CN104461664B - MCU start-up mode selection circuits - Google Patents
MCU start-up mode selection circuits Download PDFInfo
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- CN104461664B CN104461664B CN201410852807.8A CN201410852807A CN104461664B CN 104461664 B CN104461664 B CN 104461664B CN 201410852807 A CN201410852807 A CN 201410852807A CN 104461664 B CN104461664 B CN 104461664B
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Abstract
The present invention relates to a kind of MCU start-up modes selection circuit, it includes at least one first circuit and at least a second circuit, wherein, MCU is connected between first circuit and the second circuit, the second circuit includes second switch, and the potential value of the start-up mode selection pin of the MCU is only controlled by the second switch.Compared with prior art, MCU start-up mode selection circuits of the invention have the characteristics that to have a wide range of application, good reliability, good compatibility, the property grasped are good and convenience is good.
Description
Technical field
The present invention relates to MCU start-up modes field, more particularly to a kind of MCU start-up modes selection circuit.
Background technology
The start-up mode of MCU (Micro Control Unit, micro-control unit) is divided into normal mode of operation and burning mould
Formula, burning pattern are used for the burning and renewal of MCU codes.MCU can detect start-up mode selection pin current potential when starting is determined
Surely which kind of pattern entered.If it is low potential to detect start-up mode selection pin, MCU enters normal mode of operation.If detecting
It is high potential to start-up mode selection pin, then MCU enters burning pattern.So MCU needs to select to start-up mode before starting
Pin provides a potential value.
As shown in Figure 1, the MCU start-up mode selection circuits be by a single knife switch J00, a pull-up resistor R01 and
The circuit of one pull down resistor R02 composition, is configured with the potential value to start-up mode selection pin.The start-up mode selects
Under circuit, whens each MCU more fresh codes, is required for first shutting down, and then dismantles complete machine and disconnects single knife switch J00, is reconfigured at starting
The high potential of mode selection pin is so as to entrance burning pattern.After the completion of MCU burnings, then it is closed form to recover single knife switch J00
State, and the low potential of start-up mode selection pin is configured into normal mode of operation, to be finally assembled into complete machine.
There are following defect for this kind of method:(1) continually changer, the dismounting for be easy to causeing MCU complete machines are worn;(2) only
The dismounting technology for having professional person could complete the dismounting of MCU complete machines;(3) MCU recordable times are tediously long, not only comprising code burning
With the time of renewal, changer the time it takes further comprises;(4), can not once start-up mode selection pin configuration finishes
The potential value of pin is selected to be modified start-up mode by external circuits again;(5) the startup mould being partly arranged on core board
Formula selection circuit, can cause single knife switch small, it is necessary to can just be switched over using professional tool, inconvenient profit.
Based on the above problem, the patent No. " 203644016 U of CN ", patent name is a kind of " MCU start-up modes selection electricity
Road " proposes a kind of improved method.As shown in Fig. 2, the delay electricity that this kind of method is formed using pull down resistor R13 and capacitance C14
Road, and by the input and output pin MCU_GPIO of MCU itself come realize start-up mode select pin current potential automatic control and
Keep.In the normal mode of operation, start-up mode is configured by MCU and selects the high potential of pin to enter burning pattern, together
When configure the high potential of input and output pin MCU_FPIO so that capacitance C14 charges and stores.The electricity stored by capacitance C14
Can, and coordinate pull down resistor R13 to form delay circuit so that when the high potential of start-up mode selection pin is maintained one section
Between, until MCU burnings finish, while capacitance C14 is discharged by pull down resistor R13, and pull down resistor R13 divides with pull-up resistor R12
Pressure is so that start-up mode selection pin recovers to low potential, so that MCU reenters normal mode of operation.
