CN101710251A - Single chip microcomputer halt reset circuit, device and method - Google Patents
Single chip microcomputer halt reset circuit, device and method Download PDFInfo
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- CN101710251A CN101710251A CN200910188833A CN200910188833A CN101710251A CN 101710251 A CN101710251 A CN 101710251A CN 200910188833 A CN200910188833 A CN 200910188833A CN 200910188833 A CN200910188833 A CN 200910188833A CN 101710251 A CN101710251 A CN 101710251A
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Abstract
The invention relates to single chip microcomputer halt reset circuit, a device and a method. The single chip microcomputer halt reset circuit is connected with an output port and a reset port of a single chip microcomputer and comprises a signal detection circuit, a switching circuit and a control circuit, wherein the signal detection circuit is connected with the output port of the single chip microcomputer and used for detecting the output signal of the single chip microcomputer and producing a detection voltage; the switching circuit is connected with the signal detection circuit and used for producing a pulse signal according to the detection voltage; and the control circuit is respectively connected with the switching circuit and the reset port and used for generating a triggering signal according to the pulse signal and triggering the reset of the single chip microcomputer. The single chip microcomputer halt reset circuit, the device and the method of the invention enable the single chip microcomputer to produce a low-level reset signal and trigger the reset of the single chip microcomputer when the single chip microcomputer halts; and after the reset signal is charged into high level, the single chip microcomputer stops reset, so that the single chip microcomputer can automatically reset reliably in case of a halt and can not halt for a long time, thereby enhancing the reliability of the halt reset of the single chip microcomputer.
Description
Technical field
The present invention relates to the Single-chip Controlling field, particularly a kind of automatic reset circuit of single chip microcomputer halt, device and method.
Background technology
Single-chip microcomputer is widely used in fields such as household electrical appliances, medical treatment, instrument and meter, industrial automation, Aero-Space, has brought a lot of facilities to people.In order to guarantee the steady operation of single-chip microcomputer, the reliability of reset circuit of SCM is vital.The basic reset circuit of existing single-chip microcomputer comprises the RC reset circuit, as shown in Figure 1.This RC reset circuit makes reset signal is provided when system powers on, cancel reset signal behind system stability.
But this RC reset circuit can not make capacitor C discharge rapidly in power supply power-fail moment, and single-chip microcomputer can't reliable reset, thereby the system that makes is absorbed in endless loop and cisco unity malfunction.
Summary of the invention
Goal of the invention of the present invention provides a kind of single chip microcomputer halt reset circuit, is intended to improve the high reliability that single chip microcomputer halt resets.
This single chip microcomputer halt reset circuit is connected with single machine output end and reseting port, comprising:
Signal deteching circuit, on-off circuit and control circuit, signal deteching circuit is connected with single machine output end, detects the output signal of single-chip microcomputer, and produces detection voltage; On-off circuit is connected with signal deteching circuit, produces pulse signal according to described detection voltage; Control circuit is connected with on-off circuit and reseting port respectively, produces trigger pip according to pulse input signal, exports the reseting port of single-chip microcomputer to.
Preferably, said switching circuit comprises: status circuit and pulse-generating circuit, and status circuit is connected with signal deteching circuit, and according to the detection voltage of signal deteching circuit, it is first state or second state that its state is set; Pulse-generating circuit is connected with status circuit, and the state that is in according to status circuit produces described pulse signal.
Preferably, above-mentioned status circuit comprises first switching device and second switch device, and the base stage of described first switching device is connected with signal deteching circuit, and collector is connected grounded emitter with the base stage of second switch device; The collector of above-mentioned second switch device is connected grounded emitter with above-mentioned pulse-generating circuit; Above-mentioned first state is the first switching device conducting, and the state that ends of second switch device; Above-mentioned second state is that first switching device ends, and the state of second switch break-over of device;
Above-mentioned pulse-generating circuit comprises power supply, first electric capacity, diode, and wherein first electric capacity is connected with the collector of second switch device and the positive pole of diode respectively; The positive pole of above-mentioned diode also is connected with control circuit, and negative pole is connected with power supply; This pulse-generating circuit produces pulse signal according to the change in voltage of the collector of second switch device.
Preferably, above-mentioned control circuit comprises: the 3rd switching device, pull-up resistor, second electric capacity and monostable circuit, and wherein monostable circuit is connected with pulse-generating circuit, produces drive signal according to pulse input signal; The base stage of the 3rd switching device is connected with monostable circuit, collector is connected with the reseting port of single-chip microcomputer, grounded emitter, the 3rd switching device is in conducting or cut-off state according to the drive signal that described monostable circuit produces, and its collector produces trigger pip;
Above-mentioned pull-up resistor is connected with the collector of the 3rd switching device; Second electric capacity is connected with the collector and the emitter of second switch device respectively.
