JPH0643963A - Computer system equipped with timer function - Google Patents

Abstract

PURPOSE:To automatically correct the time at the time of interruption by a timer circuit. CONSTITUTION:An automatic time correction mode is stored and set in a time correction information memory 6. A correction time point deciding means decides whether or not the frequency of interruption from the timer circuit 1 reaches a value corresponding to timer interval information for automatic time correction previously set and stored in the time correction information memory 6. When the decision is made, a time correcting process means calculates a correction time according to the time interval information for automatic correction stored in the time correction information memory 6 and error information on time intervals at which the timer circuit 1 initiates interruption. Further, the time data stored in a time memory 4 is corrected according to the correction time calculated by the time correcting process means to calculate current time data, which are stored in the time memory 4 to update its memory. Therefore, the time data in the timer memory 4 can automatically be corrected when the interruption is initiated at every constant time interval.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system having a timekeeping function for setting a time and performing timer processing at a fixed time interval by an interrupt generated at a fixed time interval. .

[0002]

2. Description of the Related Art A conventional computer system has a timekeeping function with the configuration shown in FIG. That is, an interrupt is generated from the timer circuit (1) at a constant time interval of several msec to several tens of msec, and the interrupt analysis unit (2) determines whether the interrupt from this timer circuit is correct for time setting. When it is determined that the interrupt is the correct interrupt, the interrupt processing unit (3) generates a fixed time or a count that is the time interval at which the interrupt occurs each time the interrupt occurs or each time the predetermined number of interrupts is counted. The predetermined time corresponding to the number of interrupts is added to the time data stored in the time memory (4) to calculate the current time, and the current time is rewritten and stored in the time memory (4) for setting.

[0003]

As described above, in the conventional computer system, the clock function is operated by the clock means for calculating the current time based on the number of interrupts generated from the timer circuit (1) at a constant time interval. I'm supposed to get it. However, since there is a slight error in the time interval of the interrupt generated from the timer circuit (1), a constant time corresponding to this time interval is sequentially added to the current time at that time to calculate the time. As the time goes by, the error between the time set in the time memory (4) and the actual time increases as time elapses from the time setting. Therefore, when this error becomes large, the user has to perform the time update setting, which results in a troublesome operation for the user.

Therefore, it is a technical object of the present invention to provide a computer system having a clock function capable of automatically correcting the time when the timer circuit interrupts.

[0005]

According to the present invention, as a technical means for achieving the above-mentioned object, a computer system having a timekeeping function is configured as follows. That is, in a computer system having a timekeeping function for calculating the current time based on the constant time interval and setting and storing the current time in the time memory each time an interrupt is generated from the timer circuit at the constant time interval, setting information of the time automatic correction mode, A time correction information memory that stores time interval information for automatic time correction, error information of a time interval for generating an interrupt of a timer circuit, and the number of interrupts from the timer circuit when the time automatic correction mode is set. A time point stored in the correction information memory, a correction time point determination means for determining a correction time point based on whether or not a value corresponding to a time interval for performing automatic correction, and the time point when the correction time point determination means determines the correction time point Correction information The time interval information for automatic time correction stored in the memory and the error in the time interval at which the timer circuit interrupts are generated. Is configured as characterized by having a time correcting means which corrects the time data of stored in the time memory by the correction time while calculating a correction time based on the information to update the current time data.

[0006]

When the automatic time correction mode is stored and set in the time correction information memory, the correction time determination means counts the number of interrupts from the timer circuit, and this count value is preset and stored in the time correction information memory. Each time the value corresponding to the time interval for performing the time automatic correction is reached, the time correction processing unit determines, for example, the time interval information for performing the time automatic correction stored in the time correction information memory and the time interval for generating the interrupt of the timer circuit. The correction time is calculated by multiplying the error information and the correction time is subtracted or added to the time data stored in the time memory to calculate the current time data, and the current time data is updated and stored in the time memory.

Therefore, since the time data in the time memory can be automatically corrected and set at the time of interruption from the timer circuit at each correction time point of the preset time interval, the user's complicated time correction operation can be performed. It can be eliminated, and the operability of the user is significantly improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a functional block configuration of an embodiment of the present invention. In FIG. 1, the same or equivalent parts as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. Only different structures will be described. The time correction information setting unit (8) generates various time correction information, that is, mode setting information indicating whether or not to perform automatic time correction, time interval information for performing automatic time correction, and an interrupt of the timer circuit (1). Various kinds of time correction information such as time interval error information are set and input. The time correction information discriminating unit (9) discriminates whether or not the information input from the time correction information setting unit (8) is proper. Information processing unit (1
Output to 0). The time information processing unit (10) stores the input time correction information in the time correction information memory (6) and sets it.

The interrupt discriminating unit (5) has the same function as the interrupt analyzing unit (2) of FIG. 3 for discriminating whether or not the interrupt from the timer circuit (1) is a correct one for time setting. , And has a function of determining whether or not to perform time correction by referring to the information in the time correction information memory (6). The time correction processing unit (7) refers to the information stored in the time correction information memory (6) to determine whether or not to perform time correction, and when it determines to perform time correction, the time correction information memory (7) The correction time for correcting the current time is calculated based on the information in 6), and the correction time resulting from the calculation is subtracted or added to the time data stored in the time memory (4) to calculate the current time data. , The current time data is updated and stored in the time memory (4).

