CN102129392B - Method and associated electronic device for performing adaptive frequency adjustment - Google Patents

Abstract

The invention discloses a method for adaptive frequency adjustment, which is used for controlling the operating frequency of a central processing unit of an electronic device and comprises the following steps: obtaining at least one interrupt service request time and calculating to generate a corresponding calculation result; and dynamically determining a target frequency of the operating frequency of the CPU according to at least the comparison result of the calculation result and a predetermined range, so as to set the operating frequency according to the target frequency when the CPU processes in response to the occurrence of the next interrupt, thereby performing adaptive frequency adjustment. The invention also discloses a related electronic device. The invention can provide the best processing efficiency respectively meeting different requirements of various files under the condition of not excessive power consumption, thereby achieving the best overall efficiency.

Description

Method and associated electronic device for performing adaptive frequency adjustment

technical field

The present invention relates to Interrupt Service Request (Interrupt Service Request, ISR) control, in particular to a method for performing adaptive (Adaptive) frequency adjustment and related electronic devices.

Background technique

In order to achieve the purpose of saving power, the portable electronic devices implemented according to the related art usually have a deliberately lowered operating frequency. However, once an interrupt occurs, the portable electronic device must perform necessary determination and processing procedures, and the above-mentioned deliberately reduced operating frequency will cause delays in the portable electronic device's processing of immediate events. As a result, the overall system load of the portable electronic device for interrupt processing increases significantly as the operating frequency decreases.

In order to solve the above problems, the related art provides a solution for maintaining high-speed operation in order to reduce the overall system load of the portable electronic device for interrupt processing, but this solution will relatively generate power consumption. Related technologies also provide a solution to reduce the number of interrupts, for example: for audio processing, the depth of the First In First Out (FIFO) buffer before the Digital-to-Analog Converter (Digital-to-Analog Converter, DAC) can be increased , that is to increase the buffer space of the first-in first-out buffer in order to reduce the number of interrupts. Please note that this solution will relatively cause the problem of increased hardware cost. In addition, not all types of interrupts can reduce the number of occurrences; timer interrupt (Timer Interrupt) is a typical example that the number of interrupts cannot be reduced in practice.

It can be seen from the above that the relevant technologies face many problems but have no proper and comprehensive solutions. Related technologies really need to be improved.

Contents of the invention

Therefore, one object of the present invention is to provide a method for adaptive frequency adjustment and related electronic devices to solve the above problems.

A preferred embodiment of the present invention provides a method for adaptive frequency adjustment, the method is used to control the operating frequency of a central processing unit (Central Processing Unit, CPU) of an electronic device, the method includes: obtaining At least one interrupt service request (Interrupt Service Request, ISR) time, and calculate the ratio of the interrupt service request time to an expected interrupt occurrence time; dynamically determine a target frequency of the operating frequency of the central processing unit to process in the central processing unit When processing the next interrupt, the unit sets the operating frequency according to the target frequency to perform adaptive frequency adjustment.

While providing the above method, the present invention also provides an electronic device correspondingly, the electronic device includes: a central processing unit, an interrupt service request monitoring unit, and a dynamic adjustment unit. The central processing unit is used to control the operation of the electronic device. In addition, the interrupt service request monitoring unit is used to obtain at least one interrupt service request time and calculate a ratio of the interrupt service request time to an expected interrupt occurrence time. In addition, the dynamic adjustment unit is used to dynamically determine a target frequency of the operating frequency of the central processing unit; wherein when the central processing unit performs processing in response to the occurrence of the next interrupt, the dynamic adjustment unit sets the target frequency according to the target frequency operating frequency for adaptive frequency adjustment.

One of the advantages of the present invention is that, for the application of multimedia devices, using the method of the present invention to dynamically adjust the operating frequency of the central processing unit can be maintained at a relatively low frequency without causing power consumption problems. In addition, once an interrupt occurs, the method of the present invention can dynamically set the operating frequency according to the target frequency, so that the system will not be burdened by low-speed interrupt processing. Therefore, the method of the present invention and the related electronic device can achieve the best overall performance.

Another benefit of the present invention is that the dynamic adjustment unit can dynamically determine the target frequency of the operating frequency according to at least one calculation result; especially, when the predetermined range has a high standard value and a low standard value, the The dynamic adjustment unit can selectively adjust the target frequency according to whether the cumulative number of comparison results of calculation results smaller than the low standard value/greater than the high standard value reaches a predetermined number of times, so the present invention can properly determine the target frequency. Therefore, the electronic device may have various sound files with different sampling frequencies or audio-visual files with different display rates (Frame Rate). Optimum processing performance.

