CN106528237A - Micro control unit (MCU) start mode selection circuit and MCU code upgrading method based on same - Google Patents
Micro control unit (MCU) start mode selection circuit and MCU code upgrading method based on same Download PDFInfo
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- CN106528237A CN106528237A CN201610994464.8A CN201610994464A CN106528237A CN 106528237 A CN106528237 A CN 106528237A CN 201610994464 A CN201610994464 A CN 201610994464A CN 106528237 A CN106528237 A CN 106528237A
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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
Abstract
The present invention discloses a micro control unit (MCU) start mode selection circuit and an MCU code upgrading method based on same. The circuit comprises a power supply, a single-pole switch, a pull-up resistor, and a first pull-down resistor, and further comprises a capacitor, a diode and a second pull-down resistor. One end of the first pull-down resistor is connected with one end of the single-pole switch, and the other end of the first pull-down resistor is grounded. The other end of the single-pole switch is connected with one end of the pull-up resistor. The other end of the pull-up resistor is connected with the power supply. One end of the second pull-down resistor is grounded. The other end of the second pull-down resistor is connected with the positive pole of the diode and an MCU general purpose input output pin. One end of the capacitor is grounded, and the other end of the capacitor is connected with the negative pole of the diode, the other end of the single-pole switch, one end of the pull-up resistor, and an MCU start mode selection pin. According to the circuit, MCU code can be upgraded without assembling and disassembling and toggling the switch, the MCU code upgrading time is shortened as long as the time of code programming, so that the MCU code upgrading is easy to perform.
Description
Present patent application is the applying date on October 18th, 2013, Application No. 201310493084.2, entitled
The division Shen of the Chinese invention patent application of " MCU start-up modes selection circuit and the MCU code update methods based on the circuit "
Please.
Technical field
The present invention relates to micro-control unit (Micro Control Unit, MCU) start-up mode field, and in particular to MCU
Start-up mode selection circuit and the MCU code update methods based on the circuit.
Background technology
The start-up mode of MCU is divided into normal mode of operation and burning pattern, and burning pattern is used for the burning of MCU codes and more
Newly.MCU can detect start-up mode and select the current potential of pin determining into which kind of pattern when starting.If detecting start-up mode choosing
It is electronegative potential to select pin, then MCU enters normal mode of operation, if detect start-up mode to select pin is high potential, MCU enters
Enter burning pattern.So needing to select one potential value of pin to MCU start-up modes before MCU starts.
Start-up mode selection circuit of the prior art is by a single knife switch, a pull-up resistor and a drop-down electricity
The circuit of resistance composition selects the potential value of pin to configure MCU start-up modes.Under existing start-up mode selection circuit, every time
Shutdown is required for during MCU more fresh codes, whole machine is taken apart and is then turned off switching the high potential that pin is selected to configure MCU start-up modes
Into burning pattern, to carry out the burning and renewal of MCU codes.After the completion of MCU more fresh codes, need to recover switch for closure
State, is then assembled into whole machine, configures MCU start-up modes and selects the electronegative potential of pin to enter normal mode of operation.
This mode has following defect：First, continually changer, easily causes the dismounting abrasion of the whole machines of MCU；Second,
Professional dismounting technology is needed just to complete the dismounting work of MCU；The time of the 3rd, MCU code update is tediously long, the code of MCU
The time of renewal not only includes code recordable time, the time for also spending comprising changer.
The content of the invention
In view of the above problems, it is proposed that the present invention so as to provide one kind overcome the problems referred to above or at least in part solve on
State the MCU start-up modes selection circuit and the MCU code update methods based on the circuit of problem.
To reach above-mentioned purpose, the technical scheme is that what is be achieved in that：According to an aspect of the present invention, there is provided
A kind of MCU start-up modes selection circuit, the circuit include：Power supply, single knife switch, pull-up resistor and the first pull down resistor composition
Circuit；Further, the circuit also includes：Electric capacity, 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 ground connection of the second pull down resistor；The other end of the second pull down resistor and the positive pole of diode and MCU's is logical
It is connected with input and output pin.
One end ground connection of electric capacity, the other end of electric capacity are electric with the other end of the negative pole of diode and single knife switch, pull-up
One end of resistance and the start-up mode of MCU select pin to be connected.
In this circuit that the present invention is provided, in the case where power supply is certain, the ginseng of pull-up resistor and the first pull down resistor
Number selects to meet：After partial pressure, the output voltage of pull-up resistor and single knife switch junction is less than default electronegative potential value.
