CN106528237B - MCU start-up mode selection circuit and MCU code update method based on the circuit - Google Patents
MCU start-up mode selection circuit and MCU code update method based on the circuit Download PDFInfo
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- CN106528237B CN106528237B CN201610994464.8A CN201610994464A CN106528237B CN 106528237 B CN106528237 B CN 106528237B CN 201610994464 A CN201610994464 A CN 201610994464A CN 106528237 B CN106528237 B CN 106528237B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44568—Immediately runnable code
- G06F9/44578—Preparing or optimising for loading
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44505—Configuring for program initiating, e.g. using registry, configuration files
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Abstract
The invention discloses MCU start-up mode selection circuit and the MCU code update method based on the circuit.The circuit includes power supply, single knife switch, pull-up resistor and the first pull down resistor, further includes capacitor, diode and the second pull down resistor.One end of first pull down resistor is connected with one end of single knife switch, the other end ground connection of the first pull down resistor；The other end of single knife switch is connected with one end of pull-up resistor；Another termination power of pull-up resistor；One end of second pull down resistor is grounded；The other end of second pull down resistor is connected with the anode of diode and MCU universal input output pin.One end of capacitor is grounded；The other end of capacitor is connected with the cathode of diode, the other end of single knife switch, one end of pull-up resistor and MCU start-up mode selection pin.The circuit can complete MCU code update without changer and toggle switch, the time also shorten to be only code burning time, allow MCU code update to become simple and easy to operate.
Description
Present patent application be the applying date be on October 18th, 2013, application No. is 201310493084.2, it is entitled
The division Shen of the Chinese invention patent application of " MCU start-up mode selection circuit and the MCU code update method based on the circuit "
Please.
Technical field
The present invention relates to the start-up mode fields micro-control unit (Micro Control Unit, MCU), and in particular to MCU
Start-up mode selection circuit and MCU code update method based on the circuit.
Background technique
The start-up mode of MCU is divided into normal mode of operation and burning mode, burning and more of the burning mode for MCU code
Newly.MCU can detect the current potential of start-up mode selection pin to determine which kind of mode entered when starting.If detecting start-up mode choosing
Selecting pin is low potential, then MCU enters normal mode of operation, if detecting start-up mode selection pin is high potential, MCU into
Enter burning mode.So needing to select one potential value of pin to MCU start-up mode before MCU starting.
Start-up mode selection circuit in the prior art is by a single knife switch, a pull-up resistor and a drop-down electricity
The circuit of composition is hindered to configure the potential value of MCU start-up mode selection pin.Under existing start-up mode selection circuit, every time
It requires to shut down when MCU more fresh code, dismantles complete machine and be then turned off switch to configure the high potential of MCU start-up mode selection pin
To enter burning mode, the burning and update of MCU code are carried out.After the completion of MCU more fresh code, need to restore switch for closure
State, is then assembled into complete machine, and configuration MCU start-up mode selects the low potential of pin to enter normal mode of operation.
This mode has a following defect: first, continually changer, be easy to cause the dismounting of MCU complete machine to wear；Second,
Need the dismounting technology of profession that could complete the dismounting work of MCU；The time of third, MCU code update is tediously long, the code of MCU
The time of update not only includes code recordable time, the time also spent comprising changer.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State the MCU start-up mode selection circuit of problem and the MCU code update method based on the circuit.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows: according to an aspect of the present invention, providing
A kind of MCU start-up mode selection circuit, the circuit include: power supply, single knife switch, pull-up resistor and the first pull down resistor composition
Circuit；Further, circuit further include: capacitor, diode and the second pull down resistor.
One end of first pull down resistor is connected with one end of single knife switch, the other end ground connection of the first pull down resistor.
The other end of single knife switch is connected with one end of pull-up resistor；Another termination power of pull-up resistor.
One end of second pull down resistor is grounded；The other end of second pull down resistor and the anode of diode and MCU it is logical
It is connected with input and output pin.
One end of capacitor is grounded, the other end, the pull-up electricity of the other end of capacitor and the cathode of diode and single knife switch
One end of resistance and the start-up mode selection pin of MCU are connected.
