JPH04287226A - Clock-operated data processor - Google Patents

Abstract

PURPOSE:To transplant a program between devices irrespective of the clock frequency an oscillator for central processing unit. CONSTITUTION:This data processor is provided with an oscillator 10 which generates clock signals for controlling a central processing unit 11, clock counter which can add or subtract the number of oscillation, and oscillator 12 for clock counter which is exclusively used for the counter 13. This data processor is also provided with a processing time storing area 17 where the processing time information related to the clock signals for controlling the unit 11 and a processing time measuring means 16 which measure the processing time per one clock of the clock signals by using the counter 13 and stores the measured value in the area 17.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention uses a program stored in a volatile semiconductor memory (RAM) or a non-volatile semiconductor memory (ROM) to monitor time using a central processing unit (for example, a software loop). M.P.
The present invention relates to a data processing device that operates using a clock that performs processing that depends on the number of clocks of a CPU (U or CPU).

[0002]Currently, when a program written in a high-level computer language such as C language or FORTRAN language is ported to another device, the software program must be
When having a processing unit that depends on the clock number of the central processing unit, the MPU control clock number of the porting destination device, that is, M
It is necessary to change the processing for each frequency of the PU control crystal oscillator.

0003

[Background Art] When porting a program between data processing devices, it must be taken into consideration that the processing time per clock of the MPU changes depending on the frequency of the MPU control crystal oscillator in the porting destination device. . For example, this is the case when the program to be ported performs time monitoring processing that depends on the number of MPU clocks, such as a software timer.

Conventionally, when porting such a program to a device with a different MPU control crystal oscillator frequency, a human has to calculate the processing time per MPU control clock for each porting device and change the program. Ta.

[0005]

[Problem to be Solved by the Invention] In the prior art, when porting between devices, it is necessary to modify the processing that depends on the number of MPU control clocks of the program, making porting between devices complicated. Moreover, there was a problem in that unexpected results would occur if there was an error in modifying the source program or in calculating the time.

The present invention aims to solve the above problems, and even when a program is ported to a device with a different crystal oscillator frequency, processing parts that depend on the number of MPU control clocks can be automatically performed without modifying the source program etc. The purpose is to improve portability between devices.

[0007]

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, 10 is an oscillator for the central processing unit, which generates a clock signal using a crystal oscillator, etc., 11 is a central processing unit (MPU or CPU) that fetches and executes instructions stored in memory, and 12
13 is a clock counter oscillation device composed of a crystal oscillator or the like; 13 is a clock counter that adds or subtracts the number of oscillations from the clock counter oscillation device 12; and 14
15 is a control program such as an operating system; 16 is a processing time measurement processing unit; 17 is a processing time measurement processing unit 16; Processing time storage area where measured processing time information is stored, 1
8 represents a processing program that performs processing depending on the number of control clocks of the central processing unit 11.

The central processing unit 11 executes instructions in synchronization with a clock signal generated by the central processing unit oscillation device 10. The clock counter oscillator 12 is a device that generates a clock for the clock counter 13.
It has a common frequency for the devices to which the program is to be ported. The clock counter 13 is a counter that can be read and written by a program, and the clock counter oscillator 12
Add or subtract the number of oscillations from.

A control program 15 executed by the central processing unit 11 is stored in the memory 14 . The control program 15 has a processing time measurement processing section 16, and includes, for example, an I.
The processing time measurement processing unit 16 is operated during PL. The processing time measurement processing unit 16 is connected to the central processing unit 1
The processing time per clock of the clock signal controlling the clock signal 1 is measured using the clock counter 13, and the value is stored in the processing time storage area 17.

[0010] When each processing program 18 operates,
Processing time information per clock regarding the operating clock of the central processing unit 11 is stored in the processing time storage area 17. Therefore, when performing processing that depends on the number of MPU control clocks, the processing program 18 obtains processing time information from the processing time storage area 17 and dynamically adjusts the time.
Even devices having central processing unit oscillation devices 10 of different frequencies can be handled using a common processing logic.

[0011]

[Operation] The processing time measurement processing unit 16 sets an arbitrary monitoring time for the clock counter 13 when calculating the processing time per clock. Then, the state of the clock counter 13 is checked and the number of processing steps associated with it is added until the monitoring time ends. When the monitoring time ends, the number of clocks within the monitoring time is calculated from the number of processing steps of the instruction executed from the setting of the monitoring time to the end of the monitoring time, and the processing time per clock is determined. The information is stored in the processing time storage area 17 in the memory 14 or a register held by the MPU.