In this circuit that the present invention is provided, electric capacity and the first pull down resistor composition time delay resistance-capacitance circuit, electric capacity and the
The parameter of one pull down resistor selects to meet：The current potential time delay of time delay resistance-capacitance circuit selects pin more than MCU detecting MCU start-up modes
The time of current potential.
According to another aspect of the present invention, there is provided a kind of one kind based on the invention described above one side circuit
The method of MCU code updates, the method include：
High potential is exported by the universal input output pin of MCU, diode current flow, the start-up mode of MCU select pin
Be changed into high potential and certain hour is kept in the presence of the time delay resistance-capacitance circuit that electric capacity and the first pull down resistor are constituted.
MCU is restarted, and it is high potential to detect MCU start-up modes and select the current potential of pin, into burning pattern, more fresh code.
The electric charge of electric capacity storage is discharged by the first pull down resistor, and MCU start-up modes select the high potential of pin to pass through the
One pull down resistor and pull-up resistor are divided into electronegative potential.
After the completion of code update, MCU is restarted, and it is electronegative potential to detect MCU start-up modes and select the current potential of pin, enters normal
Mode of operation.
This MCU start-up modes selection circuit of the present invention, realizes MCU in the case where whole machine and toggle switch is not dismounted
Burning pattern is switched to by normal mode of operation, the burning of MCU codes is completed.The circuit can make MCU avoid what changer was caused
Dismounting abrasion, it is not necessary to the dismounting technology of specialty, while shortening the time of MCU code burnings, allows MCU code burnings to become letter
Easy operation.
Description of the drawings
Fig. 1 is a kind of circuit diagram of MCU start-up modes selection circuit that one embodiment of the invention is provided；
Fig. 2 is a kind of flow process of the MCU code update methods based on circuit shown in Fig. 1 that one embodiment of the invention is provided
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
The core concept of the present invention is that the universal input of the delay circuit and MCU constituted using pull down resistor and electric capacity is defeated
Go out pin (General Purpose Input Output, GPIO) to realize that start-up mode selects the automatic control of pin current potential and guarantor
Hold, so in the normal mode of operation, it is high potential start-up mode to be controlled by MCU and selects the current potential of pin, so as to switch
To burning pattern, after the completion of code update, start-up mode selects the high potential of pin to return to low electricity by electric discharge, partial pressure again
Position, MCU enter normal mode of operation.
Fig. 1 is a kind of circuit diagram of MCU start-up modes selection circuit that one embodiment of the invention is provided.The present invention this
Planting MCU start-up mode selection circuits includes：Power supply, single knife switch, pull-up resistor and the first pull down resistor；The circuit is further wrapped
Include：Electric capacity, 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 positive pole of diode and MCU.
One end ground connection of electric capacity, the other end of electric capacity are electric with the other end of the negative pole of diode and single knife switch, pull-up
One end of resistance and the start-up mode of MCU select pin to be connected.
Referring to Fig. 1, the MCU start-up mode selection circuits of the present embodiment include power supply, single knife switch J1, pull-up resistor R1 and
First pull down resistor R2；Further comprise：Electric capacity 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 is grounded.
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 of the second pull down resistor R3 is with diode D1 just
The universal input output pin (MCU_GPIO) of pole and MCU is connected.
Referring to Fig. 1, one end ground connection of electric capacity C1, the other end of electric capacity C1 and the negative pole of diode D1 and single knife switch J1
The other end, one end of pull-up resistor R1 and MCU start-up mode select pin (MCU_BOOT_MODE) be connected.
In the case where power supply is certain, the parameter of pull-up resistor R1 and the first pull down resistor R2 selects to meet：On after partial pressure
The output voltage of pull-up resistor R1 and single knife switch J1 junctions is less than default electronegative potential value.
In one embodiment of the invention, power supply is 3.3 volts, in order to ensure pull-up resistor R1 and single knife switch J1 connections
Ginseng of the voltage exported after the partial pressure at place less than 0.3 volt of default electronegative potential value, pull-up resistor R1 and the first pull down resistor R2
Number selects the condition that the ratio for meeting pull-up resistor R1 and the first pull down resistor R2 resistances is 10/1.
Specifically, pull-up resistor R1 is 220 kilo-ohms, and the first pull down resistor R2 is 22 kilo-ohms, is 3.3 volts so in power supply
In the case of, the voltage exported after pull-up resistor R1 and the first pull down resistor R2 partial pressures is 0.3 volt of electronegative potential.
