CN103346735A - Clock signal generation method and device of microcontroller and microcontroller - Google Patents
Clock signal generation method and device of microcontroller and microcontroller Download PDFInfo
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- CN103346735A CN103346735A CN201310233438XA CN201310233438A CN103346735A CN 103346735 A CN103346735 A CN 103346735A CN 201310233438X A CN201310233438X A CN 201310233438XA CN 201310233438 A CN201310233438 A CN 201310233438A CN 103346735 A CN103346735 A CN 103346735A
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Abstract
The invention belongs to the field of controllers, and particularly relates to a clock signal generation method and device of a microcontroller and the microcontroller. The method includes the steps that the microcontroller receives clock signals output by an RC oscillating circuit; at the same time, the microcontroller receives an environment temperature value detected by a temperature detection circuit and corrects clock frequency of the clock signals according to the environment temperature value; at the same time, the microcontroller receives a voltage value detected by a voltage detection circuit and corrects the clock frequency of the clock signals according to the voltage value. Therefore, according to the clock signal generation method and device of the microcontroller and the microcontroller, the clock frequency of the clock signals output by an RC oscillator is corrected in real time according to changes of the environment temperature and changes of the working voltage of the RC oscillator to meet clock frequency needed by the microcontroller, and therefore the purpose that the microcontroller works normally with the same frequency can be effectively guaranteed.
Description
Technical field
The invention belongs to the controller field, relate in particular to a kind of clock signal generation method, device and microcontroller of microcontroller.
Background technology
In order to enlarge the computer application occasion, cut out microcontroller, this microcontroller is integrated CPU, RAM, ROM, timer conter and multiple I/O interface; Thereby microcontroller is favored in fields such as the detection of the scene of video conference, adverse circumstances and data relays.
In order to guarantee the microcontroller operate as normal, especially guarantee effective processing and the communications of data, need to keep in real time same clock frequency.The RC oscillator is a kind of clock generator commonly used, and still, the operating voltage of the variations in temperature in the operational environment, RC oscillator changes can cause that all clock frequency changes, and the clock signal that the RC oscillator produces is drifted about.
Summary of the invention
The object of the present invention is to provide a kind of clock signal generation method of microcontroller, the operating voltage that is intended to solve variation of ambient temperature, RC oscillator changes the problem that the clock frequency that causes the output of RC oscillator changes.
The present invention is achieved in that a kind of clock signal generation method of microcontroller, and the clock signal generation method of described microcontroller comprises:
Receive the clock signal of RC oscillating circuit output;
Receive the detected ambient temperature of temperature sensing circuit;
According to described ambient temperature, proofread and correct the clock frequency of described clock signal;
Receive the detected voltage of voltage detecting circuit;
According to described voltage, proofread and correct the clock frequency of described clock signal.
Another object of the present invention is to provide a kind of clock signal generating device of microcontroller, the clock signal generating device of described microcontroller comprises:
Correction module, be used for receiving the clock signal of RC oscillating circuit output, receive the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter;
Described correction parameter module is used for the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
Another object of the present invention is to provide a kind of microcontroller, described microcontroller comprises temperature sensing circuit, voltage detecting circuit and RC oscillating circuit, and described microcontroller also comprises:
Signal receiving end, temperature detection end and voltage detecting end connect the output of described RC oscillating circuit respectively, the output of described temperature sensing circuit and the output of described voltage detecting circuit, be used for receiving the clock signal of RC oscillating circuit output, receive the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the correction module of the clock frequency of described clock signal according to described second frequency correction parameter;
Be connected with described correction module, be used for the described correction parameter module of the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
In the present invention, microcontroller receives the clock signal of RC oscillating circuit output; Meanwhile, receive the detected ambient temperature of temperature sensing circuit, according to described ambient temperature, proofread and correct the clock frequency of described clock signal; Meanwhile, receive the detected voltage of voltage detecting circuit, according to described voltage, proofread and correct the clock frequency of described clock signal; Thereby, the embodiment of the invention changes according to the operating voltage of variation of ambient temperature, RC oscillator, the clock frequency of the clock signal of correction RC oscillator output in real time guarantees effectively that to satisfy the required clock frequency of microcontroller microcontroller is with same frequency operate as normal.
