Key response circuit and electronic equipment

Abstract

The utility model relates to the technical field of circuits, and provides a key response circuit and electronic equipment, and the circuit comprises a main control module, a key module and a startup module. The main control module comprises a main control chip, and the main control chip is provided with a power management unit; the key module comprises a first branch circuit, a second branch circuit and a function key; the startup module comprises a switch unit and a trigger unit. The first end of the function key is connected with the key power supply and the general input and output pin of the main control chip through a first branch, and the second end of the function key is grounded. And the switch unit is respectively connected with the non-shielding interruption pin of the main control chip and the trigger unit, and is connected with the first end of the function key through a second branch. According to the key response circuit, rapid cold start of the key response circuit can be realized, the function key can be responded in time, and the user experience is improved. Meanwhile, a power supply signal is provided for the trigger unit, and the switch unit is triggered to be switched off, so that the influence on the function implementation of the subsequent function key is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a key response circuit and electronic equipment. Background Art

[0002] With the development of the times, users have higher and higher requirements for the functions of electronic devices. As the functions of electronic devices become more and more powerful, the complexity of the system will become more and more complex accordingly, and the cold start process of electronic devices will take longer to configure basic operating information, so the cold start time of electronic devices will also become longer and longer.

[0003] For example, for some electronic devices that often need to be powered off and shut down, such as dictionary pens and scanning pens, when users encounter information that needs to be searched and use the electronic device, they need to wait a long time for the power to start up, which has a certain impact on the continuity of learning and reduces the user experience. Utility Model Content

[0004] The utility model provides a key response circuit and an electronic device, which are used to solve the defect of long waiting time after the electronic device is turned on in the prior art.

[0005] The utility model provides a key response circuit, comprising: a main control module, a key module and a power-on module;

[0006] The main control module includes a main control chip, and the main control chip is configured with a power management unit;

[0007] The key module includes a first branch, a second branch and a function key;

[0008] The power-on module includes a switch unit and a trigger unit;

[0009] The first end of the function key is connected to the key power supply and the general input and output pin of the main control chip through the first branch, and the second end of the function key is grounded;

[0010] The switch unit is respectively connected to the non-shielded interrupt pin of the main control chip and the trigger unit, and is connected to the first end of the function key through the second branch;

[0011] The power management unit is used to be awakened when the non-shielding interrupt pin receives a low level signal, and provide a power signal to the trigger unit;

[0012] The trigger unit is connected to the power management unit and is used to trigger the switch unit to turn off when receiving the power signal.

[0013] According to a key response circuit provided by the utility model, the switch unit includes a field effect tube;

[0014] The drain of the field effect tube is connected to the non-shielding interrupt pin;

[0015] The source of the field effect tube is connected to the power supply, and is connected to the function key through the second branch;

[0016] The gate of the field effect tube is connected to the power supply and the trigger unit.

[0017] According to a key response circuit provided by the utility model, the switch unit further includes a first resistor, a second resistor and a third resistor;

[0018] The gate of the field effect tube is connected to the power supply through the first resistor and the second resistor, and is connected to the trigger unit through the first resistor;

[0019] The source of the field effect tube is connected to the power supply through the third resistor.

[0020] According to a key response circuit provided by the utility model, the trigger unit includes a triode;

[0021] The base of the transistor is connected to the power management unit;

[0022] The collector of the triode is connected to the switch unit;

[0023] The emitter of the transistor is grounded.

[0024] According to a key response circuit provided by the utility model, the trigger unit further includes a fourth resistor and a fifth resistor;

[0025] The base of the transistor is connected to the power management unit through the fourth resistor and is grounded through the fifth resistor.

[0026] According to a key response circuit provided by the utility model, the key module includes multiple types of function keys, and the first end of each type of function key is connected to the key power supply and a general input and output pin of the main control chip through the first branch;

[0027] The switch unit is connected to the first end of each type of the function key through one of the second branches.

