JPH05290334A - Counting device - Google Patents

Abstract

PURPOSE:To improve counting accuracy by allowing a first memory means to store the lower column which has less importance among counting data weighted, and allowing a second memory means of non-volatile to store the upper column which has considerable importance, and updating the first and the second means respectively whenever updating and carrying of the lower column occur. CONSTITUTION:The lower column which has less importance among counting data weighted is stored in the first memory means 4, while the upper column which has considerable importance among counting data weighted is stored in the second memory means 8 consisting of non-volatile memories. Thus, the first means 4 is updated in every update of the lower column of counting data, while the second means 8 is updated in every carrying of the lower column. That is, counting data is counted with high accuracy in the first means 4, and the upper column having considerable importance among counting data is surely held in the second means 8.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIG. 1) Action (FIG. 1) Example (FIGS. 1 to 3) Effect of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counting device, and is preferably applied to, for example, a device for counting and accumulating operation time of a rotary drum in a video tape recorder.

[0003]

2. Description of the Related Art Conventionally, in a video tape recorder used in a business such as a broadcasting station or a video production, a rotating drum which has accumulated a frequency of use of a rotating drum as a use time and has reached a predetermined frequency of use. By replacing the assembly, it is possible to prevent deterioration of image quality during recording and playback due to wear of the rotating drum and magnetic head.
It is designed to ensure high performance and reliability of rotating drums and magnetic heads.

In order to accumulate the usage time of the rotating drum in this way, there is an hour meter which is conventionally adapted to energize when the rotating drum is used by utilizing the vapor pressure of mercury. Instead, an hour meter is used that utilizes the computer's built-in timer.

[0005]

By the way, as an hour meter using the built-in timer of the computer as described above, the timer value of the R is backed up by a lithium battery or the like.
There is an AM (Random access memory) that is adapted to be cumulatively stored.

However, in the hour meter in which the timer value is stored in the RAM as described above, if the lithium battery runs out due to some trouble, the timer value stored in the RAM is not compensated and an abnormal value is displayed. I got it.

In order to solve this problem, an EEP in which the timer value does not need to be backed up by a battery and can be electrically rewritten
ROM (Electrically erasable programmable RO
An hour meter adapted to use M) has been proposed.

However, as described above, the timer value is set to EEPRO.
In the hour meter that cumulatively stores in M, EEPROM
On the other hand, since a predetermined writing time is required, there is a problem that the timer accuracy is deteriorated as compared with the case of storing in the RAM.

In addition to this, the number of writing times of the EEPROM itself is limited to, for example, about 100,000 times, which is not practically sufficient as an hour meter for a commercial video tape recorder. When using the EEPROM, set the timer value to EE at the timing when the power is turned off.
There is a problem that a circuit is complicated because an extra circuit for writing in the PROM is required.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a counter device capable of counting count data with high accuracy and reliably holding the counter data.

[0011]

In order to solve such a problem, in the present invention, the count data is weighted according to the importance, and the lower digit of the lower importance is stored and the lower digit of the count data is stored. A first memory means 4 in which the stored contents are updated at each update, and a non-volatile memory,
The second memory means 8 stores the upper digit of the count data, which has a higher degree of importance, and the lower digit of the count data, which is updated every time a carry occurs in the lower digit. Was set up.

In the second invention, the operation time of the electronic device is counted as the count data. Further, in the third invention, the number of times of operation of the electronic device is counted as the count data.

[0013]

In the first memory means 4, the weighted count data is used to store the lower significant digits, and the second memory means 8, which is a non-volatile memory, stores the weighted count data, and the higher significant digits are weighted. By storing the digit and updating the first memory means 4 each time the lower digit of the count data is updated, and updating the second memory means 4 each time a carry occurs in the lower digit. The first memory means 4 can count the count data with high accuracy, and the second memory means 8 can surely hold the higher significant digit of the count data.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 generally indicates a video tape recorder 1 according to the present invention, and a video tape recorder body (VTR) 2 is controlled by a CPU 3. The CPU 3 sends the command COM to control the VTR 2, and the operating state of the VTR 2 is input as the status STS, and the VTR 2 is controlled based on the operating state. As the status STS, for example, recording,
Data representing states such as playback, fast-forward, rewind, stop and pause are input.

