CN207382278U - A kind of more key combination hardware reset circuits and electronic product - Google Patents
A kind of more key combination hardware reset circuits and electronic product Download PDFInfo
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- CN207382278U CN207382278U CN201721553226.XU CN201721553226U CN207382278U CN 207382278 U CN207382278 U CN 207382278U CN 201721553226 U CN201721553226 U CN 201721553226U CN 207382278 U CN207382278 U CN 207382278U
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Abstract
The utility model discloses a kind of more key combination hardware reset circuits and electronic product, including multiple buttons, on-off circuit, RC charging circuits and reset switch pipe；In the multiple button, at least one button is connected between the on-off circuit and the charging circuit of electronic product, remaining button is connected between the on-off circuit and the system power supply of electronic product；The on-off circuit is turned on when the multiple button is pressed and has charge power supply access on charging circuit, and the system power supply or charge power supply is controlled to charge RC charging circuits；The RC charging circuits connect the reset switch pipe, when the voltage on RC charging circuits is more than the conducting voltage of reset switch pipe, the reset switch pipe are controlled to turn on, generate reset signal.The reset circuit of the utility model can solve caused by user misoperation system and miss reset issues, while system operation reliability is improved, also solve the problems, such as system software it is stuck after reparation.
Description
Technical field
The utility model belongs to electronic circuit technology field, is related to a kind of reset circuit, is to be related to a kind of profit specifically
To electronic product reset the circuit design of operation with reset key.
Background technology
Reset circuit is that one kind is widely used in electronic product, is specially set to improve electronic product reliability of operation
The tandem circuit of meter.It is dead that many electronic products are present with Cartridge once in a while in the process of running（It crashes）Situation, run into this
During situation, if without manipulable hardware reset button or other resetting apparatuses, it can only take and directly power off or tear open machine
The mode reprocessed resets system software, makes system roll-back, not only troublesome in poeration, but also can cause the time
On unnecessary waste.Therefore, reset circuit is designed on electronic product is very important.
Existing reset circuit is mostly key reset circuit, i.e. independent reset key is designed on electronic product, specially
Door operates for resetting.This reset key usually only sets one, when system is stuck, by pressing the reset key,
Can Control System Software reset, restart operation.This key reset circuit design method is used on electronic product, often
There is electronic product in normal course of operation since user accidentally presses reset key, and cause system software mistakenly
Into the situation of reset state, so as to affect the usage experience of the normal operation of electronic product and user.
In order to avoid the maloperation of user, reset key is embedded in the housing of product by some electronic products completely, i.e.,
Design resets pin hole on the housing of electronic product, and reset key is built in and is resetted in pin hole, by triggering answering in pin hole
Position button, control system reset.This design method by reset key by being arranged at the not accessible position of user, although can
To solve the problems, such as reset by mistake, but user is when each execution resets operation, it is necessary to find a kind of needlelike object and extend into again
In the pin hole of position, reset key can be just touched, performs and resets operation, this undoubtedly adds user and performs the difficulty for resetting operation.
In addition some electronic products are resetted by the way of single-button long-press, although easy to operate, the usage experience of user
It is bad.
The content of the invention
The purpose of this utility model is to provide a kind of more key combination hardware reset circuits, and reset is performed facilitating user
While operation, the probability for resetting and occurring by mistake can be reduced as much as possible.
In order to solve the above technical problems, the utility model is achieved using following technical scheme：
The utility model is in one aspect, it is proposed that a kind of more key combination hardware reset circuits are applied chargeable
In electronic product, including multiple buttons, on-off circuit, RC charging circuits and reset switch pipe；In the multiple button, at least
It is connected to there are one button between the on-off circuit and the charging circuit of electronic product, remaining button is connected to described open
Between powered-down road and the system power supply of electronic product；The on-off circuit is pressed and the charging wire in the multiple button
Road turns on when having charge power supply access, and the system power supply or charge power supply is controlled to charge the RC charging circuits；It is described
RC charging circuits connect the reset switch pipe, when the voltage on RC charging circuits is more than the conducting voltage of reset switch pipe,
The reset switch pipe is controlled to turn on, generates reset signal.