Certainly in other embodiments of the invention, power supply can select other parameters, be not limited to a reality of the invention
Apply 3.3 volts in example, the value of electronegative potential can also carry out pre- according to the relevant parameter of specific MCU start-up modes selection circuit
If, the electronegative potential of 0.3 volt be not limited in one embodiment of the invention.
The parameter of electric capacity and the first pull down resistor composition time delay resistance-capacitance circuit, electric capacity and the first pull down resistor selects satisfaction to prolong
When resistance-capacitance circuit current potential time delay detect the time that MCU start-up modes select pin current potential more than MCU.
In one embodiment of the invention, electric capacity C1 and the first pull down resistor R2 compositions time delay resistance-capacitance circuit, electric capacity C1
Select to meet with the parameter of the first pull down resistor R2:The current potential time delay of time delay resistance-capacitance circuit is more than MCU detecting MCU start-up mode choosings
Select the time of pin current potential.Specifically, the first pull down resistor R2 is 22 kilo-ohms, and electric capacity C1 is 47 microfarads, default MCU detectings
The time of MCU_BOOT_MODE pin current potentials is 1 second, so can obtain delay time more than 1 second according to delay time computing formula.
It is appreciated that in other embodiments of the invention, the time of MCU detecting MCU_BOOT_MODE pin current potentials is not
It is limited to 1 second, the selection of electric capacity value should be carried out to constitute rc-delay circuit according to the relevant parameter in actual 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 is high potential.The resistance of the second pull down resistor R3
For 10 kilo-ohms.
In one embodiment of the invention, diode D1 uses the diode of RB161M-20 models.
The burning of MCU codes under the circuit is divided into two kinds of situations, first burning and second and later code update.Specifically
Process is described below：
MCU burning codes first
Burning code is before assembly to MCU first, that is to say, that code burning is good when mainboard, then group again
Dress up whole machine.MCU first burning code when, no data in MCU chip, present space state, it is impossible to enable MCU start-up modes
Select the automatic control and holding of pin current potential.Referring to Fig. 1, the process of MCU burning codes first is：First shut down, be then turned off hilted broadsword
Switch J1, it is high potential that configuration start-up mode selects the voltage of pin MCU_BOOT_MODE, and start, power supply will be 3.3 volts of height electric
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 pattern, enters line code burning.After the completion of code burning, single knife switch J1 is shut down and is closed, is started shooting after single knife switch J1 closures,
By pull-up resistor R1 and the first pull down resistor R2 partial pressures, 3.3 volts of high voltage, the low-voltage output for being divided into 0.3 volt are arrived
MCU_BOOT_MODE.MCU detects the electronegative potential of MCU_BOOT_MODE hence into normal mode of operation.By above-mentioned steps
Complete the code burning first of MCU.
Second of MCU and later more fresh code
This MCU start-up modes selection circuit that the present invention is provided is primarily adapted for use in second of MCU and later more fresh code
Situation.Referring to Fig. 1, the electric capacity C1 in the circuit is used for the electric charge that storage is input into 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 so that the electric charge of MCU_BOOT_MODE is bled off by the first pull down resistor R2, prevents MCU_BOOT_
The Charge back flow of MODE and pass through that the second pull down resistor R3 is too fast to be bled off.
Electric capacity C1 and the first pull down resistor R2 composition time delay resistance-capacitance circuits.In order to ensure that MCU can be detected when restarting
Start-up mode selects the high potential of pin, so that MCU enters burning pattern, the resistance of time delay in one embodiment of the invention
The delay time of capacitive circuit was needed more than 1 second.
The process of second of MCU and later more fresh code is specially：
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 conductings, MCU_BOOT_MODE is changed into high potential, due to the electric charge store function of electric capacity 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 pattern, carries out the renewal of MCU codes.
Referring to Fig. 1, after MCU enters burning pattern, the electric charge of electric capacity C1 storages 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)
Electronegative potential.
After the completion of code update, MCU is restarted, and the current potential for detecting MCU_BOOT_MODE is 0.3 volt of electronegative potential, enters normal
Mode of operation.
So in the dismounting technology for not needing specialty, without completing MCU codes in the case of the whole machine of dismounting and toggle switch
Burning and renewal, operation is very easy, meanwhile, the time also shorten to the time of only MCU code updates, allows MCU codes more
It is time saving and energy saving newly to become, simple and easy to operate.
Fig. 2 is a kind of flow process of the MCU code update methods based on circuit shown in Fig. 1 that one embodiment of the invention is provided
Figure.