Description of drawings

The drawings described here are used to provide further understanding of the present invention, constitute a part of the application, and do not limit the present invention. In the attached picture:

1 is a schematic diagram of a clock system of an electronic device according to a first embodiment of the present invention;

FIG. 2A is a flowchart of a method for adaptive (Adaptive) frequency adjustment according to an embodiment of the present invention;

FIG. 2B is a flow chart of a variation example of the method shown in FIG. 2A;

3 and 4 are implementation details of the method shown in FIG. 2A in an embodiment;

FIG. 5 is the implementation details of the method shown in FIG. 2A in another embodiment, where this embodiment is a modification example of the embodiment shown in FIG. 4 .

Figure number:

100 electronic device 108 Interrupt path 110 Central processing unit 120 Interrupt service request monitoring unit 130 Dynamic adjustment unit 140 clock controller 140K clock generator 910, 910-1 The method used to perform adaptive frequency adjustment 912, 914, 916-1, 916-2, 918, 920, 922, 924, 925, 930, 932, 934, 936, 942, 944, 946, 950 steps

CPU_CLK Central processing unit clock

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a clock system of an electronic device 100 according to a first embodiment of the present invention. For example, the electronic device 100 may represent a portable multimedia player such as an MP3 player or a video player. Another example: the electronic device 100 may represent a portable electronic device such as a mobile phone or a personal digital assistant (Personal Digital Assistant, PDA). However, this is for the purpose of illustration only and not limitation of the present invention. According to some variations of this embodiment, the electronic device 100 may represent a personal computer (Personal Computer, PC), such as a desktop computer (Desktop Computer) or a laptop computer (Laptop Computer). According to some variations of this embodiment, the electronic device 100 may represent a personal computer with a touch screen.

As shown in FIG. 1 , the electronic device 100 includes: a central processing unit (Central Processing Unit, CPU) 110, an interrupt service request (Interrupt Service Request, ISR) monitoring unit 120, a dynamic adjustment unit 130, and a clock controller 140, wherein the clock controller 140 of this embodiment includes a clock generator 140K. However, this is for the purpose of illustration only and not limitation of the present invention. According to a variation of this embodiment, the clock generator 140K can be disposed outside the clock controller 140 . According to another variation of this embodiment, at least some components in the electronic device 100 (for example: the central processing unit 110, the interrupt service request monitoring unit 120, the dynamic adjustment unit 130 and/or the clock controller 140) can be integrated into a same a component. In addition, the electronic device 100 further includes an interrupt path 108 , wherein some components in the electronic device 100 such as the central processing unit 110 and the interrupt service request monitoring unit 120 can receive interrupts through the interrupt path 108 .

According to this embodiment, the central processing unit 110 is used to control the operation of the electronic device 100 . In addition, the ISR monitoring unit 120 is used to obtain and calculate at least one ISR time t _ISR to generate a corresponding calculation result. For example: the interrupt service request monitoring unit 120 calculates the proportion of the interrupt service request time to an expected interrupt occurrence time to generate the calculation result. In addition, the dynamic adjustment unit 130 is used to dynamically determine a target frequency f _TARGET of the operating frequency f _{CPU_CLK} of the central processing unit 110 according to at least a comparison result between the calculation result and a predetermined range. In particular, when the central processing unit 110 performs processing in response to the occurrence of the next interrupt, the dynamic adjustment unit 130 can set the operating frequency f _{CPU_CLK} according to the target frequency f _TARGET to perform adaptive frequency adjustment.

The central processing unit clock CPU_CLK in this embodiment is generated by the clock generator 140K and input to the central processing unit 110 for its operation. In practice, according to the adaptive frequency adjustment performed by the dynamic adjustment unit 130, the clock controller 140 can control the frequency of the central processing unit clock CPU_CLK; thus, the dynamic adjustment unit 130 can control the central processing unit through the clock controller 140 The operating frequency f _{CPU_CLK} of 110. For details, please refer to FIG. 2A for further description.

Please refer to FIG. 2A . FIG. 2A is a flowchart of a method 910 for performing adaptive (Adaptive) frequency adjustment according to an embodiment of the present invention, wherein the method 910 is applicable to the electronic device 100 shown in FIG. 1 . The method is described below.