[0028] According to a key response circuit provided by the utility model, the first branch includes a first type diode and a sixth resistor;

[0029] The second branch includes a second type of diode;

[0030] The anode of the first type diode is connected to the general input and output pin of the main control chip, and is connected to the key power supply through the sixth resistor;

[0031] The cathode of the first type of diode is connected to the function key;

[0032] The switch unit is connected to the anode of the second type diode, and the cathode of the second type diode is connected to the function key.

[0033] According to a key response circuit provided by the utility model, both the first-type diode and the second-type diode are Schottky diodes.

[0034] According to a key response circuit provided by the utility model, the main control module further includes a seventh resistor and an isolation capacitor;

[0035] The non-shielding interrupt pin is connected to the power supply through the seventh resistor;

[0036] The non-shielding interrupt pin is grounded through the isolation capacitor.

[0037] The utility model also provides an electronic device, comprising the key response circuit mentioned above.

[0038] The utility model provides a key response circuit and an electronic device, wherein the key response circuit comprises: a main control module, a key module and a power-on module; the main control module comprises a main control chip, and the main control chip is provided with a power management unit; the key module comprises a first branch, a second branch and a function key; and the power-on module comprises a switch unit and a trigger unit. The first end of the function key is connected to the key power supply and the general input and output pin of the main control chip respectively through the first branch, and the second end of the function key is grounded. The switch unit is connected to the non-shielded interrupt pin of the main control chip and the trigger unit respectively, and is connected to the first end of the function key through the second branch. In the key response circuit, when the function key is pressed, the low-level signal generated by the key module will be transmitted to the general input and output pin of the main control chip and the switch unit to synchronously wake up the power management unit and realize the corresponding function of the pressed function key. The key response circuit can be quickly cold-started, and the function key can be responded to in time to improve the user experience. At the same time, a power signal is provided to the trigger unit to trigger the switch unit to turn off, so as to prevent the conduction of the switch unit from affecting the function realization of the subsequent function keys. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on the drawings in the following description without creative work.

[0040] Figure 1 It is a structural schematic diagram of a key response circuit provided by the utility model;

[0041] Figure 2 It is a structural schematic diagram of a power-on module in a key response circuit provided by the utility model;

[0042] Figure 3 This is one of the structural schematic diagrams of the key module in the key response circuit provided by the utility model;

[0043] Figure 4 This is the second structural schematic diagram of the key module in the key response circuit provided by the utility model;

[0044] Figure 5 It is a structural schematic diagram of the main control module in the key response circuit provided by the utility model;

[0045] Figure 6 It is a structural schematic diagram of the electronic equipment provided by the utility model. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] The term "first" or "second" in the specification and claims of the utility model may include one or more of the features explicitly or implicitly. In the description of the utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0048] Since existing electronic devices need to wait a long time to start up, the user experience is reduced. Therefore, in order to solve this problem, the embodiment of the utility model provides a key response circuit, which can start up through function keys and quickly realize corresponding functions, thereby reducing the startup time of the electronic device and improving the user experience.

[0049] Figure 1 A key response circuit is provided in an embodiment of the utility model, and the key response circuit includes a main control module 1, a key module 2 and a power-on module 3.

[0050] The main control module 1 includes a main control chip U1 , and the main control chip U1 is configured with a power management unit (Power Management Circuit, PMC) 11 .

[0051] The key module 2 includes a first branch 21 , a second branch 22 and a function key 23 .

[0052] The power-on module 3 includes a switch unit 31 and a trigger unit 32 .

[0053] A first end of the function key 23 is connected to a key power source VCC_1 and a general-purpose input / output (GPIO) pin of the main control chip U1 through a first branch 21 , and a second end of the function key 23 is grounded.

[0054] The switch unit 31 is respectively connected to the non-maskable interrupt (NMI) pin of the main control chip U1 and the trigger unit 32 , and is connected to the first end of the function key 23 through the second branch 22 .

[0055] PMC11 is used to be awakened when the NMI pin receives a low level signal and provide a power signal to the trigger unit 32;

[0056] The trigger unit 32 is connected to the PMC11 and is used to trigger the switch unit 31 to turn off when receiving a power signal.