But this kind of method still suffers from following defect:(1) the MCU start-up mode selection circuits are only applicable to start-up mode
Selecting pin, MCU enters burning pattern in high potential, when the MCU that has require start-up mode select pin for low level when into
Entering burning pattern can not then realize that application range is relatively narrow;(2) due to being the input and output pin using MCU itself, once MCU
Itself is out of order, and input and output pin and start-up mode will be caused to select pin uncontrollable, so that MCU burnings can not
Lean on, can not even carry out MCU burnings;(3) since different money MCU detection start-up modes select the duration of the level of pin not
Together, therefore this kind keeps start-up mode to select the high potential of pin by the energy storage of the capacitance C14 of delay circuit, starts for MCU
When the method that detects, the compatible poor of MCU start-up mode selection circuits will be caused, when the time is different, the capacitance of delay circuit
The value of C14 and pull down resistor R13 is also not quite similar;(4) during burning first, since part is arranged on the start-up mode on core board
Selection circuit, can cause single knife switch small, it is necessary to can just be switched over using professional tool, inconvenient profit.
The content of the invention
The invention reside in a kind of MCU start-up modes selection circuit is provided, selected for solving MCU start-up modes in the prior art
The problem of selecting relatively narrow circuit application range, poor reliability, poor compatibility, poor and inconvenient operability.
In order to solve the above-mentioned technical problem, the present invention proposes a kind of MCU start-up modes selection circuit, it includes at least 1 the
One circuit and at least a second circuit, wherein, MCU is connected between first circuit and the second circuit;It is each described
First circuit includes first switch, the first pull-up resistor and the first pull down resistor, each second circuit include second switch,
Second pull-up resistor and the second pull down resistor, first pull down resistor are configured as big valued resistor, the first pull-up electricity
Resistance, the second pull-up resistor and second pull down resistor are configured as small valued resistor;Pass through preconfigured big valued resistor
With small valued resistor, no matter the state of the first switch is open-circuit condition or closure state, and the start-up mode of the MCU is selected
The potential value for selecting pin is only controlled by the state of the second switch.
Further, the second circuit is arranged on mainboard, and the mainboard, which is different from, is provided with first circuit and MCU
Core board.
Further, one end of second pull-up resistor is connected to power supply, and the other end is connected to the MCU, institute
State one end of second switch and wherein one end of the first pull-up resistor in first circuit;The one of second pull down resistor
End is connected to ground terminal, and the other end is connected to the other end of the second switch.
Further, one end of first pull-up resistor is connected to one end of power supply and the first switch, institute
The other end for stating the first pull-up resistor is connected to the MCU, wherein one end of the second switch and second electricity
Wherein one end of second pull-up resistor in road;One end of first pull down resistor is connected to ground terminal, and the other end is connected to described
The other end of first switch.
Further, first pull down resistor is -100k ohm of 10k.
Further, first, second pull-up resistor is -10k ohm of 1k.
Further, second pull down resistor is 0-100 ohm.
Further, the second switch is controlled by gating element, to realize that MCU burnings automate.
Further, the second switch is ganged switch.
Further, when the state of the second switch is open-circuit condition, the start-up mode of the MCU selects the electricity of pin
Place value is configured as high level;When the state of the second switch is closure state, the start-up mode of the MCU selects pin
Potential value is configured as low level.
Compared with prior art, MCU start-up mode selection circuits of the invention, have the advantages that:Pass through setting
The second circuit being connected with MCU so that the start-up mode selection pin of MCU is only controlled by the second switch of second circuit, into one
Step is so that the having a wide range of application of MCU start-up mode selection circuits, good reliability, good compatibility, the property grasped are good and convenience is good.
Brief description of the drawings
Fig. 1 is the schematic diagram of the MCU start-up mode selection circuits of the prior art.
Fig. 2 is the schematic diagram of the MCU start-up mode selection circuits of the prior art.
Fig. 3 is the schematic diagram of the MCU start-up mode selection circuits of one embodiment of the invention.
Embodiment
Below with reference to attached drawing, give the present invention further elaboration.
A kind of MCU start-up modes selection circuit provided by the invention includes at least one first circuit and at least one second electricity
Road, wherein, MCU is connected between the first circuit and second circuit.
Every one first circuit includes first switch, the first pull-up resistor and the first pull down resistor, and each second circuit includes
Second switch, the second pull-up resistor and the second pull down resistor, the first pull down resistor are configured as big valued resistor, the first pull-up electricity
Resistance, the second pull-up resistor and the second pull down resistor are configured as small valued resistor.