In order to ensure electronic product when crashing, the reset circuit can normal operation, the system power supply should select
The cell voltage either electronic product of rechargeable battery output in electronic product remains to continue to keep straight under crash state
Galvanic electricity pressure.
Preferably, connect the charging circuit by key connection be electronic product charging interface, by the charging
The external power supply of mouth access is as the charge power supply；Alternatively, connect the charging circuit by key connection is a voltage stabilizing
The output terminal of circuit, the regulator circuit enable operation when there is external power supply access on the charging interface of electronic product, externally
Portion's power supply exports the charge power supply by its output terminal after carrying out voltage stabilizing conversion.
Further, the button includes two, is respectively the first button and the second button；It is set in the on-off circuit
It is equipped with first switching element and second switch element；Wherein, the second switch element passes through the second charging as described in key connection
Circuit is turned on described second as when having charge power supply access in key pressing and charging circuit；The first switching element passes through
First as described in key connection system power supply, described first by key pressing and second switch element conductive when turn on, described in control
System power supply charges to the RC charging circuits.
Further, the switch ways of the first switching element are connected to first button and RC charging electricity
Between road, the control terminal of the first switching element is grounded by the switch ways of the second switch element, and described second opens
Close element control terminal by described second as described in key connection charging circuit.
Preferably, the first switching element is preferably a PNP type triode, by the emitter of the PNP type triode
First button is connected, and passes through the first divider resistance and connects its base stage, and the collector of the PNP type triode is connected
The RC charging circuits；The second switch element is preferably a N-channel MOS pipe, and the drain electrode of the N-channel MOS pipe is passed through
Second divider resistance connects the base stage of the PNP type triode, and the source electrode of the N-channel MOS pipe is grounded, grid connection institute
State the second button.
A kind of preferred circuit as the RC charging circuits designs, and includes an electric resistance partial pressure in the RC charging circuits
Network and at least one capacitance, the resistance pressure-dividing network are connected between the on-off circuit and ground, the electric resistance partial pressure net
The divider node of network connects the control terminal of the reset switch pipe by the capacity earth, to the reset switch pipe into
Row break-make controls.
Further, the control terminal of the reset switch pipe connects the RC charging circuits, and one end of switch ways connects
Lead to the system power supply, and connect the reset pin of master chip in electronic product, other end ground connection.
Preferably, the reset switch pipe is preferably a N-channel MOS pipe, and the grid of the N-channel MOS pipe is connected to
The RC charging circuits, source electrode ground connection, drain electrode connects the system power supply by current-limiting resistance, and connects main core in electronic product
The reset pin of piece.
The utility model is on the other hand, it has been proposed that a kind of electronic product, master chip, system including runtime program
Power supply, charging circuit and more key combination hardware reset circuits, more key combination hardware reset circuits include multiple buttons,
On-off circuit, RC charging circuits and reset switch pipe；In the multiple button, at least one button is connected to the switch
Between circuit and the charging circuit of electronic product, remaining button is connected to the system electricity of the on-off circuit and electronic product
Between source；The on-off circuit is turned on when the multiple button is pressed and has charge power supply access, controls the system
Power supply or charge power supply charge to the RC charging circuits；The RC charging circuits connect the reset switch pipe, when RC charges
When voltage on circuit is more than the conducting voltage of reset switch pipe, the reset switch pipe is controlled to turn on, generate reset signal；Institute
Master chip is stated when receiving the reset signal, control system Program reset.
Compared with prior art, the advantages of the utility model and good effect is：The utility model passes through in electronic product
It is upper that multiple buttons resetted for control system are set, and be only pressed in all reset keys and there is charge power supply to connect
When entering these conditions and meeting simultaneously, reset operation just is carried out to the system program of electronic product, it is possible thereby to solve substantially because with
System misses reset issues caused by the maloperation of family, while system operation reliability is improved, also solves system software card
Reparation problem after death.In addition, more key combination hardware reset circuits design of the utility model is simple, and it is at low cost, it is easy to real
It is existing, it is suitably applied in the chargeable electronic product of institute's operation button progress hardware reset in need, to improve the use of user
Experience.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Description of the drawings
Fig. 1 is a kind of circuit theory frame of the embodiment for more key combination hardware reset circuits that the utility model is proposed
Figure；
Fig. 2 is a kind of refinement schematic block circuit diagram of embodiment of more key combination hardware reset circuits shown in FIG. 1；
Fig. 3 is a kind of physical circuit schematic diagram of embodiment of more key combination hardware reset circuits shown in Fig. 2.