[0057] Specifically, in the key response circuit provided in the embodiment of the utility model, the main control chip U1 can not only realize the power management function through PMC11, but also integrate the interrupt wake-up function.

[0058] The key module 2 may include a first branch 21 , a second branch 22 and a function key 23 .

[0059] The first branch 21 may be a wire, or may be connected with a resistor or a unidirectional conductive element as required. Similarly, the second branch 22 may be a wire, or may be connected with a resistor or a unidirectional conductive element as required, which is not specifically limited here.

[0060] The function button 23 may include one or more function buttons, and each function button 23 may include one type of function button or multiple types of function buttons. Each type of function button 23 implements the same type of function. When the button module 2 includes multiple function buttons 23, the first branch 21 and the second branch 22 may also include multiple function buttons, and the function buttons 23 may be connected to the first branch 21 in a one-to-one correspondence, and connected to the second branch 22 in a one-to-one correspondence.

[0061] In addition, function keys 23 of the same type may be connected to a first branch 21 and a second branch 22 respectively according to the type of the function keys 23 .

[0062] The first end of the function button 23 is connected to the button power supply VCC_1 and the GPIO pin of the main control chip U1 through the first branch 21, and the second end of the function button 23 is grounded.

[0063] When the function key 23 is pressed, the key module 2 generates a power-on signal POWER_ON and a key signal GPIO_SIGNAL, and both the power-on signal POWER_ON and the key signal GPIO_SIGNAL are low-level signals.

[0064] The key signal GPIO_SIGNAL is transmitted to the GPIO pin of the main control chip U1 through the first branch 21 , and the main control chip U1 can identify the pressed function key 23 and implement the corresponding function.

[0065] The power-on module 3 includes a switch unit 31 and a trigger unit 32 . The switch unit 31 is connected to the NMI pin of the main control chip U1 and the trigger unit 32 respectively, and is connected to the first end of the function key 23 through the second branch 22 .

[0066] When the function key 23 is pressed, the power-on signal POWER_ON generated by the key module 2 is also transmitted to the power-on unit 31 in the power-on module 3 through the second branch 22. The power-on unit 31 is in the on state, and transmits the power-on signal POWER_ON to the NMI pin of the main control chip U1. At this time, the output signal of the power-on unit 31 is also a low-level signal. It can be understood that the switch unit 31 is in the on state when the key response circuit is not working or starts working.

[0067] When the NMI pin of the main control chip U1 receives the output signal of the power-on unit 31, the main control chip U1 wakes up the PMC11, and the PMC11 generates a power signal DCDC1. This belongs to the conventional control logic inside the main control chip U1. In the embodiment of the utility model, the PMC11 is connected to the trigger unit 32, and the PMC11 is used to provide the power signal DCDC1 to the trigger unit 32.

[0068] The trigger unit 32 triggers the switch unit 31 to turn off when receiving the power signal DCDC1. At this point, the key response circuit enters a normal working state. Thereafter, when the key response circuit works normally, the switch unit 31 is in the off state.

[0069] The key response circuit provided in the embodiment of the utility model includes: a main control module, a key module and a power-on module; the main control module includes a main control chip, and the main control chip is configured with a power management unit; the key module includes a first branch, a second branch and a function key; the power-on module includes a switch unit and a trigger unit. The first end of the function key is connected to the key power supply and the general input and output pin of the main control chip respectively through the first branch, and the second end of the function key is grounded. The switch unit is respectively connected to the non-shielded interrupt pin of the main control chip and the trigger unit, and is connected to the first end of the function key through the second branch. In the key response circuit, when the function key is pressed, the low-level signal generated by the key module will be transmitted to the general input and output pin of the main control chip and the switch unit to synchronously wake up the power management unit and realize the corresponding function of the pressed function key. The key response circuit can be quickly cold-started, and the function key can be responded to in time to improve the user experience. At the same time, a power signal is provided to the trigger unit to trigger the switch unit to turn off, so as to prevent the conduction of the switch unit from affecting the function realization of the subsequent function keys.