Step 912: When the interrupt service request monitoring unit 120 detects that an interrupt occurs, go to step 914; otherwise, go to step 950.

Step 914: The ISR monitoring unit 120 stores the current time (for example: time point t ₁ ), and stores the above-mentioned current value of the operating frequency f _{CPU_CLK} as a normal frequency f _NORMAL . In practice, the interrupt service request monitoring unit 120 can store the time point t ₁ and the normal frequency f _NORMAL in a memory (not shown) in the electronic device 100 . For example: the storage may be a register provided in the interrupt service request monitoring unit 120 . For another example: the storage may be a register or a memory disposed outside the interrupt service request monitoring unit 120 .

Step 916-1: The dynamic adjustment unit 130 sets the operating frequency f _{CPU_CLK} according to a target frequency such as the above-mentioned target frequency f _TARGET . According to this embodiment, the typical value of the target frequency f _TARGET is greater than or equal to the typical value of the normal frequency f _NORMAL .

Step 918: The interrupt service request monitoring unit 120 checks whether the processing in response to the occurrence of the interrupt is completed. When it is detected that the processing in response to the interruption has ended, go to step 920; otherwise, go back to step 918 and wait for the processing to end. However, this is for the purpose of illustration only and not limitation of the present invention. According to a variation of this embodiment, the interrupt service request monitoring unit 120 does not have to check whether the processing is finished, but the central processing unit 110 actively notifies the interrupt service request monitoring unit 120 to enter step 920 when the processing is finished.

Step 920: The ISR monitoring unit 120 obtains the ISR time t _ISR and calculates it to generate a corresponding calculation result. In particular, the ISR monitoring unit 120 first obtains the current time such as the time point t ₂ , and then calculates the time difference (t ₂ −t ₁ ) as the above-mentioned ISR time t _ISR . However, this is for the purpose of illustration only and not limitation of the present invention. According to a variation of this embodiment, the storage operation performed by the interrupt service request monitoring unit 120 for the time point t ₁ can be changed to be performed after step 916-1; thus, the above-mentioned time difference (t ₂ -t ₁ ) will be more precise.

Step 930: The dynamic adjustment unit 130 dynamically determines the target frequency f _TARGET of the operating frequency f _{CPU_CLK} according to the above calculation result. In practice, the dynamic adjustment unit 130 can store the determined target frequency f _TARGET in a memory (not shown) in the electronic device 100 . For example: the storage may be a temporary register disposed in the dynamic adjustment unit 130 . Another example: the storage may be a temporary register or a memory disposed outside the dynamic adjustment unit 130 .

Step 916-2: The dynamic adjustment unit 130 sets the operating frequency f _{CPU_CLK} according to the normal frequency f _NORMAL . Since this embodiment has stored the value of the operating frequency f _{CPU_CLK} at that time as the normal frequency f _NORMAL when step 914 is executed, the normal frequency f _NORMAL can be regarded as the value of the operating frequency f _{CPU_CLK} before processing in response to the occurrence of an interrupt. . Please note that the operating frequency f _{CPU_CLK} of this embodiment can be dynamically adjusted whenever an interrupt needs to be processed. In particular, whenever an interrupt is processed, the architecture of this embodiment temporarily sets the operating frequency f _{CPU_CLK} to the dynamically adjustable target frequency f _TARGET (that is, the temporary setting of the operating frequency f _{CPU_CLK} when interrupt processing is performed). target value), so after the processing in response to the interrupt is completed, the operating frequency f _{CPU_CLK} can be adjusted back to the value before the processing in response to the interrupt, that is, the normal frequency f _NORMAL .

Step 950: The central processing unit 110 performs normal processing.

According to this embodiment, the loop formed by steps 912, 914, 916-1, 918, 920, 930, and 916-2 is executed every time an interruption occurs, and any time the loop is executed, the dynamic adjustment unit 130 can be based on The current calculation result is used to dynamically determine the next target frequency f _TARGET . In this embodiment, the predetermined range has a high standard value UB and a low standard value LB; especially, the predetermined range can be expressed as an interval [LB, UB]. Every time the loop is executed, the current calculation result can be generated in step 920 , and the comparison result between the current calculation result and the predetermined range can be generated in step 930 . In addition, the current comparison result can be included in the statistics in step 930, especially the number of times is accumulated.