Description of drawings
Fig. 1 is the flow chart of the clock signal generation method of the microcontroller that provides of the embodiment of the invention;
Fig. 2 is the composition structure chart of the clock signal generating device of the microcontroller that provides of the embodiment of the invention;
Fig. 3 is the circuit diagram of the microcontroller that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Fig. 1 shows the flow process of the clock signal generation method of the microcontroller that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
During the variation of ambient temperature of the operational environment that is in when the RC oscillating circuit, cause that the clock frequency of the clock signal of RC oscillating circuit output changes.Pre-determined the clock frequency of required clock signal when microcontroller after, the RC oscillating circuit is arranged to export the clock signal with this clock frequency.
Need to prove, at microcontroller (Micro Control Unit, MCU) chip dispatches from the factory when when test or chip programming program test, detect the clock frequency of the clock signal of RC oscillating circuit output, when the clock frequency of the clock signal of RC oscillating circuit output satisfies the clock frequency of the required clock signal of microcontroller, record working temperature at that time is with as optimum working temperature, and record operating voltage at that time is with as optimum operating voltage.Perhaps, after the clock signal of RC oscillating circuit output carried out frequency division, the clock frequency of the clock signal behind the detection frequency division, in like manner, when the clock frequency after the required clock signal of this clock frequency and microcontroller is carried out identical frequency division is equal or the most close, record working temperature at that time is with as optimum working temperature, and record operating voltage at that time is with as optimum operating voltage.More optimizedly, optimum working temperature, optimum operating voltage and corresponding clock frequency are write in the not erasable storage medium such as OTP ROM, FLASH, EERPOM.
Need to prove, when MCU dispatches from the factory, the clock frequency of testing the clock signal of the RC oscillating circuit output among the MCU in advance concerns with variation of temperature, the temperature frequency mapping relations table of the clock frequency of the clock signal of storage temperature and the output of RC oscillating circuit is preserved the temperature variant temperature frequency line of this clock frequency; In like manner, test the clock frequency of clock signal of the RC oscillating circuit output among the MCU in advance with the variation relation of the voltage that provides to the RC oscillating circuit, the electric voltage frequency mapping relations table of the clock frequency of the clock signal of preservation voltage and the output of RC oscillating circuit is preserved this clock frequency with the electric voltage frequency line of described change in voltage.More optimizedly, described temperature frequency mapping relations table, described electric voltage frequency mapping relations table, described temperature frequency line and described electric voltage frequency line are write in the not erasable storage medium such as OTP ROM, FLASH, EERPOM.
After having set up temperature frequency mapping relations table, electric voltage frequency mapping relations table, temperature frequency line and electric voltage frequency line, after the RC oscillating circuit works on power, present embodiment provides a kind of clock signal generation method of microcontroller, and the clock signal generation method of described microcontroller comprises:
Step S101 receives the clock signal that the RC oscillating circuit is exported.
After microcontroller worked on power, RC oscillating circuit clocking also exported microcontroller to.
Step S102 receives the detected ambient temperature of temperature sensing circuit.
Need to prove that temperature sensing circuit detects the ambient temperature of the residing operational environment of RC oscillating circuit in real time, and in real time the temperature value of the ambient temperature that gets access to is sent to the correction module of microcontroller.
As one embodiment of the invention, the temperature sensing circuit that described temperature sensing circuit is formed for the resistance that adopts negative temperature coefficient.
More optimizedly, when the design temperature testing circuit, select the high temperature detection components and parts of accuracy of detection for use, the correction module of microcontroller is finely tuned the clock signal that receives RC oscillating circuit output in real time, with the clock signal after the fine setting more near the required clock signal of microcontroller.
Step S103 according to described ambient temperature, proofreaies and correct the clock frequency of described clock signal.