[0070] Based on the above embodiments, Figure 2 As shown, the switch unit 31 includes a field effect transistor Q1. The field effect transistor Q1 may be an N-channel field effect transistor, and its model may be 2N7002.

[0071] The drain D of the field effect transistor Q1 is connected to the NMI pin of the main control chip U1.

[0072] The source S of the field effect transistor Q1 is connected to the power supply VCC-RTC, and is connected to the function button 23 through the second branch 22 .

[0073] The gate G of the field effect transistor Q1 is connected to the power supply VCC-RTC and the trigger unit 32 .

[0074] Specifically, the input of the source S of the field effect transistor Q1 includes the power-on signal POWER_ON transmitted through the second branch 22 and the first power supply signal provided by the power supply VCC-RTC. The input of the gate G of the field effect transistor Q1 includes the second power supply signal provided by the power supply VCC-RTC and the pull-down signal provided by the trigger unit 32.

[0075] When the function key 23 is not pressed, the source S and the gate G of the field effect transistor Q1 are respectively pulled up to the power supply VCC-RTC, and the field effect transistor Q1 is in the off state.

[0076] When the function key 23 is pressed, the source S of the field effect transistor Q1 becomes a low level, and the field effect transistor Q1 is turned on.

[0077] The output signal AP-NMI of the drain D of the field effect transistor Q1 is a low level signal corresponding to the power-on signal POWER_ON when the field effect transistor Q1 is turned on.

[0078] After receiving the output signal AP-NMI of the drain D of the field effect transistor Q1 , the NMI pin of the main control chip U1 wakes up the PMC11 to enter normal operation, and the PMC11 sends a power signal DCDC1 to the trigger unit 32 .

[0079] When receiving the power signal DCDC1, the trigger unit 32 can transmit a pull-down signal to the gate G of the field effect transistor Q1, pull down the level of the gate G of the field effect transistor Q1, trigger the field effect transistor Q1 to turn off, and the NMI pin of the main control chip U1 returns to a high level. Therefore, the low-level signal received by the NMI pin of the main control chip U1 is a low-level pulse signal.

[0080] In the embodiment of the utility model, the function of the switch unit is realized by a field effect tube, so that the structure of the switch unit can be simpler and more stable.

[0081] Based on the above embodiments, Figure 2 As shown, the switch unit 31 further includes a first resistor R1, a second resistor R2 and a third resistor R3.

[0082] The gate G of the field effect transistor Q1 is connected to the power supply VCC-RTC through the first resistor R1 and the second resistor R2, and is connected to the trigger unit 32 through the first resistor R1.

[0083] The source S of the field effect transistor Q1 is connected to the power supply VCC-RTC via the third resistor R3.

[0084] The power supply VCC-RTC is a first power supply signal provided by the source S of the field effect transistor Q1 and obtained by voltage division through the third resistor R3.

[0085] The second power supply signal provided by the power supply VCC-RTC to the gate G of the field effect transistor Q1 is obtained by voltage division through the first resistor R1 and the second resistor R2.

[0086] The pull-down signal provided by the trigger unit 32 to the gate G of the field effect transistor Q1 is obtained by voltage division through the first resistor R1.

[0087] In an embodiment of the utility model, a first resistor and a second resistor are introduced between the gate of the field effect tube and the power supply, a first resistor is introduced between the gate of the field effect tube and the trigger unit, and a third resistor is introduced between the source of the field effect tube and the power supply, so as to realize voltage division and achieve the effect of protecting the field effect tube.

[0088] Based on the above embodiments, Figure 2 As shown, the trigger unit 32 includes a transistor Q2. The base b of the transistor Q2 is connected to the PMC11. After being awakened, the PMC11 provides a power signal DCDC1 to the base b of the transistor Q2.

[0089] The collector c of the transistor Q2 is connected to the switch unit 31 , specifically connected to the first resistor R1 in the switch unit 31 .