In this circuit provided by the invention, in the case where power supply is certain, the ginseng of pull-up resistor and the first pull down resistor
Number selection meets: pull-up resistor and the output voltage of single knife switch junction are no more than preset low potential value after partial pressure.
In this circuit provided by the invention, capacitor and the first pull down resistor composition delay resistance-capacitance circuit, capacitor and the
The parameter selection of one pull down resistor meets: the current potential delay for the resistance-capacitance circuit that is delayed is greater than MCU detecting MCU start-up mode and selects pin
The time of current potential.
According to another aspect of the present invention, a kind of one kind based on the aforementioned present invention one aspect circuit is provided
The method of MCU code update, this method comprises:
High potential is exported by the universal input output pin of MCU, the start-up mode of diode current flow, MCU selects pin
Become high potential and keeps certain time under the action of the delay resistance-capacitance circuit that capacitor and the first pull down resistor form.
MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for high potential, into burning mode, more fresh code.
The charge of capacitor storage is discharged by the first pull down resistor, and MCU start-up mode selects the high potential of pin to pass through the
One pull down resistor and pull-up resistor are divided into low potential.
After the completion of code update, MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for low potential, into normal
Operating mode.
This MCU start-up mode selection circuit of the invention, realizes MCU in the case where not dismounting complete machine and toggle switch
Burning mode is switched to by normal mode of operation, completes the burning of MCU code.The circuit can be such that MCU avoids caused by changer
Dismounting abrasion, does not need the dismounting technology of profession, while shortening the time of MCU code burning, and MCU code burning is allowed to become letter
Easy operation.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of MCU start-up mode selection circuit provided by one embodiment of the present invention；
Fig. 2 is a kind of process of MCU code update method provided by one embodiment of the present invention based on circuit shown in Fig. 1
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Core of the invention thought is that the universal input of the delay circuit and MCU that are formed using pull down resistor and capacitor is defeated
The automatic control of pin (General Purpose Input Output, GPIO) Lai Shixian start-up mode selection pin current potential and guarantor out
It holds, so in the normal mode of operation, start-up mode is controlled by MCU and selects the current potential of pin for high potential, to switch
To burning mode, after the completion of code update, the high potential of start-up mode selection pin passes through electric discharge again, partial pressure is restored to low electricity
Position, MCU enter normal mode of operation.
Fig. 1 is a kind of circuit diagram of MCU start-up mode selection circuit provided by one embodiment of the present invention.Of the invention this
Kind MCU start-up mode selection circuit includes: power supply, single knife switch, pull-up resistor and the first pull down resistor；The circuit further wraps
It includes: capacitor, diode and the second pull down resistor.
One end of first pull down resistor is connected with one end of single knife switch, the other end ground connection of the first pull down resistor.Hilted broadsword
The other end of switch is connected with one end of pull-up resistor.Another termination power of pull-up resistor, a termination of the second pull down resistor
Ground, the other end of the second pull down resistor are connected with the universal input output pin of the anode of diode and MCU.
One end of capacitor is grounded, the other end, the pull-up electricity of the other end of capacitor and the cathode of diode and single knife switch
One end of resistance and the start-up mode selection pin of MCU are connected.
Referring to Fig. 1, the MCU start-up mode selection circuit of the present embodiment include power supply, single knife switch J1, pull-up resistor R1 and
First pull down resistor R2；Further comprise: capacitor C1, diode D1 and the second pull down resistor R3.
Referring to Fig. 1, one end of the first pull down resistor R2 is connected with one end of single knife switch J1, and the first pull down resistor R2's is another
One end ground connection.
Referring to Fig. 1, the other end of single knife switch J1 is connected with one end of pull-up resistor R1.Another termination of pull-up resistor R1
Power supply.
Referring to Fig. 1, one end of the second pull down resistor R3 is grounded, and the other end and diode D1 of the second pull down resistor R3 is just
The universal input output pin (MCU_GPIO) of pole and MCU are connected.
Referring to Fig. 1, one end of capacitor C1 is grounded, the other end of capacitor C1 and the cathode of diode D1 and single knife switch J1
The other end, pull-up resistor R1 one end and MCU start-up mode selection pin (MCU_BOOT_MODE) be connected.