Next, the operation of the above configuration will be described in detail with reference to the flowchart of FIG. When an interrupt is generated from the timer circuit (1), the interrupt discriminating unit (5) discriminates whether or not it is in the time automatic correction mode based on the information set and stored in the time correction information memory (6) (step S1). Now, by the user, the time correction information establishment section (8)
When the setting information of the time automatic correction mode is input from and is set and stored in the time correction information memory (6), the interrupt determination unit (5) sets the correction count built in the time correction information memory (6) to "1". Only count up (step S
2). After that, the time correction processing unit (7) automatically sets the count value of the above-mentioned correction counter to a value corresponding to the time interval for performing the time automatic correction set and stored in the time correction information memory (6). It is determined whether or not it is time to make a correction (step S3). When it is determined that it is not the correction time point, the interrupt determination unit (5) is used as in the case of FIG.
Is output to the interrupt processing unit (3) from the interrupt processing unit (3), and the interrupt processing unit (3) counts the number of interrupts for a certain period of time interval at which an interrupt occurs in the time data stored in the time memory (4) or the interrupt occurrence count. To calculate a current time by adding a constant time corresponding to (step S6)
At the same time, the current time is rewritten and stored in the time memory (4) and set (step S7). The above operation is repeated until it is determined that it is time to automatically correct the time, and the correction counter is incremented by "1" at each repetition.

Then, the count value of the correction counter becomes a value corresponding to the time interval for performing the time automatic correction set in the time correction information memory (6), and it is determined that the time is automatically corrected ( Step S3) and first,
Initialize or clear the correction counter (step S
After 4), the time correction processing unit (7) calculates the correction time based on various information stored in the time correction information memory (6) (step S5). That is, the time correction information memory (6)
The time interval error information for generating the interrupt of the timer circuit (1) stored in the table is multiplied by the time interval information for performing the time automatic correction, and the correction time from the previous time correction time to the current time correction time is calculated. calculate. Further, the time correction processing unit (7) subtracts or adds the calculated correction time to the time data of the time memory (4) to calculate the current time (step S6), and stores the current time in the time memory (4). It is rewritten, stored and set (step S7).

On the other hand, the interrupt discriminating section (5) and the time correction processing section (7) determine that the time automatic correction mode is not set in the time correction information memory (6) (step S1).
If the timer circuit (1) is used, as in the case of FIG.
The interrupt determination unit (2) determines whether or not the interrupt from is the correct one for time setting, and when it is determined that the interrupt is the correct interrupt, the interrupt processing unit (3) performs the interrupt for each interrupt or a predetermined value. Each time the number of interrupts is counted, the current time is calculated by adding the fixed time of the interrupt time interval or the fixed time corresponding to the counted number of interrupts to the time data stored in the time memory (4) (step S6). ), The current time is rewritten and stored in the time memory (4) and set (step S7).

[0013]

As described above, according to the computer system having the timekeeping function of the present invention, the correction time discriminating means interrupts the timer circuit by storing and setting the time automatic correction mode in the time correction information memory. Each time it determines that the number of times has reached the value corresponding to the time interval for performing the time automatic correction preset and stored in the time correction information memory, the time correction processing means performs the time automatic correction stored in the time correction information memory. A correction time is calculated based on the time interval information to be performed and error information of the time interval at which an interrupt of the timer circuit is generated, and the current time data is calculated by correcting the time data stored in the time memory based on this correction time. Because I did
Since the time data in the time memory can be automatically corrected and set at the time of interruption from the timer circuit at each correction time point of the preset time interval, the user's complicated time correction operation can be eliminated. The operability of the user is significantly improved.

[Brief description of drawings]

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

FIG. 2 is a flowchart of the same.

FIG. 3 is a functional block configuration diagram showing a time counting function of a conventional computer system.

[Explanation of symbols]

 1 Timer Circuit 4 Time Memory 5 Interrupt Discrimination Unit (Correction Time Discrimination Means) 6 Time Correction Information Memory 7 Time Correction Processing Unit (Time Correction Processing Means)

Claims (1)

[Claims] 1. A computer system having a timekeeping function for calculating a current time based on the constant time interval and setting and storing the time in a time memory each time an interrupt is generated from the timer circuit at the constant time interval. Setting information,
A time correction information memory that stores time interval information for automatic time correction, error information of a time interval for generating an interrupt of a timer circuit, and the number of interrupts from the timer circuit when the time automatic correction mode is set. A time point stored in the correction information memory, a correction time point determination means for determining a correction time point based on whether or not a value corresponding to a time interval for performing automatic correction, and the time point when the correction time point determination means determines the correction time point The correction time is calculated based on the time interval information for automatically correcting the time stored in the correction information memory and the error information of the time interval at which the timer circuit interrupts, and the time data stored in the time memory is corrected by this correction time. And a time correction processing means for updating the current time data. Beam.