In practice, in step 930 , the accumulated times of a certain type of comparison results can be counted, and the accumulated times of another type of comparison results can also be counted. Therefore, in step 930 , the dynamic adjustment unit 130 can selectively decide to increase or decrease the target frequency f _TARGET according to these accumulated times, or keep the value of the target frequency f _TARGET unchanged. For example, the dynamic adjustment unit 130 can selectively adjust the target frequency f _TARGET according to whether the cumulative number of comparison results of "the calculation result is less than the low standard value LB" reaches a predetermined number N _LB . For another example, the dynamic adjustment unit 130 can selectively adjust the target frequency f _TARGET according to whether the cumulative number of comparison results of "the calculation result is greater than the high standard value UB" reaches a predetermined number N _UB .

Please note that at the beginning when the central processing unit 110 processes the interrupt (for example, when step 914 is executed), the interrupt service request monitoring unit 120 stores the current value of the operating frequency f _{CPU_CLK} as the normal frequency f _NORMAL for subsequent use use. Therefore, after the CPU 110 processes the interrupt (for example, when executing step 916-2), the dynamic adjustment unit 130 can set the operating frequency f _{CPU_CLK} according to the pre-stored normal frequency f _NORMAL . Additionally, step 916 - 2 is performed after step 930 . This is for illustrative purposes only, not limitation of the invention. According to some variations of this embodiment, step 916 - 2 may be performed after step 918 or step 920 . According to other variations of this embodiment, the operation of step 916 - 2 may be incorporated into any step after step 918 such as step 920 or step 930 .

FIG. 2B is a flowchart of a variation of the method 910 shown in FIG. 2A . The above-mentioned method 910 is marked as 910-1 in this variation example, and a new step 925 is added. The differences between this variation example and the embodiment shown in Figure 2A are as follows:

Step 920: The ISR monitoring unit 120 obtains the ISR time t _ISR and calculates it to generate a corresponding calculation result. In particular, the ISR monitoring unit 120 first obtains the current time such as time point t ₂ , and then calculates the time difference (t ₂ −t ₁ ) as the above-mentioned ISR time t _ISR . However, this is for the purpose of illustration only and not limitation of the present invention. According to a variation of this embodiment, the storage operation performed by the interrupt service request monitoring unit 120 for the time point t ₁ can be changed to be performed after step 916-1; thus, the above-mentioned time difference (t ₂ -t ₁ ) will be more precise.

Step 925: The ISR monitoring unit 120 checks whether a condition for entering a frequency adjustment procedure is met. Here, the frequency adjustment process represents the workflow from step 930 to step 916-2; the frequency adjustment process is used to dynamically adjust the target frequency f _TARGET and/or temporarily set the operating frequency f _{CPU_CLK} to be dynamically adjustable The target frequency f _TARGET for this adaptive frequency adjustment. When it is detected that the condition for entering the frequency adjustment procedure is met, go to step 930 ; otherwise, go to step 950 .

Since step 925 is newly added in this variation example, the conditions for entering the frequency adjustment process can be used to control the operation mode and performance of the electronic device 100 in clock control. For example: the conditions for entering the frequency adjustment process can be preset and not changed. Another example: the conditions for entering the frequency adjustment process can be dynamically adjusted.

For example, the condition for entering the frequency adjustment process can be set as: when N consecutive interruptions occur, the estimated target frequency f _TARGET should be increased, or when N consecutive interruptions occur, the estimated target frequency f _TARGET should be adjusted When it drops, it should enter the frequency adjustment process. For example: under the situation of N=3, just enter step 950 once encountering step 925 as soon as two interruptions take place at first; The target frequency f _TARGET should be raised every time; when the third interruption occurs, the target frequency f _TARGET should be lowered. Since the "target frequency f _TARGET should be raised" cannot be continuously accumulated for three times, the "target frequency f _TARGET should be raised" and reset to zero; when the fifth interruption occurs, the target frequency f _TARGET should be lowered when three consecutive interruptions (here, the third, fourth, and fifth times) occur , since the "target frequency f _TARGET should be lowered" has accumulated three times in a row, it is judged that the frequency adjustment process should be entered.

FIG. 3 and FIG. 4 are implementation details of the method 910 shown in FIG. 2A in an embodiment, especially implementation details of step 920 and step 930 . These implementation details are described below.