In the case where power supply is certain, the parameter selection of pull-up resistor R1 and the first pull down resistor R2 meet: on after partial pressure
Pull-up resistor R1 and the output voltage of the junction single knife switch J1 are no more than preset low potential value.
In one embodiment of the invention, power supply is 3.3 volts, in order to guarantee that pull-up resistor R1 is connected with single knife switch J1
The voltage exported after the partial pressure at place is no more than 0.3 volt of preset low potential value, the ginseng of pull-up resistor R1 and the first pull down resistor R2
Number selects to meet the ratio between pull-up resistor R1 and the first pull down resistor R2 resistance value as 10/1 condition.
Specifically, pull-up resistor R1 is 220 kilo-ohms, and the first pull down resistor R2 is 22 kilo-ohms, is in this way 3.3 volts in power supply
In the case of, it is 0.3 volt of low potential by the voltage exported after pull-up resistor R1 and the first pull down resistor R2 partial pressure.
Certainly in other embodiments of the invention, power supply can choose other parameters, be not limited to a reality of the invention
3.3 volts in example are applied, the value of low potential can also carry out pre- according to the relevant parameter of specific MCU start-up mode selection circuit
If 0.3 volt of low potential being not limited in one embodiment of the invention.
The parameter selection satisfaction of capacitor and the first pull down resistor composition delay resistance-capacitance circuit, capacitor and the first pull down resistor is prolonged
When resistance-capacitance circuit current potential delay be greater than MCU detecting MCU start-up mode selection pin current potential time.
In one embodiment of the invention, capacitor C1 and the first pull down resistor R2 composition delay resistance-capacitance circuit, capacitor C1
Meet with the parameter selection of the first pull down resistor R2: the current potential delay for the resistance-capacitance circuit that is delayed is greater than MCU detecting MCU start-up mode choosing
Select the time of pin current potential.Specifically, the first pull down resistor R2 is 22 kilo-ohms, capacitor C1 is 47 microfarads, preset MCU detecting
The time of MCU_BOOT_MODE pin current potential is 1 second, can obtain delay time greater than 1 second according to delay time calculation formula in this way.
It is appreciated that in other embodiments of the invention, MCU detects the time of MCU_BOOT_MODE pin current potential not
It is limited to 1 second, the selection of capacitor value should be carried out according to the relevant parameter in actual circuit to form rc-delay circuit.
In one embodiment of the invention, diode D1 is unilateal conduction, and electric current can only be flowed to from MCU_GPIO
MCU_BOOT_MODE。
In one embodiment of the invention, power supply is 3.3 volts, and 3.3 volts are high potentials.The resistance value of second pull down resistor R3
It is 10 kilo-ohms.
In one embodiment of the invention, diode D1 uses the diode of RB161M-20 model.
The burning of MCU code is divided into two kinds of situations, for the first time burning and second and later code update under the circuit.Specifically
Process is described below:
MCU burning code for the first time
Burning code is before assembly to MCU for the first time, that is to say, that when mainboard that code burning is good, then group again
Dress up complete machine.MCU for the first time burning code when, there is no data in MCU chip, space state be presented, MCU start-up mode can not be enabled
Select the automatic control and holding of pin current potential.Referring to Fig. 1, the process of MCU burning code for the first time are as follows: first shut down, be then turned off hilted broadsword
Switch J1, configuration start-up mode select the voltage of pin MCU_BOOT_MODE for high potential, are switched on, and power supply is electric by 3.3 volts of height
Flat to be transported to MCU_BOOT_MODE by pull-up resistor R1, MCU detects the high potential of MCU_BOOT_MODE hence into burning
Record mode carries out code burning.After the completion of code burning, shuts down and is closed single knife switch J1, be switched on after single knife switch J1 closure,
It is divided by pull-up resistor R1 and the first pull down resistor R2, by 3.3 volts of high voltage, is divided into 0.3 volt of low-voltage output and arrives
MCU_BOOT_MODE.MCU detects the low potential of MCU_BOOT_MODE hence into normal mode of operation.Through the above steps
Complete the code burning for the first time of MCU.