By preconfigured big valued resistor and small valued resistor, no matter the state of first switch be open-circuit condition or
Closure state, the potential value of the start-up mode selection pin of MCU are only controlled by the state of second switch.
Further, second switch can be controlled by gating element, such as relay, to realize that MCU burnings automate.
By setting the second circuit being connected with MCU so that the start-up mode selection pin of MCU is only controlled by second circuit
Second switch, so as to substantially increase the reliability of MCU burnings, to solve the poor reliability of MCU burnings in the prior art
Problem.
Specifically, the first circuit includes:First switch, the first pull-up resistor and the first pull down resistor.Wherein, the first pull-up
One end of resistance is connected to one end of power supply and first switch, and the other end of the first pull-up resistor is connected to MCU,
Wherein one end of second pull-up resistor in wherein one end of two switches and second circuit.One end of first pull down resistor is connected to
Ground terminal, the other end are connected to the other end of first switch.
Second circuit includes:Second switch, the second pull-up resistor and the second pull down resistor.Wherein, second pull-up resistor
One end is connected to power supply, and the other end is connected to the first pull-up resistor in MCU, one end of second switch and the first circuit
Wherein one end.One end of second pull down resistor is connected to ground terminal, and the other end is connected to the other end of second switch.
Wherein, the first pull down resistor is big valued resistor, and first, second pull-up resistor and the second pull down resistor are small resistance value
Resistance.Standard resistance range as the first pull down resistor of big valued resistor is -100k ohm of 10k.As small valued resistor
First, the Standard resistance range of the second pull-up resistor is -10k ohm of 1k, the Standard resistance range as the second pull down resistor of small valued resistor
For 0-100 ohm.
In general, most products all can be by the core board of one piece of small area comprising processor minimum system and one piece comprising outer
The mainboard for enclosing the larger area of remaining circuit is formed.In order to ensure the versatility of core board and productibility, most MCU are opened
Dynamic mode selection circuit is all disposed within core board, but also have small part MCU start-up modes selection circuit for other consideration and
It is arranged on mainboard.
In the present invention, the first circuit can be arranged on core board or mainboard, and second circuit can also be arranged on core board
Or on mainboard.When second circuit is arranged on mainboard, the second switch in second circuit can use larger switch, make
It is not required professional tool to switch over, and switches so as to fulfill MCU burnings pattern and the quick of normal mode of operation, significantly
The operability and convenience of MCU burnings are improved, is conducive to on-site maintenance and production test.
Fig. 3 is the schematic diagram of the MCU start-up mode selection circuits of one embodiment of the invention, in conjunction with Fig. 3, to the embodiment
Explained as follows.
MCU start-up modes selection circuit includes the first circuit module 1 and second circuit module 2, wherein, the first circuit module
1 includes two first circuits 11,12 in parallel, and second circuit module 2 includes a startup of two second circuits 21,22, MCU in parallel
Mode selection pin Mode0 is connected between the first circuit 12 and second circuit 22, another start-up mode selection pin of MCU
Mode1 is connected between the first circuit 11 and second circuit 21.
First circuit 11 includes first switch K1, the first pull-up resistor R3 and the first pull down resistor R1.Wherein, the first pull-up
One end of resistance R3 is connected to one end of power supply VCC and first switch K1, and the other end of the first pull-up resistor R3 connects respectively
It is connected to the second pull-up resistor R6 in the start-up mode selection pin Mode1 of MCU, one end of second switch K4 and second circuit 21
One end.One end of first pull down resistor R1 is connected to ground terminal, and the other end is connected to the other end of first switch K1.
First circuit 12 includes first switch K2, the first pull-up resistor R4 and the first pull down resistor R2.Wherein, the first pull-up
One end of resistance R4 is connected to one end of power supply VCC and first switch K2, and the other end of the first pull-up resistor R4 connects respectively
It is connected to the second pull-up resistor R5 in the start-up mode selection pin Mode0 of MCU, one end of second switch K3 and second circuit 22
One end.One end of first pull down resistor R2 is connected to ground terminal, and the other end is connected to the other end of first switch K2.