Referring to Fig. 2, the method comprising the steps of 201：High potential, diode are exported by the universal input output pin of MCU
Conducting, the start-up mode of MCU select pin to be changed into high potential and in electric capacity and the time delay resistance-capacitance circuit of the first pull down resistor composition
In the presence of keep certain hour.
Step 202：MCU is restarted, and it is high potential to detect MCU start-up modes and select the current potential of pin, into burning pattern, more
Fresh code.
Step 203：The electric charge of electric capacity storage is discharged by the first pull down resistor, and MCU start-up modes select the height electricity of pin
Position is divided into electronegative potential by the first pull down resistor and pull-up resistor.
Step 204：After the completion of code update, MCU is restarted, and it is electronegative potential to detect MCU start-up modes and select the current potential of pin,
Into normal mode of operation.
By above-mentioned steps, complete the renewal of MCU codes, compared with code update method compare, it is fast and simple.
In sum, the present invention is provided this MCU start-up modes selection circuit and the MCU code updates based on the circuit
Method realize that in the case where whole machine and toggle switch is not dismounted MCU is switched to burning pattern by normal mode of operation, complete
The burning of MCU codes.The circuit can make MCU avoid the dismounting abrasion that changer is caused, it is not necessary to the dismounting technology of specialty, while
The time of MCU code burnings is shortened, allows MCU code burnings to become simple and easy to operate.
Presently preferred embodiments of the present invention is the foregoing is only, protection scope of the present invention is not intended to limit.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (5)
1. a kind of MCU start-up modes selection circuit, the circuit include：Power supply, single knife switch, pull-up resistor and the first drop-down electricity
Resistance；Characterized in that, the circuit is further included：Electric capacity, 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 ground connection of second pull down resistor；
The other end of second pull down resistor is connected with the universal input output pin of the positive pole and MCU of the diode；
One end ground connection of the electric capacity；
The other end of the other end of the electric capacity and the negative pole and the single knife switch of the diode, the pull-up resistor
The start-up mode of one end and MCU selects pin to be connected；
Wherein, in the case where power supply is certain, the pull-up resistor selects to meet with the parameter of first pull down resistor：Partial pressure
The output voltage of the pull-up resistor and the single knife switch junction is less than default electronegative potential value afterwards；
The ginseng of the electric capacity and first pull down resistor composition time delay resistance-capacitance circuit, the electric capacity and first pull down resistor
Number selects to meet：The current potential time delay of the time delay resistance-capacitance circuit more than MCU detect MCU start-up modes select pin current potential when
Between.
2. a kind of MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the diode is unidirectional
Electricity, electric current can only flow to MCU start-up modes from MCU universal input output pins and select pin.
3. a kind of MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the power supply is 3.3 volts, institute
The resistance for stating the second pull down resistor is 10 kilo-ohms.
4. a kind of MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the diode is used
The diode of RB161M-20 models.
5. based on circuit any one of claim 1-4 a kind of MCU code updates method, it is characterised in that the party
Method includes：
High potential is exported by the universal input output pin of MCU, diode current flow, the start-up mode of MCU select pin to be changed into
High potential simultaneously keeps certain hour in the presence of the time delay resistance-capacitance circuit that electric capacity and the first pull down resistor are constituted；
MCU is restarted, and it is high potential to detect MCU start-up modes and select the current potential of pin, into burning pattern, more fresh code；
The electric charge of electric capacity storage is discharged by the first pull down resistor, and MCU start-up modes select the high potential of pin to pass through under first
Pull-up resistor and pull-up resistor are divided into electronegative potential；
After the completion of code update, MCU is restarted, and it is electronegative potential to detect MCU start-up modes and select the current potential of pin, into normal work
Pattern.
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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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| 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 |
| 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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| 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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| CN201310493084.2A Active 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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| CN106919407A (en) * | 2015-12-26 | 2017-07-04 | 昆达电脑科技(昆山)有限公司 | The method of the embedded product information synchronized update of computer |
| CN109634671A (en) * | 2018-11-26 | 2019-04-16 | 晶晨半导体(上海)股份有限公司 | A method of BOOT mode is controlled using integrated chip |
| CN112363765A (en) * | 2020-11-04 | 2021-02-12 | 世邦通信股份有限公司 | Circuit and method for automatically switching starting modes of processor |
| CN112650090A (en) * | 2020-09-25 | 2021-04-13 | 合肥恒烁半导体有限公司 | MCU chip start mode selection 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106528237B (en) | 2019-10-18 |
| CN103577223A (en) | 2014-02-12 |
| CN103577223B (en) | 2017-01-18 |
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