The invention allows for a kind of single chip microcomputer halt resetting means, comprise single chip microcomputer halt reset circuit, this single chip microcomputer halt reset circuit is used to detect the output signal of single-chip microcomputer, and produces detection voltage; Produce pulse signal according to described detection voltage; Produce trigger pip according to pulse signal, export reseting port to.
The invention allows for a kind of single chip microcomputer halt repositioning method, may further comprise the steps:
Obtain the output signal of single-chip microcomputer, and produce detection voltage;
Produce pulse signal according to detecting voltage;
Produce trigger pip according to pulse signal, trigger single-chip microcomputer and reset.
Preferably, above-mentioned step according to detection voltage generation pulse signal comprises:
Judge according to detecting voltage whether single-chip microcomputer is in the deadlock state, is then to produce undersuing, otherwise keep high level signal.
Preferably, above-mentioned step according to pulse signal generation trigger pip comprises:
Judge whether described pulse signal is undersuing, is then to produce the low level pulse signal, otherwise produce high level signal.
Preferably, the above-mentioned step of obtaining the output signal of single-chip microcomputer also comprises before:
The output signal of single-chip microcomputer is set; When single-chip microcomputer is in the deadlock state, stop to export square-wave signal, when described single-chip microcomputer is in normal operating conditions, the output square-wave signal.
Single chip microcomputer halt reset circuit of the present invention, device and method by the output signal of automatic detection single-chip microcomputer, and according to output signal generation trigger pip, trigger the single-chip microcomputer reset operation.Therefore, when single chip microcomputer halt, single chip microcomputer halt reset circuit will produce low level pulse reset signal according to the output signal of single-chip microcomputer, trigger single-chip microcomputer and reset; After treating that reset signal is charged as high level, single-chip microcomputer stops to reset, and makes single-chip microcomputer automatically reset reliably when occurring crashing, and the long-term problem that crashes can not occur, and has improved the reliability that single chip microcomputer halt resets.
Description of drawings
Fig. 1 is the structural representation of single chip microcomputer halt reset circuit in the prior art;
Fig. 2 is the structured flowchart of single chip microcomputer halt reset circuit during the present invention first implements;
Fig. 3 is the structural representation of single chip microcomputer halt reset circuit in the embodiment of the foregoing description;
Fig. 4 is the schematic flow sheet of single chip microcomputer halt repositioning method in the second embodiment of the invention.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
With reference to Fig. 2, the single chip microcomputer halt reset circuit of first embodiment has been proposed.This single chip microcomputer halt reset circuit 1 is connected with the output port PX-X and the reseting port RESET of single-chip microprocessor MCU, comprises signal deteching circuit 10, on-off circuit 20 and control circuit 30.Signal deteching circuit 10 is connected with the output port PX-X of single-chip microprocessor MCU, detects the output signal of single-chip microprocessor MCU, and produces detection voltage.On-off circuit 20 is connected with signal deteching circuit 10, produces pulse signal according to the driving that detects voltage.Control circuit 30 is connected with the reseting port RESET of on-off circuit 20 and MCU respectively, produces trigger pip according to pulse input signal, triggers single-chip microprocessor MCU and resets.
With reference to Fig. 3, said switching circuit 20 comprises status circuit 21 and pulse-generating circuit 22.Status circuit 21 is connected with signal deteching circuit 10, can the received signal testing circuit 10 detection voltages that produce and be in first state or second state.Pulse-generating circuit 22 is connected with status circuit 21, can produce pulse signal according to status circuit 21 residing states.
Pulse-generating circuit 22 is connected with above-mentioned status circuit 21, produces pulse signal according to status circuit 21 residing states.Preferably, this pulse-generating circuit 22 comprises first capacitor C 1 and diode D2.First capacitor C 1 is connected with the collector of second switch device TR2 and the positive pole of diode D2 respectively.The negative pole of diode D2 is connected with+5V power supply.When the collector terminal of second switch device TR2 was high level signal, pulse-generating circuit 22 produced high level signal.When the current collection of the 3rd switching element T R3 very during low level signal, pulse-generating circuit 22 produces undersuings.