Step 920 may include the following steps:

Step 922: The ISR monitoring unit 120 calculates the above-mentioned time difference (t ₂ −t ₁ ) to obtain the ISR time t _ISR .

Step 924: The ISR monitoring unit 120 calculates the ratio F _ISR2EXP of the above-mentioned ISR time tISR to an expected interrupt occurrence time t _EXP as the calculation result in step 920 . In practice, the expected interrupt occurrence time t _EXP can be a predetermined parameter, which can make the calculation results easy to compare or suitable for evaluation. In particular, the expected interrupt occurrence time t _EXP can be set as a constant.

Step 930 may include the following steps:

Step 932: The dynamic adjustment unit 130 checks whether the calculation result (in this embodiment, the ratio F _ISR2EXP ) is greater than the upper threshold UB. When the calculation result is greater than the high standard value UB, go to step 934; otherwise, go to step 942.

Step 934: The dynamic adjustment unit 130 checks whether the cumulative number of comparison results of "the calculation result is greater than the high standard value UB" reaches a predetermined number N _UB . When the cumulative number reaches the predetermined number N _UB , go to step 936; otherwise, go to step 916-2.

Step 936 : The dynamic adjustment unit 130 selectively increases the target frequency f _TARGET by a predetermined value, unless the target frequency f _TARGET has reached the highest predetermined value. For example: the predetermined values _of different levels in this embodiment include predetermined values f _{T, 1} , f _{T, 2} , _{. .} . f _T,1 <f _T,2 <...<f _T,X , and the predetermined value of the highest level is f _T,X . In practice, once step 934 enters step 936 , the dynamic adjustment unit 130 may clear the accumulative times described in step 934 to zero. After step 936 is executed, go to step 916-2.

Step 942: The dynamic adjustment unit 130 checks whether the calculation result (in this embodiment, the ratio F _ISR2EXP ) is smaller than the low mark value LB. When the calculation result is less than the low standard value LB, go to step 944; otherwise, go to step 916-2.

Step 944: The dynamic adjustment unit 130 checks whether the cumulative number of comparison results of "the calculation result is less than the low standard value LB" reaches a predetermined number N _LB . When the cumulative number reaches the predetermined number N _LB , go to step 946; otherwise, go to step 916-2.

Step 946 : The dynamic adjustment unit 130 selectively lowers the target frequency f _TARGET by one level of predetermined value, unless the target frequency f _TARGET has reached the lowest level of predetermined value. For example: the predetermined values _of different levels in this embodiment include predetermined values f _{T, 1} , f _{T, 2} , _{. .} . f _T,1 <f _T,2 <...<f _T,X , and the predetermined value of the lowest level is f _T,1 . In practice, once step 944 enters step 946 , the dynamic adjustment unit 130 may clear the accumulative times described in step 944 to zero. After step 946 is executed, go to step 916-2.

According to this embodiment, the low standard value LB is not equal to the high standard value UB; especially, the low standard value LB is smaller than the high standard value UB. This is for illustrative purposes only, not limitation of the invention. According to a variation of this embodiment, the low mark value LB may be equal to the high mark value UB. In addition, in this embodiment, the predetermined number of times N _LB may be equal to the predetermined number of times N _UB . This is for illustrative purposes only, not limitation of the invention. According to a variation of this embodiment, the predetermined number N _LB may not be equal to the predetermined number N _UB .