After the ambient temperature that gets access to RC oscillating circuit environment of living in, judge whether the temperature value of this ambient temperature is identical with the temperature value of optimum working temperature, as if inequality, then in the temperature frequency line, find out the corresponding clock frequency of temperature value of this ambient temperature; Because the clock frequency of the clock signal that the microcontroller of known optimum working temperature correspondence is required, the clock frequency that calculates the required clock signal of microcontroller deducts the difference of the clock frequency that finds out from the temperature frequency table; Correction module in the microcontroller is after the clock signal that gets access to the output of RC oscillating circuit, the clock frequency of clock signal that get access to, RC oscillating circuit output is added that the clock signal after this difference uses as the required clock signal of microcontroller, thereby proofreaied and correct the clock frequency of the clock signal of RC oscillating circuit output effectively.
As one embodiment of the invention, according to described ambient temperature, proofread and correct the step of the clock frequency of described clock signal, can for:
According to described ambient temperature, from the temperature and frequency correcting table, extract the first frequency correction parameter;
Proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter.
Particularly, after getting access to the residing ambient temperature of RC oscillating circuit, whether the temperature value of judging this ambient temperature is identical with described optimum working temperature, as if inequality, then finds out the clock frequency of the temperature value correspondence of this ambient temperature from the temperature and frequency correcting table; The clock frequency that microcontroller is required deducts the difference of the clock frequency that finds out as the first frequency correction parameter; Correction module in the microcontroller is after the clock frequency of the clock signal that gets access to the output of RC oscillating circuit, the clock frequency that gets access to is added the first frequency correction parameter using as the required clock frequency of microcontroller, with the purpose of the clock frequency that reaches the clock signal of proofreading and correct the output of RC oscillating circuit.
In addition, owing to the clock frequency of the clock signal of RC oscillating circuit output is drifted about by the variation of the ambient temperature of RC oscillating circuit environment of living in not only, and, when the operating voltage that the RC oscillating circuit is provided changed, the clock frequency of the clock signal of RC oscillating circuit output also can change.Thereby the clock signal generation method of the microcontroller that present embodiment provides also comprises:
Step S104 receives the detected voltage of voltage detecting circuit.
Because when RC oscillating circuit operating state changes, the voltage of whole RC oscillating circuit will change; Present embodiment adopts voltage detecting circuit to detect the voltage that drives the work of RC oscillating circuit in real time.
As one embodiment of the invention, voltage detecting circuit can adopt the resistance for voltage detecting to insert in the input parallel connection of RC oscillating circuit, and the voltage at these resistance two ends is the voltage that drives the work of whole RC oscillating circuit.
Step S105 according to described voltage, proofreaies and correct the clock frequency of described clock signal.
After voltage detecting circuit to be detected detects the voltage that drives the work of RC oscillating circuit, the correction module of microcontroller receives this voltage in real time, whether the magnitude of voltage of judging this voltage is identical with optimum operating voltage, if inequality, then in the electric voltage frequency line, find out the clock frequency of clock signal of the RC oscillating circuit output of this magnitude of voltage correspondence; Because the clock frequency of the clock signal that the microcontroller of known optimum operating voltage correspondence is required, the clock frequency that calculates the required clock signal of microcontroller deducts the difference of this clock frequency that finds out from the electric voltage frequency table; Correction module in the microcontroller is after the clock signal that gets access to the output of RC oscillating circuit, the clock frequency of the clock signal that gets access to is added that the clock signal after this difference uses as the required clock signal of microcontroller, thereby proofreaied and correct the clock frequency of the clock signal of RC oscillating circuit output effectively.
As one embodiment of the invention, described according to described voltage, proofread and correct the step of the clock frequency of described clock signal, can for:
According to described voltage, from the electric voltage frequency checking list, extract the second frequency correction parameter;
Proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter.