MCU second and later more fresh code
This MCU start-up mode selection circuit provided by the invention is primarily adapted for use in MCU second and later more fresh code
The case where.Referring to Fig. 1, the capacitor C1 in the circuit is used to store the charge inputted by MCU_GPIO.Second pull down resistor R3
Effect be to provide default electrical potential for MCU_GPIO, prevent vacant state.The effect of diode D1 is to utilize diode
Unilateal conduction characteristic prevent MCU_BOOT_ so that the charge of MCU_BOOT_MODE is bled off by the first pull down resistor R2
The Charge back flow of MODE and bleed off by the way that the second pull down resistor R3 is too fast.
Capacitor C1 and the first pull down resistor R2 composition delay resistance-capacitance circuit.In order to guarantee that MCU can be detected when restarting
Start-up mode selects the high potential of pin, so that MCU enters burning mode, delay resistance in one embodiment of the invention
The delay time of capacitive circuit needs to be greater than 1 second.
MCU second and the later process of more fresh code specifically:
Referring to Fig. 1, when MCU needs more fresh code, in the normal mode of operation, MCU exports high potential by MCU_GPIO
(3.3 volts), diode D1 conducting, MCU_BOOT_MODE becomes high potential, due to the electric charge store function of capacitor C1, MCU_
BOOT_MODE can keep high potential (3.3 volts) regular hour, and then MCU is restarted, and the current potential for detecting MCU_BOOT_MODE is
High potential enters burning mode, carries out the update of MCU code.
After entering burning mode referring to Fig. 1, MCU, the charge of capacitor C1 storage is discharged by the first pull down resistor R2, MCU_
The high potential of BOOT_MODE is divided into 0.3 volt by the first pull down resistor R2 (22 kilo-ohms) and pull-up resistor R1 (220 kilo-ohms)
Low potential.
After the completion of code update, MCU is restarted, and the current potential for detecting MCU_BOOT_MODE is 0.3 volt of low potential, into normal
Operating mode.
In this way in the dismounting technology for not needing profession, without completing MCU code in the case of dismounting complete machine and toggle switch
Burning and update, operation is very easy, meanwhile, the time also shorten to the time of only MCU code update, allow MCU code more
It is time saving and energy saving newly to become, simple and easy to operate.
Fig. 2 is a kind of process of MCU code update method provided by one embodiment of the present invention based on circuit shown in Fig. 1
Figure.
Referring to fig. 2, the method comprising the steps of 201: the universal input output pin for passing through MCU exports high potential, diode
Conducting, the delay resistance-capacitance circuit that the start-up mode selection pin of MCU becomes high potential and forms in capacitor and the first pull down resistor
Under the action of keep certain time.
Step 202:MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for high potential, into burning mode, more
Fresh code.
Step 203: the charge of capacitor storage is discharged by the first pull down resistor, and MCU start-up mode selects the height electricity of pin
Position is divided into low potential by the first pull down resistor and pull-up resistor.
Step 204: after the completion of code update, MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for low potential,
Into normal mode of operation.
Through the above steps, the update for completing MCU code, compared with code update method compare, it is fast and simple.
In conclusion this MCU start-up mode selection circuit provided by the invention and the MCU code update based on the circuit
Method realize that MCU is switched to burning mode by normal mode of operation in the case where not dismounting complete machine and toggle switch, complete
The burning of MCU code.The circuit can make MCU avoid dismounting abrasion caused by changer, not need the dismounting technology of profession, simultaneously
The time for shortening MCU code burning allows MCU code burning to become simple and easy to operate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (5)
1. a kind of MCU start-up mode selection circuit, which includes: power supply, single knife switch, pull-up resistor and the first drop-down electricity
Resistance；It is characterized in that, the circuit further comprises: capacitor, diode and the second pull down resistor；
One end of first pull down resistor is connected with one end of the single knife switch, another termination of first pull down resistor
Ground；
The other end of the single knife switch is connected with one end of the pull-up resistor；
Another termination power of the pull-up resistor；
One end of second pull down resistor is grounded；
The other end of second pull down resistor is connected with the universal input output pin of the anode of the diode and MCU；
One end of the capacitor is grounded；
The other end of the cathode of the other end of the capacitor and the diode and the single knife switch, the pull-up resistor
The start-up mode of one end and MCU select pin to be connected；
Wherein, in the case where power supply is certain, the parameter selection of the pull-up resistor and first pull down resistor meets: partial pressure
The pull-up resistor and the output voltage of the single knife switch junction are no more than preset low potential value afterwards；
The capacitor and first pull down resistor composition delay resistance-capacitance circuit, the ginseng of the capacitor and first pull down resistor
Number selection meet: it is described delay resistance-capacitance circuit current potential delay be greater than MCU detecting MCU start-up mode selection pin current potential when
Between.