In the case of this embodiment, the CPU 3 has an internal counter for energization and a drum hour meter. Based on the internal counter for energization and a drum hour meter, the energization counter CN1 of the RAM 4 and the drum. The count data is transferred to the counter CN3 through the first output terminal of the selector 5. This RAM4 is a power source P
From the moment W is cut off, the lithium battery 7 backs up through the switching circuit 6.

The internal counter for the current-carrying hour meter constantly counts while the power PW is turned on, and the internal counter for the drum hour meter counts when the drum is operating. Actually CP
U3 determines that the drum is operating during the period in which the data indicating the recording and reproducing state is input as the status STS from the VTR 2.

In the case of this embodiment, the internal counters for the energization and drum hour meters and the energization counter CN1 and the drum counter CN3 in the RAM 4 count from 0 hours 0 minutes 0 seconds to 9 hours 59 minutes 59 seconds. Has been done.

Accordingly, when the internal counter for the energization and the drum hour meter overflows at the timing of 10 hours, 0 minutes, and 0 seconds to cause the carrier CR, the selector 5 outputs the second output by the carrier CR. It is switched to the end b, and the contents of the energization counter CN2 and the drum counter CN4 provided on the EEPROM 8 are updated.

Here, the CPU 3 executes the energization hour meter processing program SP0 and the drum hour meter processing program SP10 shown in FIGS. 2 and 3 to execute the above-mentioned counter processing. That is, when the power source PW of the VTR 2 is turned on, the CPU 3 enters from the energization hour meter processing program SP0, counts up the internal counter for the energization hour meter in the next step SP1, and in response to this, the energization counter CN1 of the RAM 4 Count up.

Subsequently, in step SP2, the CPU 3 carries a carry CR to the internal counter for the current-carrying hour meter.
It is determined whether or not has occurred. If a negative result is obtained because there is no carrier CR in this step SP2, the CPU 3
Returns to the above-mentioned step SP1 and continues counting up of the counter for the current-carrying hour meter and the power-carrying counter CN1 of the RAM4.

When the CPU 3 obtains an affirmative result due to the presence of the carrier CR at step SP2, it executes the next step SP3 to step SP5, and the EEPROM.
The contents of the energization counter CN2 in 8 are read out and counted up by one, the result is written in the energization counter CN2 in the EEPROM 8, and the process returns to the above-mentioned step SP1.

When the power PW of the VTR 2 is turned on at the same time as the energization hour meter processing program SP0 described above, the CPU 3 executes the drum hour meter processing program SP10.
Then, in the next step SP11, the process waits until the drum is turned on.

Finally, the drum is turned on and the step SP
When a positive result is obtained in 11, the CPU 3 proceeds to the next step SP.
In step 12, the internal counter for the drum hour meter is counted up, and the drum counter CN3 of the RAM 4 is counted up accordingly.

Subsequently, in step SP13, the CPU 3 carries the carrier C to the internal counter for the drum hour meter.
It is determined whether R has occurred. If a negative result is obtained because there is no carrier CR in this step SP13, CP
U3 executes the above-mentioned steps SP11 and SP12 to continue the count-up of the internal counter for the drum hour meter and the drum counter CN3 of the RAM 4 when the drum is in the ON operation.

When the CPU 3 obtains an affirmative result due to the presence of the carrier CR at step SP13, it executes the following steps SP14 to SP16 to execute EEP.
The contents of the drum counter CN4 in the ROM 8 are read out and counted up by one, and the result is written in the drum counter CN2 in the EEPROM 8, and the above-mentioned step S is executed.
Return to P11.

In this way, in the case of the video tape recorder 1, the energization and the drum hour meter count data are weighted, and the internal counter of the CPU 3 and the energization counter CN1 and the drum counter CN3 in the RAM 4 are set to 0.
Counts from time 0 minutes 0 seconds to 9 hours 59 minutes 59 seconds,
The energization counter CN2 and the drum counter CN3 in the EEPROM 8 count 10 hours or more.