Specific embodiment
Specific embodiment of the present utility model is described in more detail below in conjunction with the accompanying drawings.
The present embodiment is directed to the chargeable electronic product using the design of button resetting technique, it is proposed that a kind of more buttons are answered
Position technology, by laying multiple buttons for control system Program reset on electronic product（The button can be special
In the button for resetting control or be also used as other function buttons for resetting control, such as volume+, volume-etc. buttons,
The present embodiment is hereafter referred to collectively as button）, and it is only complete in multiple buttons for reset control to design hardware reset circuit
Effective reset signal is just exported when portion is pressed and electronic product accesses charge power supply, Control System Software reset is restarted,
It is possible thereby to which the probability that maloperation occurs for user is greatly reduced, solve the problems, such as that system software resets by mistake.
As shown in Figure 1, the hardware reset circuit of the present embodiment mainly include it is multiple for reset buttons, on-off circuit,
The components such as RC charging circuits, reset switch pipe.Wherein, multiple buttons are for selectively by on-off circuit and electricity
System power supply in sub- product is connected with charging circuit, is controlled jointly using the charge power supply accessed in system power supply and charging circuit
On-off circuit conducting processed is charged so that system power supply or charge power supply can be RC charging circuits.Treat the electricity on RC charging circuits
Pressure rise to or more than reset switch pipe conducting voltage when, by the way that the conducting of reset switch pipe is controlled to generate needed for system
Reset signal then meets the reset requirement of electronic product system software.
In the present embodiment, at least select a button S2 be connected to on-off circuit and electronic product charging circuit it
Between, for when the button S2 is pressed, can the charge power supply that accessed in charging circuit be transmitted to the on-off circuit；
Remaining one or more can be connected to the system electricity of on-off circuit and electronic product for resetting the button S1 of control
Between source, for when the button S1 is pressed, system power supply can be transmitted to the on-off circuit.The on-off circuit
Turn-on condition be to receive the N road high level DC power supply identical with the number N of described button S1, S2.When N number of button
S1, S2 are pressed, and when receiving the DC power supply of N roads high level, the on-off circuit conducting, by RC charging circuits and institute
State system power supply or charge power supply connection, using the system power supply or charge power supply for RC charging circuits charging, with
In control reset switch pipe action, reset signal is generated.
The electronic product of the present embodiment is the chargeable electronic product for being configured with charging interface and rechargeable battery, it is contemplated that
The circuit module for being used to carry out cell voltage or charge power supply voltage stabilizing conversion in some electronic products is in by electronic product
The enabled control of master chip, when the system program run in master chip crashes, master chip possibly can not continue to output
Effective enable signal is unable to operate normally so as to cause these circuit modules, it is impossible to continue to output the system after voltage stabilizing conversion
Power supply or charge power supply.For this electronic product, in order to which the hardware reset circuit for ensureing the present embodiment can be in system in case of system halt
When normal operation, the button S1 for connecting system power supply is preferably connected to the leading-out terminal of rechargeable battery, rechargeable battery is exported
Cell voltage as the system power supply, for realizing break-make control to the on-off circuit in reset circuit.Similarly, preferably
The button S2 for connecting charging circuit is connected to the charging interface of electronic product, directly utilizes the charging electricity accessed on charging interface
Source carries out break-make control to the on-off circuit.This reset circuit hardware design can be adapted for various chargeable electron-like productions
Product as long as the rechargeable battery in electronic product has electricity, there is external power supply access on charging interface, you can control electronics production exactly
Product reset, therefore applied widely, versatile.
