CN104216493A - Reset circuit of MCU chip - Google Patents
Reset circuit of MCU chip Download PDFInfo
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- CN104216493A CN104216493A CN201310221878.3A CN201310221878A CN104216493A CN 104216493 A CN104216493 A CN 104216493A CN 201310221878 A CN201310221878 A CN 201310221878A CN 104216493 A CN104216493 A CN 104216493A
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- power supply
- module
- described power
- reset circuit
- storage capacitor
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Abstract
The invention discloses a reset circuit of an MCU chip. The reset circuit is connected between a power supply and an MCU power supply conversionmanagement module; an anode of the power supply is in coupling connection with an input end of the power supply conversion management module, and a cathodeof the power supply is in coupling connection with an earthing end of the power supply conversion management module; the reset circuit of the MCU chip comprises a reset module, wherein the reset module comprises a regulating resistorwhich regulates charge and discharge time of an energy-storage capacitor; one end of the regulating resistor is connected with an IN end of an input coupling end of the power supply conversion management module, and the other end of the regulating resistor is connected with one end of the energy-storage capacitor; the other end of the energy-storage capacitor is in coupling connection with the cathodeof the power supply; a connection node between the regulating resistor and the energy-storage capacitor is connected with an enabling end of the power supply conversion management module. By the aid of the reset circuit of the MCU chip, the MCU chip can reset reliably, and the cost is low.
Description
Technical field
The present invention relates to MCU(micro-control unit) field, particularly relate to a kind of MCU chip reset circuit.
Background technology
MCU reset namely be make all registers of MCU inside and I/O(I/O) mouth all return to initial setting up state one operation.If MCU can not reset completely, just there will be part MCU internal register and return to original state, other parts MCU register then maintains the state before reset, or I/O also maintains original state, does not namely reach reset mode completely.MCU can not reset can cause MCU not work normally completely, makes control panel or ballast resistor cannot realize required function, thus the function of influential system entirety and performance.Therefore, MCU reliable reset is made to be necessary.Can be divided into according to the mode that MCU resets: electrification reset, low voltage test reset, house dog (watchdog) resets and software reset.Wherein, for electrification reset, when MCU does not power, when MCU power supply voltage rises to the operational voltage value of certain MCU by 0 volt and maintains certain hour, MCU resets automatically, even if under the state of all registers of MCU and I/O mouth maintains default (default) pattern.Now commercially have some special MCU reseting modules, i.e. special electrification reset chip, although its reliability is high, its price is also corresponding higher, increases the cost of product widely, is unfavorable for product competition commercially itself.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of MCU chip reset circuit, can realize MCU chip reliable reset, and cost is low.
For solving the problems of the technologies described above, MCU chip reset circuit of the present invention, the Power convert being connected to power supply and MCU manages between module, to reset to described MCU; Wherein, the input end that the positive pole of described power supply and described Power convert manage module is of coupled connections, and the earth terminal that the negative pole of described power supply and described Power convert manage module is of coupled connections, and powers to described MCU in order to realize described power supply; Described MCU chip reset circuit, comprising: a reseting module, and this reseting module comprises the regulating resistance of an adjustment storage capacitor charging and discharging time; The input coupled end IN that one end and the described Power convert of described regulating resistance manage module holds and is connected, and the other end of described regulating resistance is connected with one end of described storage capacitor, and the other end of described storage capacitor is connected with the negative couplings of described power supply; The Enable Pin that connected node between described regulating resistance with described storage capacitor manages module with described Power convert is connected.
The present invention has following beneficial effect: by the resistance of regulating resistance in arrangement reset module and the capacitance of storage capacitor, ensure within the scope that the ascending velocity of the supply voltage of the MCU when MCU powers on and time specify in MCU reset feature, thus ensure that MCU completely reliably resets when powering on.In the process of MCU electrification reset, do not need extra electrification reset chip, only need to increase MCU resetting means between original MCU and power supply, therefore, circuit structure is simple, be easy to realization and cost is low.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation:
Fig. 1 is described MCU chip reset circuit one embodiment circuit diagram;
Fig. 2 is the logic diagram applying described MCU chip reset circuit.
Embodiment
Shown in composition graphs 2, described MCU chip reset circuit, the Power convert being connected to power supply and MCU manages between module, to reset to described MCU.Wherein, the input end that the positive pole of described power supply and described Power convert manage module is of coupled connections, and the earth terminal that the negative pole of described power supply and described Power convert manage module is of coupled connections, and powers to described MCU in order to realize described power supply.Described Power convert management module is connected with main control module.
Shown in composition graphs 1, described MCU chip reset circuit, comprises a reseting module.This reseting module comprises the regulating resistance R1 of an adjustment storage capacitor charging and discharging time; The input coupled end IN that one end and the described Power convert of described regulating resistance R1 manage module holds and is connected, the other end of described regulating resistance R1 is connected with one end of described storage capacitor C1, and the other end of described storage capacitor C1 and the negative pole (i.e. GND) of described power supply are of coupled connections; The Enable Pin EN that connected node between described regulating resistance R1 with described storage capacitor C1 and described Power convert manage module is connected.