Particularly, after the correction module of microcontroller receives the voltage that drives the work of RC oscillating circuit, whether the magnitude of voltage of judging this voltage is identical with optimum operating voltage, as if inequality, then finds out the clock frequency of this magnitude of voltage correspondence from the electric voltage frequency checking list; The clock frequency of the clock signal that microcontroller is required deducts the difference of the clock frequency that finds out as the second frequency correction parameter; Correction module in the microcontroller is after the clock signal that gets access to the output of RC oscillating circuit, the clock frequency of the clock signal that gets access to is added the above second frequency correction parameter use as the required clock frequency of microcontroller, thereby proofreaied and correct the clock frequency of the clock signal of RC oscillating circuit output effectively.
As another embodiment of the present invention, the present invention also provides a kind of clock signal generating device of microcontroller; Fig. 2 shows the composition structure of the clock signal generating device of the microcontroller that the embodiment of the invention provides, and for convenience of description, only shows the part relevant with the embodiment of the invention.
Need to prove that the clock signal generation method of the clock signal generating device of the microcontroller that present embodiment provides and above-mentioned microcontroller is suitable for mutually; The clock signal generating device of this microcontroller can be to run on the unit that software unit, hardware cell or software and hardware in the microcontroller combine, and also can be used as independently, suspension member is integrated in the microcontroller or runs in the application system of microcontroller.
Particularly, a kind of clock signal generating device of microcontroller, the clock signal generating device of described microcontroller comprises:
Correction module 21, be used for receiving the clock signal of RC oscillating circuit output, receive the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter;
Described correction parameter module 22 is used for the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
As another embodiment of the present invention, the present invention also provides a kind of microcontroller; Fig. 3 shows the physical circuit of the microcontroller that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
In microcontroller provided by the invention, described microcontroller comprises temperature sensing circuit 2, voltage detecting circuit 1 and RC oscillating circuit 4, and described microcontroller also comprises:
Signal receiving end, temperature detection end and voltage detecting end connect the output of described RC oscillating circuit 4 respectively, the output of the output of described temperature sensing circuit 2 and described voltage detecting circuit 1, be used for receiving the clock signal of RC oscillating circuit 4 outputs, receive temperature sensing circuit 2 detected ambient temperatures, from the temperature and frequency correcting table of correction parameter module 5, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive voltage detecting circuit 1 detected voltage, from the electric voltage frequency checking list of described correction parameter module 5, extract the second frequency correction parameter according to described voltage, proofread and correct the correction module 3 of the clock frequency of described clock signal according to described second frequency correction parameter;
Be connected with described correction module 3, be used for the described correction parameter module 5 of the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
As one embodiment of the invention, described correction parameter module 5 is stored in the memory.
After microcontroller worked on power, the signal receiving end of the correction module 3 of microcontroller received the clock signal of the output output of RC oscillating circuit 4.
Meanwhile, temperature sensing circuit 2 detects the ambient temperature of RC oscillating circuit 4 residing operational environments in real time, after the temperature detection end of correction module 3 receives this ambient temperature from the output of described temperature sensing circuit 2, judge whether this ambient temperature is identical with the suitable environment temperature, if it is different, then extract the first frequency correction parameter of this ambient temperature correspondence in the temperature and frequency correcting table from the correction parameter module 5 of memory device, described first frequency correction parameter is that the required clock frequency of microcontroller deducts this ambient temperature correspondence, the difference of the clock frequency of RC oscillating circuit 4 outputs; Correction module 3 adds that with the clock frequency of RC oscillating circuit 4 outputs this difference is with the clock signal use as microcontroller.
Meanwhile, voltage detecting circuit 1 detects the voltage that drives 4 work of RC oscillating circuit in real time, after the voltage detecting end of correction module 3 receives this magnitude of voltage from the output of described voltage detecting circuit 1, judge whether this magnitude of voltage is identical with the suitable environment temperature, if it is different, then in the electric voltage frequency checking list from the correction parameter module 5 of memory device, extract the second frequency correction parameter of this magnitude of voltage correspondence, described second frequency correction parameter is that the required clock frequency of microcontroller deducts this magnitude of voltage correspondence, the difference of the clock frequency of RC oscillating circuit 4 outputs; Correction module 3 adds that with the clock frequency of RC oscillating circuit 4 outputs this difference is with the clock signal use as microcontroller.