Even if the oscillation frequency of the central processing unit oscillation device 10 changes, the processing program 18 can calculate the number of steps required for time adjustment from the processing time per clock by referring to the processing time storage area 17. It can be calculated. Therefore, it is possible to perform porting without being aware of changes to processes that depend on the MPU clock processing time, such as software timers.

Note that 1 stored in the processing time storage area 17
The processing time per clock may be any value that can be substantially converted into this value, and the present invention can be implemented using, for example, the number of clocks or the number of executed instructions per unit time.

[0014]

Embodiment FIG. 2 shows a flowchart of a processing time measurement processing section according to an embodiment of the present invention. The following will explain the processes 1 to 2 shown in FIG. ■ When the processing time measurement processing section 16 is activated during IPL, the processing time measurement processing section 16 first starts with 500ms or 1 seconds.
An arbitrary monitoring time such as sec is set in the clock counter 13. In this example, the clock counter 13 is operated by 1μ by the clock from the clock counter oscillator 12.
Subtraction processing is performed every s. The clock counter 13 has a register that notifies the end of the clock when the counter value reaches 0 and the set time has elapsed.

(2) The processing time measurement processing unit 16 checks the passage of the monitoring time set in the clock counter 13. If the monitoring time has not ended, that is, if the value of the clock counter 13 has not become 0, proceed to process 2. If the value of the clock counter 13 has become 0 and the monitoring time has ended, the process continues. Proceed to ■.

(2) If the termination condition is not satisfied, the number of monitoring times or the number of processing steps is added to a register in the central processing unit 11. Here, the number of processing steps is the number of steps at the time of determination by process (2) and the number of steps in addition processing by this process (2). After the addition, repeat the process (■) in the same way.

(2) The required number of clocks within the monitoring time is calculated from the number of monitoring times or the number of processing steps counted in process (2), and the processing time per clock is determined by dividing the monitoring time by the number of clocks. For example, 1 clock
In a computer that executes instructions step by step, the processing (execution) time T per clock is T = monitoring time ÷ (total number of execution steps of processing 1 and 2).

■ The processing time obtained in process ■ is stored in memory 1.
4 is stored in the processing time storage area 17, and the processing ends. By referring to this information, one of the central processing units 11
In the part where repetitive processing is performed with consideration to the processing time per clock, it becomes possible to dynamically calculate how many times the repetitive processing must be performed to elapse the required time.

FIG. 3 shows a flowchart of the time waiting process of the processing program. For example, if timer interrupts cannot be used, or if another program uses clock counter 1.
3, the own program cannot use the clock counter 13, and if it needs to wait for a certain period of time, the central processing unit oscillation device 10 can be Even if the frequencies are different, the required waiting time can be achieved using the same processing logic.

(2) Obtain the processing time per clock from the processing time storage area 17. ■ Divide the waiting time by the processing time per clock and determine the number of loops from the resulting number of clocks. ■~■ Repeat the process of subtracting the loop count by 1 until the loop count becomes 0, and when the loop count becomes 0, end the loop. As a result,
Recognize that the required waiting time has elapsed.

[0021]

[Effect of the invention] As explained above, according to the present invention,
By calculating the processing time per MPU clock and allowing each program to refer to this, it is possible to calculate the number of repetitions from the processing execution time when executing repetitive processing that involves time monitoring, and the central processing It becomes possible to perform porting between devices without being aware of the clock frequency of the device oscillator.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention.

FIG. 2 is a processing flowchart of a processing time measurement processing section according to an embodiment of the present invention.

FIG. 3 is a flowchart of a time waiting process of a processing program according to an embodiment of the present invention.

[Explanation of symbols]

10 Oscillation device for central processing unit 11 Central processing unit 12 Oscillation device for clock counter 13
Clock counter 14 Memory 15 Control program 16 Processing time measurement processing section 17 Processing time storage area 18 Processing program

Claims (1)

[Claims] Claim 1: A data processing device comprising a central processing unit (11) and a memory (14), comprising: a central processing unit (11);
) an oscillation device (10) that generates a clock signal to control the
and a clock counter that can add or subtract the number of oscillations (
13), a clock counter oscillator (12) dedicated to the clock counter (13), and the memory (14).
a processing time storage area (17) in which processing time information regarding a clock signal that controls the central processing unit (11) is stored in a predetermined position in the memory or in a predetermined register that can be referenced by the program; and a memory (14). A control program (15) stored in the central processing unit (11) measures a value corresponding to the processing time per clock of the clock signal that controls the central processing unit (11) using the clock counter (13), and calculates the value. A data processing device operated by a clock, comprising: processing time measuring means (16) for storing the processing time in the processing time storage area (17).