In the above-described embodiments, the described Power convert management input coupled end IN of module and the positive pole K1 of described power supply is also connected with the protection module of the input current for regulating described power supply between holding.Described protection module comprises an a protective resistance R2 and diode D1; One end of protective resistance R2 is held with the positive pole K1 of described power supply and is connected, and the other end is connected with the positive pole of described diode D1, and the input coupled end IN that negative pole and the described Power convert of described diode D1 manage module is connected.
The negative pole K2 of described power supply holds the earth terminal GND managing module with described Power convert to be of coupled connections.
In Fig. 1, K3, K4 are the output of MCU.
In the above-described embodiments, described regulating resistance is adjustable resistance.
Although the present invention utilizes specific embodiment to be described, the explanation of embodiment is not limit the scope of the invention.One skilled in the art is by reference to explanation of the present invention, and when not deviating from the spirit and scope of the present invention, easily carry out various amendment or can combine embodiment, these belong to protection scope of the present invention equally.
Claims (3)
1. a micro-control unit MCU chip reset circuit, is characterized in that, the Power convert that this reset circuit is connected to power supply and micro-control unit MCU manages between module, to reset to described micro-control unit MCU; Wherein, the input end that the positive pole of described power supply and described Power convert manage module is of coupled connections, and the earth terminal that the negative pole of described power supply and described Power convert manage module is of coupled connections, and powers to described micro-control unit MCU in order to realize described power supply; Described micro-control unit MCU chip reset circuit, comprising: a reseting module, and this reseting module comprises the regulating resistance of an adjustment storage capacitor charging and discharging time; The input coupled end IN that one end and the described Power convert of described regulating resistance manage module holds and is connected, and the other end of described regulating resistance is connected with one end of described storage capacitor, and the other end of described storage capacitor is connected with the negative couplings of described power supply; The Enable Pin that connected node between described regulating resistance with described storage capacitor manages module with described Power convert is connected.
2. reset circuit as claimed in claim 1, is characterized in that: the protection module being also connected with the input current for regulating described power supply between the input coupled end of described Power convert management module and the positive terminal of described power supply; Described protection module comprises a protective resistance and a diode; One end of protective resistance is connected with the positive terminal of described power supply, and the other end is connected with the positive pole of described diode, and the input coupled end that negative pole and the described Power convert of described diode manage module is connected.
3. reset circuit as claimed in claim 1 or 2, is characterized in that: described regulating resistance is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310221878.3A CN104216493A (en) | 2013-06-05 | 2013-06-05 | Reset circuit of MCU chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310221878.3A CN104216493A (en) | 2013-06-05 | 2013-06-05 | Reset circuit of MCU chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104216493A true CN104216493A (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310221878.3A Pending CN104216493A (en) | 2013-06-05 | 2013-06-05 | Reset circuit of MCU chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113132119A (en) * | 2021-03-08 | 2021-07-16 | 东风电驱动系统有限公司 | Circuit and method for rapidly starting and responding network of CAN network node equipment |
| CN114816016A (en) * | 2022-04-22 | 2022-07-29 | 电子科技大学 | Configurable reset system based on register file |
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| CN200959589Y (en) * | 2006-09-29 | 2007-10-10 | 上海海尔集成电路有限公司 | 8-bit RISC micro-controller frame |
| CN101216788A (en) * | 2008-01-21 | 2008-07-09 | 珠海中慧微电子有限公司 | Reset control chip and method |
| US20090106609A1 (en) * | 2007-10-18 | 2009-04-23 | Fujitsu Microelectronics Limited | Semiconductor integrated circuit and debug mode determination method |
| CN201725187U (en) * | 2010-05-14 | 2011-01-26 | 深圳市中奥吉达电梯有限公司 | Automatic control system of microcomputer |
| CN202472546U (en) * | 2012-03-06 | 2012-10-03 | 深圳世强电讯有限公司 | MCU (Microprogrammed Control Unit) resetting device |
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2013
- 2013-06-05 CN CN201310221878.3A patent/CN104216493A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200959589Y (en) * | 2006-09-29 | 2007-10-10 | 上海海尔集成电路有限公司 | 8-bit RISC micro-controller frame |
| US20090106609A1 (en) * | 2007-10-18 | 2009-04-23 | Fujitsu Microelectronics Limited | Semiconductor integrated circuit and debug mode determination method |
| CN101216788A (en) * | 2008-01-21 | 2008-07-09 | 珠海中慧微电子有限公司 | Reset control chip and method |
| CN201725187U (en) * | 2010-05-14 | 2011-01-26 | 深圳市中奥吉达电梯有限公司 | Automatic control system of microcomputer |
| CN202472546U (en) * | 2012-03-06 | 2012-10-03 | 深圳世强电讯有限公司 | MCU (Microprogrammed Control Unit) resetting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113132119A (en) * | 2021-03-08 | 2021-07-16 | 东风电驱动系统有限公司 | Circuit and method for rapidly starting and responding network of CAN network node equipment |
| CN114816016A (en) * | 2022-04-22 | 2022-07-29 | 电子科技大学 | Configurable reset system based on register file |
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Application publication date: 20141217 |