Certainly, for some electronic products, if after its system software crashes, in circuit system in addition to cell voltage also
During in the presence of the DC voltage that can continue to keep, button S1 can also be connected, equally using the DC voltage as system power supply
It can meet and the break-make of on-off circuit in reset circuit is controlled.Similarly, can be set in the charging circuit of electronic product straight
The regulator circuit that enabled control is carried out using the external power supply accessed on charging interface is connect, such as can be directly by voltage stabilizing electricity
The Enable Pin on road is connected to the charging interface of electronic product, when there is external power supply access on charging interface, the regulator circuit
Enabled operation after carrying out voltage stabilizing conversion to the external power supply, exports the charge power supply, is selectively passed via button S2
The on-off circuit in reset circuit is transported to, for carrying out break-make control to the on-off circuit.This reset circuit hardware is set
Meter can equally meet the reset control requirement of electronic product.
Consider for the convenience that operation is resetted to user, it is described to be preferably provided with two for resetting the button of control, one
A to be connected between system power supply and on-off circuit, another is connected between charge power supply and on-off circuit, in electronic product
Charging interface on be inserted into external power supply in the case of, user need to only press two buttons can control system parking position accuracy, by
This can not only solve the problems, such as the easy maloperation of single reset key, but also the reset operation of user will not be given to increase difficulty, convenient for user
Manipulation.
Below only exemplified by setting two for resetting the buttons of control, to the specific of the hardware reset circuit of the present embodiment
Circuit design is described in detail.
As shown in Fig. 2, situation of the present embodiment for two button S1, S2 for reset control, in reset circuit
Two switch elements in on-off circuit are set, are respectively first switching element and second switch element.Using the second button S2 and
Charge power supply carries out break-make control to second switch element, and when the first button S1 is pressed, utilizes the logical of second switch element
The on off operating mode of disconnected state change first switching element, and then when first switching element turns on, will connect the first button S1's
System power supply is transmitted to RC charging circuits, and charge control is carried out to RC charging circuits.
Specifically, the switch ways of first switching element can be connected to RC charging circuits and the first button S1 it
Between, and pass through the system power supply that the first button S1 is connected to electronic product.The control terminal of first switching element is opened by second
The switch ways ground connection of element is closed, and the control terminal of second switch element is connected to charging circuit by the second button S2.When
When external power supply is inserted on the charging interface of electronic product, just there is charge power supply access on charging circuit, if pressing second at this time
Button S2, the then controlled conducting of second switch element drag down the control terminal potential of first switching element, first switching element are controlled to lead
It is logical；At this point, if the first button S1 is pressed, system power supply is transmitted to RC by the first button S1 and first switching element and charges
Circuit charges to RC charging circuits.When the voltage on RC charging circuits rises to or conducting voltage more than reset switch pipe
When, the controlled conducting of reset switch pipe generates reset signal.
In the present embodiment, the control terminal of reset switch pipe can be connected to RC charging circuits, and by its switch ways
One end connected system power supply, and connect the reset pin of master chip in electronic product, other end ground connection, to be provided to master chip
The effective reset signal of low level.
The first switching element, second switch element and reset switch pipe may be employed a variety of switch elements and carry out circuit
Design, such as transistor, metal-oxide-semiconductor etc..The present embodiment selects PNP type triode, and as first switching element, N-channel MOS pipe is made
Exemplified by second switch element and reset switch pipe, the physical circuit design of the hardware reset circuit is described in detail.
As shown in figure 3, between the first button S1 is connected on the emitter of system power supply and PNP type triode Q1, it is described
The cell voltage VBAT that system power supply is preferably exported using rechargeable battery in electronic product, PNP type triode Q1 are opened as first
Close element, collector connection RC charging circuits, base stage is on the one hand by the first divider resistance R20 emitters of its own, separately
On the one hand the drain electrode of the second divider resistance R33 connection N-channel MOS pipes Q2 is passed through.The N-channel MOS pipe Q2 is as second switch
Element, source electrode ground connection, grid are connected to charging circuit by the second button S2 of series connection with it, are specifically connected to electronic product
Charging interface, for connecting the external power supply VBUS that charges to electronic product of external charge interface.In order to ensure N ditches
The grid voltage of road metal-oxide-semiconductor Q2 is stablized, and can also connect ground resistance R35 in the grid of N-channel MOS pipe Q2.