[0090] The emitter c of transistor Q2 is grounded.

[0091] The base b of the transistor Q2 is turned on after receiving the power signal DCDC1 , and then provides a pull-down signal to the field effect transistor Q1 in the switch unit 31 through the first resistor R1 in the switch unit 31 .

[0092] In the embodiment of the utility model, the function of the trigger unit is realized by a triode, so that the structure of the trigger unit can be simpler and more stable.

[0093] Based on the above embodiments, Figure 2 As shown, the trigger unit 32 further includes a fourth resistor R4 and a fifth resistor R5.

[0094] The base b of the transistor Q2 is connected to the PMC11 through the fourth resistor R4 and is grounded through the fifth resistor R5. In this way, the transistor Q2 can be protected and its function can be realized through the fourth resistor R4 and the fifth resistor R5.

[0095] Based on the above embodiment, the key module 2 includes multiple types of function keys 23, and the first end of each type of function key 23 is connected to the key power supply VCC_1 and a GPIO pin of the main control chip U1 through a first branch 21. Here, the voltage of the key power supply VCC_1 can be 3.3V.

[0096] The switch unit 31 is connected to the first end of each type of function button 23 via a second branch 22 .

[0097] like Figure 3As shown, the first function key SW1 and the second function key SW2 are function keys of the same type, which can realize the same function and are logically "OR" logic. The first function key SW1 and the second function key SW2 provide the first key signal GPIO_SIGNAL1 to the GPIO pin of the main control chip U1 through a second branch 21, and are connected to the switch unit 31 through a second branch 22 to provide the switch unit 31 with a power-on signal POWER_ON.

[0098] like Figure 4 As shown, the third function key SW3 is another type of function key, which can realize functions different from those of the first function key SW1 and the second function key SW2.

[0099] The third function button SW3 provides a second button signal GPIO_SIGNAL2 to the GPIO pin of the main control chip U1 through another second branch 21 , and is connected to the switch unit 31 through another second branch 22 to provide a power-on signal POWER_ON to the switch unit 31 .

[0100] On the basis of the above embodiment, the first branch 21 includes a first-type diode and a sixth resistor, and the second branch 22 includes a second-type diode.

[0101] The anode of the first type diode is connected to the GPIO pin of the main control chip U1, and is connected to the key power supply VCC_1 through the sixth resistor.

[0102] The cathode of the first type diode is connected to the function button 23 .

[0103] The switch unit 31 is connected to the anode of the second type diode, and the cathode of the second type diode is connected to the function key 23 .

[0104] Specifically, Figure 3 and Figure 4 As shown, the first diode D1 and the third diode D3 are both first-type diodes, the second diode D2 and the fourth diode D4 are both second-type diodes, and the resistor R6 and the resistor R7 are both sixth resistors.

[0105] In the embodiment of the utility model, the unidirectional conductivity of the diode is utilized to ensure that a low-level signal is output through the key module when a function key is pressed.

[0106] On the basis of the above embodiment, the first end of the function button 23 is grounded through an isolation circuit to achieve isolation.

[0107] like Figure 3As shown, the isolation circuit may include a diode D5, a diode D6, and capacitors C1 and C2 connected in parallel, and the anodes of the diodes D5 and D6 are grounded, and the cathodes of the diodes D5 and D6 are connected to the first end of the function key 23.

[0108] like Figure 4 As shown, the isolation circuit may further include a capacitor C3.

[0109] On the basis of the above embodiments, the first type of diode and the second type of diode are both Schottky diodes, which can ensure good performance of the first branch and the second branch.

[0110] Based on the above embodiments, Figure 5 As shown, the main control module 1 further includes a seventh resistor R8 and an isolation capacitor C4.

[0111] The NMI pin of the main control chip U1 is connected to the power supply VCC-RTC through the seventh resistor R8 and is grounded through the isolation capacitor C4.

[0112] In addition, the reset (RESET) pin of the main control chip U1 is connected to the power supply VCC-RTC through the resistor R9 and is grounded through the isolation capacitor C5.