Above-mentioned control circuit 30 comprises the 3rd switching element T R3, pull-up resistor R9 and monostable circuit 31.Monostable circuit 31 is connected with above-mentioned pulse-generating circuit 22, produces drive signal according to pulse input signal.The base stage of the 3rd switching element T R3 is connected with monostable circuit 31, and collector is connected grounded emitter with the reseting port RESET of single-chip microprocessor MCU.Pull-up resistor R9 is connected with the collector of the 3rd switching element T R3.The 3rd switching element T R3 is in conducting or cut-off state according to the drive signal that above-mentioned monostable circuit 31 produces, and produces trigger pip in collector terminal, is sent to the reseting port RESET of single-chip microcomputer.For example, when the pulse signal of pulse-generating circuit 22 generations was undersuing, monostable circuit 31 was triggered and produces the pulse signal of high level.The 3rd switching element T R3 is subjected to the driving of high level signal and is in conducting state, its collector terminal output low level pulse signal.The reseting port RESET of single-chip microprocessor MCU carries out reset operation after receiving this low level pulse signal.After monostable circuit was exported a fixed width pulse high level, with regard to output low level, the 3rd switching element T R3 ended.After reseting port was charged as high level, single-chip microcomputer stopped to reset, and program run continues at PX.X end output square-wave signal, and single-chip microcomputer enters normal operating conditions.
Preferably, above-mentioned monostable circuit 31 can be monostalbe trigger.When trigger pip was negative pulse, monostalbe trigger just was triggered and produces the high level pulse signal of fixed width.When monostalbe trigger is not triggered, the output low level signal.
Above-mentioned control circuit 30 also comprises second capacitor C 2, and this second capacitor C 2 is connected with collector and the emitter of above-mentioned the 3rd switching element T R3 respectively.When the 3rd switching element T R3 be in by the time, the voltage of its collector terminal reaches high level signal after treating by pull-up resistor R9 second capacitor C 2 to be charged.This charging process makes single-chip microcomputer form buffering between the operate as normal by resetting to, and has guaranteed the reliability that resets more.
The output signal of above-mentioned single-chip microprocessor MCU when single-chip microprocessor MCU crashes occurring unusual, stops output signal by programmed control.When single-chip microcomputer is in normal duty, the output square-wave signal.And the instruction of output square-wave signal is placed in the master routine, has prevented that single-chip microcomputer from long-term situation about crashing occurring and taking place.Therefore, when single chip microcomputer halt, the single chip microcomputer halt of the present embodiment electricity that resets produces low level reset signal according to the output signal of single-chip microcomputer, triggers single-chip microcomputer and resets.After treating that reseting port is charged as high level, single-chip microcomputer stops to reset.Single chip microcomputer halt reset circuit of the present invention has guaranteed that by software and hardware combining single-chip microcomputer automatically resets reliably when occurring crashing, the long-term problem that crashes can not occur, and has improved the reliability that single chip microcomputer halt resets.
On the basis of first embodiment, the invention allows for the single chip microcomputer halt resetting means of second embodiment, comprise the single chip microcomputer halt reset circuit among first embodiment, this circuit can detect the output signal of single-chip microcomputer, and produces detection voltage; Produce pulse signal according to described detection voltage; Produce trigger pip according to pulse signal, export reseting port to.
The single chip microcomputer halt resetting means of present embodiment is integrated in the single chip microcomputer halt reset circuit of first embodiment on the PCB circuit board, and the IO interface that is connected with single-chip microcomputer of setting, make this single chip microcomputer halt resetting means can use on different single-chip microcomputers, saved cost.
With reference to Fig. 4, the single chip microcomputer halt repositioning method of second embodiment has been proposed.This method may further comprise the steps:
S01: obtain the output signal of single-chip microcomputer, and produce detection voltage;
S02: produce pulse signal according to detecting voltage;
S03: produce trigger pip according to pulse signal, reset for Single-chip Controlling.
Among the step S01, be connected with single machine output end, and produce detection voltage according to output signal by signal deteching circuit.And also comprise before the step S01: the output signal that single-chip microcomputer is set.When single-chip microcomputer is in the deadlock state, stop to export square-wave signal, then the detection voltage of signal deteching circuit generation is zero.When single-chip microcomputer is in normal operating conditions, the output square-wave signal, then the detection voltage of signal deteching circuit generation is a direct current voltage.
Among the step S02, receive the driving that detects voltage by status circuit and be in first state or second state, pulse-generating circuit produces pulse signal according to the state of status circuit.When detection voltage was DC voltage, status circuit was in first state, and pulse-generating circuit produces high level signal; When detection voltage was zero, pulse-generating circuit produced undersuing.