In embodiments of the present invention, the RC oscillating circuit generates clock signal, and the correction module of microcontroller receives this clock signal of RC oscillating circuit output; Meanwhile, temperature sensing circuit detects the ambient temperature of RC oscillating circuit environment of living in real time, the correction module of microcontroller receives the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter; Meanwhile, voltage detecting circuit detects to the driving voltage of RC oscillating circuit input, the correction module of microcontroller receives the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter; Thereby, the embodiment of the invention changes according to the operating voltage of variation of ambient temperature, RC oscillator, the clock frequency of the clock signal of correction RC oscillator output in real time guarantees effectively that to satisfy the required clock frequency of microcontroller microcontroller is with same frequency operate as normal.
It will be appreciated by those skilled in the art that each unit that the clock signal generating device of the described microcontroller that provides for above-described embodiment comprises is just divided according to function logic, but be not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the clock signal generation method of a microcontroller is characterized in that, the clock signal generation method of described microcontroller comprises:
Receive the clock signal of RC oscillating circuit output;
Receive the detected ambient temperature of temperature sensing circuit;
According to described ambient temperature, proofread and correct the clock frequency of described clock signal;
Receive the detected voltage of voltage detecting circuit;
According to described voltage, proofread and correct the clock frequency of described clock signal.
2. the clock signal generation method of microcontroller as claimed in claim 1 is characterized in that, according to described ambient temperature, proofreaies and correct the step of the clock frequency of described clock signal, is specially:
According to described ambient temperature, from the temperature and frequency correcting table, extract the first frequency correction parameter;
Proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter.
3. the clock signal generation method of microcontroller as claimed in claim 1 is characterized in that, and is described according to described voltage, proofreaies and correct the step of the clock frequency of described clock signal, is specially:
According to described voltage, from the electric voltage frequency checking list, extract the second frequency correction parameter;
Proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter.
4. the clock signal generating device of a microcontroller is characterized in that, the clock signal generating device of described microcontroller comprises:
Correction module, be used for receiving the clock signal of RC oscillating circuit output, receive the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the clock frequency of described clock signal according to described second frequency correction parameter;
Described correction parameter module is used for the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
5. microcontroller, described microcontroller comprises temperature sensing circuit, voltage detecting circuit and RC oscillating circuit, it is characterized in that, described microcontroller also comprises:
Signal receiving end, temperature detection end and voltage detecting end connect the output of described RC oscillating circuit respectively, the output of described temperature sensing circuit and the output of described voltage detecting circuit, be used for receiving the clock signal of RC oscillating circuit output, receive the detected ambient temperature of temperature sensing circuit, from the temperature and frequency correcting table of correction parameter module, extract the first frequency correction parameter according to described ambient temperature, proofread and correct the clock frequency of described clock signal according to described first frequency correction parameter, receive the detected voltage of voltage detecting circuit, from the electric voltage frequency checking list of described correction parameter module, extract the second frequency correction parameter according to described voltage, proofread and correct the correction module of the clock frequency of described clock signal according to described second frequency correction parameter;
Be connected with described correction module, be used for the described correction parameter module of the described temperature and frequency correcting table of storage and described electric voltage frequency checking list.
6. microcontroller as claimed in claim 5 is characterized in that, described correction parameter module stores is in a memory.
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| CN104143960A (en) * | 2014-07-11 | 2014-11-12 | 钜泉光电科技(上海)股份有限公司 | Overflow compensating method and device for correcting MEMS elapsed time clock |
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| CN111404484A (en) * | 2020-04-26 | 2020-07-10 | 珠海迈巨微电子有限责任公司 | RC oscillator and electric device |
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Application publication date: 20131009 |