2. a kind of MCU start-up mode selection circuit as described in claim 1, which is characterized in that the diode is unidirectionally to lead
Electricity, electric current can only flow to MCU start-up mode selection pin from MCU universal input output pin.
3. a kind of MCU start-up mode selection circuit as described in claim 1, which is characterized in that the power supply is 3.3 volts, institute
The resistance value for stating the second pull down resistor is 10 kilo-ohms.
4. a kind of MCU start-up mode selection circuit as described in claim 1, which is characterized in that the diode uses
The diode of RB161M-20 model.
5. a kind of method of MCU code update based on circuit described in any one of claim 1-4, which is characterized in that the party
Method includes:
High potential is exported by the universal input output pin of MCU, the start-up mode selection pin of diode current flow, MCU becomes
High potential simultaneously keeps certain time under the action of the delay resistance-capacitance circuit that capacitor and the first pull down resistor form；
MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for high potential, into burning mode, more fresh code；
The charge of capacitor storage is discharged by the first pull down resistor, and MCU start-up mode selects the high potential of pin to pass through under first
Pull-up resistor and pull-up resistor are divided into low potential；
After the completion of code update, MCU is restarted, and detecting MCU start-up mode selects the current potential of pin for low potential, into normal work
Mode.
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| CN201610994464.8A CN106528237B (en) | 2013-10-18 | 2013-10-18 | MCU start-up mode selection circuit and MCU code update method based on the circuit |
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| CN201610994464.8A CN106528237B (en) | 2013-10-18 | 2013-10-18 | MCU start-up mode selection circuit and MCU code update method based on the circuit |
| CN201310493084.2A CN103577223B (en) | 2013-10-18 | 2013-10-18 | Micro control unit (MCU) startup mode selecting circuit and MCU code updating method based on circuit |
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| CN201310493084.2A Division CN103577223B (en) | 2013-10-18 | 2013-10-18 | Micro control unit (MCU) startup mode selecting circuit and MCU code updating method based on circuit |
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| CN201610994464.8A Active CN106528237B (en) | 2013-10-18 | 2013-10-18 | MCU start-up mode selection circuit and MCU code update method based on the circuit |
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| CN104461664B (en) * | 2014-12-30 | 2018-04-27 | 深圳市辰卓科技有限公司 | MCU start-up mode selection circuits |
| CN106919407B (en) * | 2015-12-26 | 2019-12-03 | 昆达电脑科技(昆山)有限公司 | The method that computer embeds product information synchronized update |
| CN108196855A (en) * | 2018-03-15 | 2018-06-22 | 安徽农业大学 | A kind of device of internet terminal node |
| CN108845807B (en) * | 2018-05-28 | 2022-02-18 | 郑州云海信息技术有限公司 | Solid state disk programming method, device, equipment and storage medium |
| CN108829403B (en) * | 2018-05-28 | 2022-02-18 | 郑州云海信息技术有限公司 | Solid state disk programming method, device, equipment and storage medium |
| CN109634671B (en) * | 2018-11-26 | 2022-06-28 | 晶晨半导体(上海)股份有限公司 | Method for controlling BOOT mode by using integrated chip |
| CN110488726B (en) * | 2019-09-25 | 2021-08-20 | 潍柴动力股份有限公司 | Starting control system and starting method |
| CN112650090B (en) * | 2020-09-25 | 2022-08-09 | 恒烁半导体(合肥)股份有限公司 | MCU chip start mode selection circuit |
| CN112363765B (en) * | 2020-11-04 | 2022-08-19 | 世邦通信股份有限公司 | Circuit and method for automatically switching starting modes of processor |
| WO2022110170A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市锐明技术股份有限公司 | Cpu mode control circuit, vehicle-mounted host device, and vehicle |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106528237A (en) | 2017-03-22 |
| CN103577223B (en) | 2017-01-18 |
| CN103577223A (en) | 2014-02-12 |
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