Among the step S03,, produce trigger pip by the control of control circuit received pulse signal.When pulse signal is negative pulse, produce low level pulse triggering signal, export the reseting port of single-chip microcomputer to, trigger single-chip microcomputer and reset.When the single-chip microcomputer reseting port was charged as high level, single-chip microcomputer stopped to reset.
The single chip microcomputer halt repositioning method of present embodiment is by obtaining the output signal of single-chip microcomputer, and produces trigger pip according to this output signal, triggers single-chip microcomputer and resets.And, when crashing appears in single-chip microcomputer, single-chip microcomputer stops output signal, make the single chip microcomputer halt reset circuit of present embodiment produce trigger pip according to this output signal, the triggering single-chip microcomputer resets, guaranteed that single-chip microcomputer automatically resets reliably when occurring crashing, the long-term problem that crashes can not occur, improved the reliability that single chip microcomputer halt resets.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. single chip microcomputer halt reset circuit, be connected with single machine output end and reseting port, it is characterized in that, comprise: signal deteching circuit, on-off circuit and control circuit, signal deteching circuit is connected with single machine output end, detect the output signal of single-chip microcomputer, and produce detection voltage; On-off circuit is connected with signal deteching circuit, produces pulse signal according to described detection voltage; Control circuit is connected with on-off circuit and reseting port respectively, produces trigger pip according to pulse signal, exports reseting port to.
2. single chip microcomputer halt reset circuit as claimed in claim 1, it is characterized in that, described on-off circuit comprises: status circuit and pulse-generating circuit, status circuit is connected with described signal deteching circuit, according to the detection voltage of signal deteching circuit, it is first state or second state that its state is set; Pulse-generating circuit is connected with status circuit, and the state that is in according to status circuit produces described pulse signal.
3. single chip microcomputer halt reset circuit as claimed in claim 2, it is characterized in that described status circuit comprises first switching device and second switch device, the base stage of described first switching device is connected with signal deteching circuit, collector is connected grounded emitter with the base stage of second switch device; The collector of described second switch device is connected grounded emitter with described pulse-generating circuit; Described first state is the first switching device conducting, and the state that ends of second switch device; Described second state is that first switching device ends, and the state of second switch break-over of device;
Described pulse-generating circuit comprises power supply, first electric capacity, diode, and described electric capacity is connected with the collector of second device and the positive pole of diode respectively; The positive pole of described first diode also is connected with control circuit, and negative pole is connected with power supply; This pulse-generating circuit produces pulse signal according to the change in voltage of the collector of second device.
4. single chip microcomputer halt reset circuit as claimed in claim 3, it is characterized in that, described control circuit comprises: the 3rd switching device, pull-up resistor, second electric capacity and monostable circuit, and described monostable circuit is connected with pulse-generating circuit, produces drive signal according to pulse input signal; The base stage of described the 3rd switching device is connected with monostable circuit, collector is connected with the reseting port of single-chip microcomputer, grounded emitter, the 3rd switching device is in conducting or cut-off state according to the drive signal that described monostable circuit produces, and its collector produces trigger pip; Described pull-up resistor is connected with the collector of the 3rd switching device; Described second electric capacity is connected with the collector and the emitter of second switch device respectively.
5. a single chip microcomputer halt resetting means is characterized in that, comprising: single chip microcomputer halt reset circuit, detect the output signal of single-chip microcomputer, and produce detection voltage; Produce pulse signal according to described detection voltage; Produce trigger pip according to pulse signal, export reseting port to.
6. single chip microcomputer halt resetting means as claimed in claim 5 is characterized in that, described single chip microcomputer halt reset circuit is any described single chip microcomputer halt reset circuit of claim 1 to 4.
7. a single chip microcomputer halt repositioning method is characterized in that, may further comprise the steps:
Obtain the output signal of single-chip microcomputer, and produce detection voltage;
Produce pulse signal according to detecting voltage;
Produce trigger pip according to pulse input signal, reset for Single-chip Controlling.
8. single chip microcomputer halt repositioning method as claimed in claim 7 is characterized in that, described step according to detection voltage generation pulse signal comprises:
Judge according to detecting voltage whether single-chip microcomputer is in the deadlock state, is then to produce undersuing, otherwise keep high level signal.
9. single chip microcomputer halt repositioning method as claimed in claim 8 is characterized in that, described step according to pulse input signal generation trigger pip comprises:
Judge that whether described pulse signal is undersuing, is then to produce the low level pulse signal, otherwise keeps high level signal.