In the RC charging circuits of the present embodiment, the resistance pressure-dividing network being made of divider resistance R17, R18 is provided with, it will
The resistance pressure-dividing network is connected between the collector and ground of PNP type triode Q1, and intermediate divider node passes through capacitance C28
Or the parallel branch of capacitance C50 or capacitance C28 and C50 ground connection, and it is connected to the N-channel MOS pipe Q3 as reset switch pipe
Grid, by configuring the parameter value of resistance R17, R18 and capacitance C28, C50, to adjust the grid voltage of N-channel MOS pipe Q3
Rise to the time of its conducting voltage, and then the resetting time of control system.The source electrode of the N-channel MOS pipe Q3 is grounded, leakage
Pole is connected to system power supply, preferred battery voltage VBAT by current-limiting resistance R38, and passes through resistance R39 and be connected to electronic product
The reset pin RST of master chip provides the effective reset signal of low level, to control the system run in master chip to master chip
Program reliable reset.
The drain electrode of the N-channel MOS pipe Q3 can also be further grounded by filter capacitor C52, to filter out High-frequency Interference,
Stablize reset signal.
The operation principle of double key combination hardware reset circuits shown in Fig. 3 is：When the master chip operation in electronic product
System program when there is abnormal crash, insertion external power supply VBUS, is pressed simultaneously on the charging interface of electronic product
Button S1, S2.When button S2 is closed, N-channel MOS pipe Q2 conductings are grounded the second divider resistance R33.When button S1 is closed
When, cell voltage VBAT acts on the emitter of PNP type triode Q1, and passes through the partial pressure electricity of the first divider resistance R20 and second
After hindering R33 partial pressures, the base stage of PNP type triode Q1 is acted on.At this point, due to PNP type triode Q1 emitter and base stage it
Between voltage be more than its saturation conduction pressure drop, PNP type triode Q1 saturation conductions, connection cell voltage VBAT and RC charge electricity
Road, it is that capacitance C28, C50 in RC charging circuits charge to utilize battery voltage to VBAT.Treat that the voltage on capacitance C28, C50 rises
To N-channel MOS pipe Q3 saturation conduction pressure drop when, N-channel MOS pipe Q3 saturation conductions drag down its drain potential, and then put main core
The reset pin RST of piece is low level, so as to which master chip be controlled to reset, realizes the reset operation to electronic product.
As a kind of alternate design of hardware reset circuit shown in Fig. 3, P-channel metal-oxide-semiconductor may be employed as described first
Switch element, using NPN type triode as the second switch element and reset switch pipe；First button S1 can be connected to
Charging interface, to connect external power supply VBAT, the second button S2 can be connected to rechargeable battery, utilize battery voltage to VBAT controls
Second switch element conductive, this circuit design equally can provide low level effective reset signal for master chip, control electricity
Sub- product parking position accuracy after crash.
More key combination hardware reset circuits of the present embodiment, simple in structure, at low cost, flexible design reset reliably, can
To provide better usage experience to the user.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (10)
1. a kind of more key combination hardware reset circuits, are applied in chargeable electronic product, which is characterized in that including multiple
Button, on-off circuit, RC charging circuits and reset switch pipe；In the multiple button, at least one button is connected to institute
It states between on-off circuit and the charging circuit of electronic product, remaining button is connected to the on-off circuit and electronic product
Between system power supply；The on-off circuit is pressed in the multiple button and has charge power supply access on the charging circuit
When turn on, the system power supply or charge power supply is controlled to charge the RC charging circuits；Described in the RC charging circuits connection
Reset switch pipe when the voltage on RC charging circuits is more than the conducting voltage of reset switch pipe, controls the reset switch pipe
Conducting generates reset signal.
2. more key combination hardware reset circuits according to claim 1, which is characterized in that the system power supply is electronics
The cell voltage either electronic product of rechargeable battery output in product continues the DC voltage kept under crash state.
3. more key combination hardware reset circuits according to claim 1, which is characterized in that connect the charging circuit
By key connection be electronic product charging interface, using the external power supply that the charging interface accesses as described charging electricity
Source；Alternatively, connect the charging circuit by key connection be a regulator circuit output terminal, the regulator circuit electronics produce
Operation is enabled when having external power supply access on the charging interface of product, to defeated by its output terminal after external power supply progress voltage stabilizing conversion
Go out the charge power supply.
