part 42. The control part 42 writes the data from the memory 43 in EEPROM5 before the voltage supplied to a terminal 42a drops to the 2nd specific value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an integrating device that adds data during device operation.

[Prior art]

Generally, there are many demands for data integration, and they are used in various applications such as automobile distance meters and working machine operating time meters. These devices have traditionally been constructed of mechanical counters, but in recent years there has been a trend towards electronic counters in order to make them smaller and more economical. In this case, since it is necessary to store the integrated data even when the power is turned off, a RAM backed up by a battery is normally used to store the data.

However, since the backup battery is an auxiliary power source, it is easy to maintain it loosely, and if you forget to replace it regularly, it will run out of capacity and the data in RAM will be lost, making it impossible to perform integration operations. It had the disadvantage of being stored away.

[Object and structure of the invention]

Therefore, an object of the present invention is to provide an integration device that does not require a backup battery.

In order to achieve such an object, the present invention stores data accumulated up to + when power is no longer supplied in a writable and readable ROM (hereinafter referred to as EEP-ROM). . Hereinafter, the present invention will be described in detail using drawings showing embodiments.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of an integrating time meter constructed using the present invention. In the figure, 1 is a battery;
2 is an ignition switch, 3 is a power supply circuit, 4 is a control circuit, 5 is an EEPROM%, and 6 is a display. The power supply circuit 3 sends out a voltage of 16 volts from the terminal 3b when power is supplied to the terminal 3&, and after the power supplied to the terminal 3a is cut off, the output voltage changes as shown in FIG. K is set to decrease. If the voltage sent from terminal 3b does not exceed 8 volts, a power-off signal is generated from terminal 3c until the voltage reaches 5 volts. The time T required to reach the bolt is configured to be 500 milliseconds or more.

The control circuit 4 includes a counter 41, a control section 42, a memory 43,
The control section 42 is composed of an adder circuit 44 and a terminal 4.
When the 2aK power is supplied, the data in the EEP-ROM 5 is stored in the memory 43 and the counter 41 starts counting. Then, each time the count of the counter 41 progresses, the adding circuit 44 adds the data and the data of the memory 43.
, the addition result is supplied to the display 6 for display, and is supplied to the memory 43 for data rewriting.

Note that the counter 41 is designed to count time. Further, the control section 42 writes the data in the memory 43 to the EEFROM 5 when the terminal 42b K signal is supplied.

The operation of the apparatus configured as described above will be explained using the flowchart shown in FIG. First, when the switch 2 is turned on, power is supplied to the terminal 42a of the control section 42, so the control section 42 goes to step 1o.

As shown in FIG. 3, data in the EEPROM 5 is transferred to the memory 43. And this data is used in step 1
The signal is supplied to the display 6 and displayed as shown at 01. Further, as shown in step 102, the data in the EEFROM 5 is erased.

Thereafter, when the time count of the counter 41 advances by one count as shown in step 103, the count result and the data in the memory 43 are added together in the adder circuit 44 as shown in step 104. Then, the addition result is step 10
After being written into the memory 43 as shown in step 5, it is supplied to the display 6 and displayed as shown in step 106.
Flow returns to step 103.

Thereafter, the flow cycles through steps 103 to 106, and each data is updated and integrated each time the time count progresses. When the switch 2 is turned off, the output voltage of the power supply circuit 3 decreases as shown in FIG. Since the control unit 42 is supplied with the
2 performs an interrupt operation as shown in FIG.
Memory 4 as shown in step 107 for a period of 0 milliseconds.
Write the data of 3 to EEFROM5.

As a result, the data accumulated during device operation is transferred to switch 2.
It is stored and retained in the EEFROM 5 even after it is turned off. And when switch 2 is turned on again, EEFR
Since the data stored in OM5 is read out as shown in step 100, the data can be retained without battery backup when the power is turned off.

It is said that EEPRQM can be erased and written approximately 10,000 times. For this reason, even if an hour meter as shown in Figure 1 is installed in a car and the engine is started and stopped three times a day, the power will be turned on and off approximately 1,000 times a year, so it will last for nearly 10 years. Since the EEFROM can be used for a period of , this value is sufficient for practical use.

In addition, although the above embodiment described the integrating time meter,
The present invention is not limited to this, but can be applied to distance meters and anything else that requires integration.

〔Effect of the invention〕

As explained above, since the device according to the present invention writes the accumulated data up to that point in the EEPROM when the power is cut off, the accumulated data can be retained without backing up even when the power is cut off, and maintenance of the backup battery is possible. This has the effect that it becomes unnecessary.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an hour meter constructed by applying Hato's invention, Fig. 2 is a graph showing the output voltage characteristics of the power supply circuit in Fig. 1, and Fig. 3 is a flowchart of the device shown in Fig. 1. be. 3...power supply circuit, 4...control circuit, 5.fight/fist-
EEPROM% 6 "Fist Q/Display, 41...Counter, 42...Control unit, 43...Memory, 4
4...Addition circuit. Patent Applicant G-Eco Co., Ltd. Agent Policy Researcher Yamakawa (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 3 +01 (b1

Claims (1)

[Claims] It has a power supply circuit that generates a predetermined voltage while power is being supplied, and when the power supply is cut off, the voltage gradually decreases and generates a power-off signal, and a power supply circuit that can be written and read immediately. When power is supplied from the memory and the power supply circuit, a predetermined signal is counted, the data in the memory is read out, the count result is added to the read data, and the result is output, and a power-off signal is supplied from the power supply circuit. and a control circuit for writing the addition result into a writable and readable memory when the addition is performed.