Further, for example, the display portion of the VTR 2 (not shown)
When displaying the time information of the energization hour meter and the drum hour meter, the data of 10 hours or more is read from the energization counter CN2 and the drum counter CN4 of the EEPROM 8 and the data of less than 10 hours is read in the RAM4. The data is read from the CN1 and the drum counter CN3 and displayed together.

By doing so, the RAM 4 can manage time data of less than 10 hours, and the EEPROM 8 can manage time data of digits of 10 hours or more. In fact, even if the power PW is cut off, the RAM 4 keeps the time data backed up for 10 years or more by the lithium battery. Since the EEPROM 8 is a non-volatile memory, the time data can be surely backed up.

Further, the updating in units of seconds is executed only for the energization counter CN1 and the drum counter CN3 of the RAM 4 which has a high data rewriting speed, whereby sufficient accuracy is ensured as the energization hour meter and the drum hour meter. it can.

When the number of times of rewriting of the EEPROM 8 is 100,000, for example, the time data can be managed up to 1 million hours, that is, for 100 years or more, and a practically sufficient time can be measured. Further, even if the lithium battery is lost due to some trouble, the minimum required time data in 10-hour units is stored in the EEPROM 8, and sufficient reliability can be secured as the energization hour meter and the drum hour meter.

According to the above configuration, the count data of the energizing hour meter and the drum hour meter are weighted,
The digits of the count data up to less than 10 hours are stored in the RAM 4 and the count data of 10 digits is stored in the EEPROM 8.
A digit of time or more is stored, RAM4 is updated every time the digit of the count data is updated up to less than 10 hours, and E is generated every time a carrier CR is generated by updating the digit of less than 10 hours.
By updating the EPROM8, the RAM
The count data can be counted with high accuracy and
It is possible to realize the video tape recorder 1 having the current-carrying hour meter and the drum hour meter that can reliably hold the digit of 10 hours or more, which is the most important of the count data, in the EPROM.

In the above embodiment, the case where the time data consisting of the count data is weighted and divided into digits of 10 hours or more and digits of less than 10 hours and stored is described. Not limited to this, the data may be divided into various digits and stored according to the importance of the data to be counted.

Further, in the above-mentioned embodiments, the case where the present invention is applied to the counting device which constitutes the current-carrying hour meter and the drum hour meter of the video tape recorder has been described, but the present invention is not limited to this, and various electronic devices can be used. It is suitable for wide application to a counter device that cumulatively counts the operation time and the number of times of operation in a device.

[0035]

As described above, according to the present invention, the first memory means stores the lower-order digits of low importance by the weighted count data, and the second memory is the non-volatile memory.
The memory means stores the high-order digit of high importance with the weighted count data, updates the first memory means each time the low-order digit of the count data is updated, and updates the first digit each time a carry occurs in the low-order digit. By updating the second memory means, the first memory means can count the count data with high accuracy, and the second memory means surely holds the high-order digit of the count data. It is possible to realize a counting device to obtain.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video tape recorder in which a counting device according to the present invention is applied to an energization and drum hour meter.

FIG. 2 is a flow chart showing an energization hour meter processing program executed by the CPU.

FIG. 3 is a flow chart showing a drum hour meter processing program executed by the CPU.

[Explanation of symbols]

1 ... Video tape recorder, 2 ... VTR body, 3 ...
... CPU, 4 ... RAM, 5 ... selector, 6 ... switching circuit, 7 ... lithium battery, 8 ... EEPROM.

Claims (3)

[Claims] 1. A first memory in which count data is weighted according to importance, a lower digit having a lower importance is stored, and the stored content is updated each time the lower digit of the count data is updated. And a non-volatile memory, the upper digit of the count data having higher importance is stored, and when the lower digit of the count data is updated, a carry is generated in the lower digit. A second memory means for updating stored contents. 2. The counting device according to claim 1, wherein an operating time of an electronic device is counted as the count data. 3. The counting device according to claim 1, wherein the number of times the electronic device has been operated is counted as the count data.