[0113] The power switch (PWR_ON) pin of the PMC is connected to the power supply VCC-RTC through the resistor R10 and is grounded through the isolation capacitor C6.

[0114] Based on the above embodiments, Figure 6 As shown, an electronic device is also provided in an embodiment of the utility model. The electronic device includes the key response circuit 61 provided in the above embodiments.

[0115] The electronic device may include intelligent learning devices such as a scanning pen and a dictionary pen, and may also include other miniaturized electronic devices with function keys.

[0116] Since a key response circuit is configured in the electronic device, when a function key of the electronic device is pressed, the low-level signal generated by the key module will be transmitted to the general input and output pins of the main control chip and the switch unit to synchronously wake up the power management unit and realize the corresponding function of the pressed function key. The electronic device can be quickly cold-started, and the function key can be responded to in a timely manner to improve the user experience. At the same time, a power signal is provided to the trigger unit to trigger the switch unit to turn off, so as to prevent the conduction of the switch unit from affecting the function realization of subsequent function keys.

[0117] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A key response circuit, characterized in that: include: Main control module, button module and power-on module; The main control module includes a main control chip, and the main control chip is configured with a power management unit; The key module includes a first branch, a second branch and a function key; The power-on module includes a switch unit and a trigger unit; The first end of the function key is connected to the key power supply and the general input and output pin of the main control chip through the first branch, and the second end of the function key is grounded; The switch unit is respectively connected to the non-shielded interrupt pin of the main control chip and the trigger unit, and is connected to the first end of the function key through the second branch; The power management unit is used to be awakened when the non-shielding interrupt pin receives a low level signal, and provide a power signal to the trigger unit; The trigger unit is connected to the power management unit and is used to trigger the switch unit to turn off when receiving the power signal.

2. The key response circuit according to claim 1, characterized in that: The switch unit includes a field effect tube; The drain of the field effect tube is connected to the non-shielding interrupt pin; The source of the field effect tube is connected to the power supply, and is connected to the function key through the second branch; The gate of the field effect tube is connected to the power supply and the trigger unit.

3. The key response circuit according to claim 2, characterized in that: The switch unit further includes a first resistor, a second resistor and a third resistor; The gate of the field effect tube is connected to the power supply through the first resistor and the second resistor, and is connected to the trigger unit through the first resistor; The source of the field effect tube is connected to the power supply through the third resistor.

4. The key response circuit according to claim 1, characterized in that: The trigger unit includes a triode; The base of the transistor is connected to the power management unit; The collector of the triode is connected to the switch unit; The emitter of the transistor is grounded.

5. The key response circuit according to claim 4, characterized in that: The trigger unit further includes a fourth resistor and a fifth resistor; The base of the transistor is connected to the power management unit through the fourth resistor and is grounded through the fifth resistor.

6. The key response circuit according to claim 1, characterized in that: The key module includes multiple types of function keys, and the first end of each type of function key is connected to the key power supply and a general input / output pin of the main control chip through one of the first branches; The switch unit is connected to the first end of each type of the function key through one of the second branches.

7. The key response circuit according to any one of claims 1 to 6, characterized in that: The first branch includes a first type diode and a sixth resistor; The second branch includes a second type of diode; The anode of the first type diode is connected to the general input / output pin of the main control chip, and is connected to the key power supply through the sixth resistor; The cathode of the first type of diode is connected to the function key; The switch unit is connected to the anode of the second type diode, and the cathode of the second type diode is connected to the function key.

8. The key response circuit according to claim 7, characterized in that: The first type of diode and the second type of diode are both Schottky diodes.

9. The key response circuit according to any one of claims 1 to 6, characterized in that: The main control module also includes a seventh resistor and an isolation capacitor; The non-shielding interrupt pin is connected to the power supply through the seventh resistor; The non-shielding interrupt pin is grounded through the isolation capacitor.

10. An electronic device, characterized in that: include: A key response circuit as claimed in any one of claims 1 to 9.

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