4. more key combination hardware reset circuits according to claim 1, which is characterized in that the button includes two,
Respectively the first button and the second button；First switching element and second switch element are provided in the on-off circuit；Its
In, the second switch element by second as described in key connection charging circuit, described second press key pressing and charging circuit
On turn on when having charge power supply access；The first switching element by first as described in key connection system power supply, described
One by key pressing and second switch element conductive when turn on, the system power supply is controlled to charge the RC charging circuits.
5. more key combination hardware reset circuits according to claim 4, which is characterized in that the first switching element
Switch ways are connected between first button and the RC charging circuits, and the control terminal of the first switching element passes through institute
The switch ways ground connection of second switch element is stated, the control terminal of the second switch element is by described second as described in key connection
Charging circuit.
6. more key combination hardware reset circuits according to claim 5, which is characterized in that the first switching element is
One PNP type triode, the emitter of the PNP type triode connect first button, and pass through the connection of the first divider resistance
Its base stage, the collector of the PNP type triode connect the RC charging circuits；The second switch element is a N-channel MOS
Pipe, the drain electrode of the N-channel MOS pipe connect the base stage of the PNP type triode, the N-channel MOS by the second divider resistance
The source electrode ground connection of pipe, grid connect second button.
7. more key combination hardware reset circuits according to any one of claim 1 to 6, which is characterized in that described
RC charging circuits include a resistance pressure-dividing network and at least one capacitance, and the resistance pressure-dividing network is connected to the switch electricity
Between road and ground, the divider node of the resistance pressure-dividing network connects the reset switch pipe by the capacity earth
Control terminal carries out break-make control to the reset switch pipe.
8. more key combination hardware reset circuits according to any one of claim 1 to 6, which is characterized in that described multiple
The control terminal of bit switch pipe connects the RC charging circuits, and one end of switch ways connects the system power supply, and connects electricity
The reset pin of master chip in sub- product, other end ground connection.
9. more key combination hardware reset circuits according to claim 8, which is characterized in that the reset switch Guan Weiyi
N-channel MOS pipe, the grid of the N-channel MOS pipe connect the RC charging circuits, source electrode ground connection, and drain electrode is connected by current-limiting resistance
The system power supply is connect, and connects the reset pin of master chip in electronic product.
10. a kind of electronic product, master chip, system power supply and charging circuit including runtime program；It is characterized in that, also
Including more key combination hardware reset circuits as claimed in any one of claims 1-9 wherein, the master chip receive it is described
During reset signal, control system Program reset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721553226.XU CN207382278U (en) | 2017-11-20 | 2017-11-20 | A kind of more key combination hardware reset circuits and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721553226.XU CN207382278U (en) | 2017-11-20 | 2017-11-20 | A kind of more key combination hardware reset circuits and electronic product |
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| Publication Number | Publication Date |
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| CN207382278U true CN207382278U (en) | 2018-05-18 |
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ID=62333437
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721553226.XU Active CN207382278U (en) | 2017-11-20 | 2017-11-20 | A kind of more key combination hardware reset circuits and electronic product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809229A (en) * | 2017-11-20 | 2018-03-16 | 歌尔科技有限公司 | A kind of more key combination hardware reset circuits and electronic product |
| CN114003117A (en) * | 2021-12-01 | 2022-02-01 | 深圳市创视微智能技术有限公司 | Terminal device powered by built-in battery and reset control method |
-
2017
- 2017-11-20 CN CN201721553226.XU patent/CN207382278U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809229A (en) * | 2017-11-20 | 2018-03-16 | 歌尔科技有限公司 | A kind of more key combination hardware reset circuits and electronic product |
| CN107809229B (en) * | 2017-11-20 | 2024-04-02 | 歌尔科技有限公司 | Multi-key combined hardware reset circuit and electronic product |
| CN114003117A (en) * | 2021-12-01 | 2022-02-01 | 深圳市创视微智能技术有限公司 | Terminal device powered by built-in battery and reset control method |
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