10. single chip microcomputer halt repositioning method as claimed in claim 9 is characterized in that, the described step of obtaining the output signal of single-chip microcomputer also comprises before:
The output signal of single-chip microcomputer is set; When single-chip microcomputer is in the deadlock state, stop to export square-wave signal, when described single-chip microcomputer is in normal operating conditions, the output square-wave signal.
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| CN200910188833A CN101710251A (en) | 2009-12-11 | 2009-12-11 | Single chip microcomputer halt reset circuit, device and method |
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| CN200910188833A CN101710251A (en) | 2009-12-11 | 2009-12-11 | Single chip microcomputer halt reset circuit, device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102368171A (en) * | 2011-09-19 | 2012-03-07 | 惠州Tcl移动通信有限公司 | Automatic recovering system of touch screen controller |
| CN102608937A (en) * | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Peripheral circuit control device and control method thereof |
| CN102929734A (en) * | 2012-10-19 | 2013-02-13 | 浪潮电子信息产业股份有限公司 | Method for automatic dead halt state detecting and resetting of memory |
| CN103647534A (en) * | 2013-11-29 | 2014-03-19 | 青岛歌尔声学科技有限公司 | Key reset circuit of electronic equipment |
| CN106569570A (en) * | 2016-10-20 | 2017-04-19 | 上海传英信息技术有限公司 | Hardware power-off circuit and method |
| CN107368171A (en) * | 2017-07-20 | 2017-11-21 | 朱伟 | A kind of reset circuit of closed-loop control |
| CN109086159A (en) * | 2018-09-04 | 2018-12-25 | 环胜电子(深圳)有限公司 | Crash detection module and its method |
| CN111427715A (en) * | 2020-04-14 | 2020-07-17 | 深圳市迈威芯片设计有限公司 | Detection and recovery device for single chip microcomputer crash |
| CN111949105A (en) * | 2020-07-27 | 2020-11-17 | 美唐科技(江苏)有限公司 | System starting circuit of handheld terminal based on high-voltage battery power supply |
| CN112748788A (en) * | 2020-12-31 | 2021-05-04 | 美智光电科技股份有限公司 | Reset method and device, single chip device, door lock and readable storage medium |
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- 2009-12-11 CN CN200910188833A patent/CN101710251A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102368171A (en) * | 2011-09-19 | 2012-03-07 | 惠州Tcl移动通信有限公司 | Automatic recovering system of touch screen controller |
| CN102368171B (en) * | 2011-09-19 | 2013-07-03 | 惠州Tcl移动通信有限公司 | Automatic recovering system of touch screen controller |
| CN102608937A (en) * | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Peripheral circuit control device and control method thereof |
| CN102929734A (en) * | 2012-10-19 | 2013-02-13 | 浪潮电子信息产业股份有限公司 | Method for automatic dead halt state detecting and resetting of memory |
| CN103647534A (en) * | 2013-11-29 | 2014-03-19 | 青岛歌尔声学科技有限公司 | Key reset circuit of electronic equipment |
| CN103647534B (en) * | 2013-11-29 | 2016-06-08 | 青岛歌尔声学科技有限公司 | The key reset circuit of a kind of electronics |
| CN106569570A (en) * | 2016-10-20 | 2017-04-19 | 上海传英信息技术有限公司 | Hardware power-off circuit and method |
| CN107368171A (en) * | 2017-07-20 | 2017-11-21 | 朱伟 | A kind of reset circuit of closed-loop control |
| CN107368171B (en) * | 2017-07-20 | 2019-10-22 | 北京永安多谱检测科技有限公司 | A kind of reset circuit of closed-loop control |
| CN109086159A (en) * | 2018-09-04 | 2018-12-25 | 环胜电子(深圳)有限公司 | Crash detection module and its method |
| CN111427715A (en) * | 2020-04-14 | 2020-07-17 | 深圳市迈威芯片设计有限公司 | Detection and recovery device for single chip microcomputer crash |
| CN111949105A (en) * | 2020-07-27 | 2020-11-17 | 美唐科技(江苏)有限公司 | System starting circuit of handheld terminal based on high-voltage battery power supply |
| CN111949105B (en) * | 2020-07-27 | 2022-02-18 | 美唐科技(江苏)有限公司 | System starting circuit of handheld terminal based on high-voltage battery power supply |
| CN112748788A (en) * | 2020-12-31 | 2021-05-04 | 美智光电科技股份有限公司 | Reset method and device, single chip device, door lock and readable storage medium |
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Application publication date: 20100519 |