Please note that the dynamic adjustment unit 130 of this embodiment first compares the calculation result with the high standard value UB at step 932 , and then compares the calculation result with the low standard value LB once entering step 942 . This is for illustrative purposes only, not limitation of the invention. According to some variations of this embodiment, such as the embodiment shown in FIG. 5 , the dynamic adjustment unit 130 can first compare the calculation result with the low standard value LB in step 942, and then perform the calculation result and the high standard value LB once entering step 932. A comparison of the value UB. The similarities between this embodiment and the foregoing embodiments/variations are not repeated here.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. A method for adaptive frequency adjustment, wherein the method is used to control the operating frequency of a central processing unit of an electronic device, and the method includes: Obtaining at least one interrupt service request time, and calculating a ratio of the interrupt service request time to an expected interrupt occurrence time; Dynamically determine a target frequency of the operating frequency of the central processing unit, so that when the central processing unit performs processing in response to the occurrence of the next interrupt, the operating frequency is set according to the target frequency to perform adaptive frequency Adjustment; Wherein, the step of calculating the ratio of the interrupt service request time to an expected interrupt occurrence time further includes: calculating the ratio of the interrupt service request time to an expected interrupt occurrence time to generate a corresponding calculation result; Wherein, the step of dynamically determining a target frequency of the operating frequency of the central processing unit further includes: comparing the calculation result with a predetermined range to generate a comparison result. 2. The method of claim 1, wherein the predetermined range has a high mark and a low mark. 3. The method according to claim 2, wherein the step of dynamically determining a target frequency of the operating frequency of the central processing unit further comprises: When the calculation result is greater than the high standard value and the cumulative number of comparison results with the calculation result greater than the high standard value reaches a predetermined number of times, selectively raising the target frequency by a predetermined level value, unless said target frequency has reached the predetermined value for the highest level; and When the calculation result is greater than the high standard value, but the cumulative number of comparison results with the calculation result greater than the high standard value has not reached the predetermined number, the target frequency is not changed. 4. The method according to claim 2, wherein the step of dynamically determining a target frequency of the operating frequency of the central processing unit further comprises: When the calculation result is less than the low mark value and the cumulative number of comparison results with the calculation result less than the low mark value reaches a predetermined number of times, selectively lowering the target frequency by a predetermined level value, unless said target frequency has reached a predetermined value for the lowest level; and When the calculation result is less than the low mark value, but the cumulative number of comparison results whose calculation result is less than the low mark value has not reached the predetermined number, the target frequency is not changed. 5. The method according to claim 2, wherein the step of dynamically determining a target frequency of the operating frequency of the central processing unit further comprises: accumulating the comparison results, and clearing the previous accumulated records when the comparison results this time are different from the previous comparison results, and When the same comparison result is continuously accumulated for a predetermined number of times, the target frequency is selectively adjusted to a predetermined value of an adjacent level, unless the target frequency has reached a predetermined value of a limit level. 6. method as claimed in claim 1, is characterized in that, described method further comprises: storing the current value of the operation frequency as a normal frequency at the beginning of the processing by the central processing unit in response to the occurrence of the interruption; and After the central processing unit performs processing in response to the occurrence of the interrupt, the operating frequency is set according to the normal frequency. 7. An electronic device, characterized in that the electronic device comprises: a central processing unit for controlling the operation of the electronic device; an interrupt service request monitoring unit, used to obtain at least one interrupt service request time and calculate the ratio of said interrupt service request time to an expected interrupt occurrence time; and a dynamic adjustment unit for dynamically determining a target frequency of the operating frequency of the central processing unit; Wherein when the central processing unit performs processing in response to the occurrence of the next interrupt, the dynamic adjustment unit sets the operating frequency according to the target frequency to perform adaptive frequency adjustment; Wherein, the interrupt service request monitoring unit calculates the ratio of the interrupt service request time to an expected interrupt occurrence time to generate a corresponding calculation result, and the dynamic adjustment unit compares the calculation result with a predetermined Ranges are compared to generate a comparison result. 8. The electronic device according to claim 7, wherein the predetermined range has a high value and a low value; when the calculation result is greater than the high value and the calculation result is greater than the When the cumulative number of times of the comparison result of the high standard value reaches a predetermined number of times, the dynamic adjustment unit selectively raises the target frequency by a predetermined value, unless the target frequency has reached the highest predetermined value. ; and when the calculation result is greater than the high standard value and the cumulative number of comparison results with the calculation result greater than the high standard value has not reached the predetermined number of times, the dynamic adjustment unit does not change the target frequency. 9. The electronic device according to claim 7, wherein the predetermined range has a high value and a low value; when the calculation result is less than the low value and the calculation result is less than the When the cumulative number of times of the comparison result of the low scale value reaches a predetermined number, the dynamic adjustment unit selectively lowers the target frequency by a predetermined value of one level, unless the target frequency has reached the minimum level of the predetermined value ; and when the calculation result is less than the low mark value and the cumulative number of times of the comparison result of which the calculation result is less than the low mark value has not reached the predetermined number of times, the dynamic adjustment unit does not change the target frequency. 10. The electronic device according to claim 7, wherein at the beginning when the central processing unit performs processing in response to the occurrence of the interrupt, the interrupt service request monitoring unit stores the current value of the operating frequency as a normal frequency; and after the central processing unit performs processing in response to the occurrence of the interrupt, the dynamic adjustment unit sets the operating frequency according to the normal frequency.

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