Second circuit 21 includes second switch K4, the second pull-up resistor R6 and the second pull down resistor R8.Wherein, the second pull-up
One end of resistance R6 is connected to power supply VCC, and the other end is connected to start-up mode selection pin Mode1, the second switch of MCU
The other end of first pull-up resistor R3 in one end of K4 and the first circuit 11.One end of second pull down resistor R8 is connected to ground
End, the other end are connected to the other end of second switch K4.
Second circuit 22 includes second switch K3, the second pull-up resistor R5 and the second pull down resistor R7.Wherein, the second pull-up
One end of resistance R5 is connected to power supply VCC, and the other end is connected to start-up mode selection pin Mode0, the second switch of MCU
The other end of first pull-up resistor R4 in one end of K3 and the first circuit 12.One end of second pull down resistor R7 is connected to ground
End, the other end are connected to the other end of second switch K3.
Now using first pull down resistor R1, R2 as 68k ohm, first pull-up resistor R3, R4 is 4.7k ohm, the second pull-up electricity
It is 4.7k ohm to hinder R5, R6, and exemplified by second pull down resistor R7, R8 is 0 ohm, pin is selected to start-up mode in this implementation
Mode0, Mode1 state illustrate, as shown in table 1.
Table 1
As shown in Table 1, no matter which kind of state first switch K1 is in, the potential value of start-up mode selection pin Mode1 is only
It is controlled by second switch K4, i.e. when second switch K4 is closed, start-up mode selection pin Mode1 is configured to low level, and second opens
When closing K4 open circuits, start-up mode selection pin Mode1 is configured to high level.Regardless of whether it is that start-up mode selects pin with high level
When MCU enter burning pattern, or start-up mode selection pin enters burning pattern with MCU during low level, can conveniently soon
Promptly realized by controlling the unlatching of second switch K3, K4 to close so that the application range of MCU start-up mode selection circuits is able to
Expand.
In addition, it need to only ensure that the resistance value of the first pull down resistor R1 is much larger than the second pull-up resistor R6, the first pull-up resistor R3
And second pull down resistor R8 resistance value, you can to realize each state of the selection pin of start-up mode in table 1 Mode1, without by
It is limited to the actual duration of the level of MCU detection start-up mode selection pins, even if the duration of the MCU of different moneys is not quite similar,
Also the resistance value for choosing each resistance again per money MCU need not be directed to, substantially increases the compatible of the MCU start-up mode selection circuits
Property, be conducive to on-site maintenance and production test.
The current potential switching of start-up mode selection pin Mode0 is then only controlled by second switch K3, remaining and Mode1 basic one
Cause, do not repeating herein.
In the present embodiment, second switch K3, the K4 being arranged on mainboard are ganged switch, so only need to stir it
In any one switch, you can so that the current potential of two start-up modes selection pin Mode0, Mode1 in MCU is realized and cut at the same time
Change.
In conclusion the second circuit that a kind of MCU start-up modes selection circuit of the present invention is connected by setting with MCU,
So that the start-up mode selection pin of MCU is only controlled by the second switch of second circuit, so that substantially increase MCU burnings can
By property;Each pull-up of first circuit and second circuit, pull down resistor, without directly contacting, are not only restricted to MCU detections with MCU itself
The actual duration of the level of start-up mode selection pin, substantially increases the compatibility of MCU start-up mode selection circuits, favorably
Which kind of in on-site maintenance and production test, and it is not only restricted to enter burning pattern or normal mode of operation in a manner of level, significantly
Extend the application range of MCU start-up mode selection circuits;By the way that second circuit is arranged on mainboard, second switch can on mainboard
To use larger switch so that be not required professional tool to switch over, so as to fulfill MCU burnings pattern and normal work
The quick switching of pattern, substantially increases the operability of MCU burnings, is conducive to on-site maintenance and production test;By making
Two switches are controlled by gating element so that automation is realized in MCU burnings;By being used as second switch using ganged switch so that MCU
In multiple start-up modes selection pin current potential can realize while switch.
The above, is only presently preferred embodiments of the present invention, is not intended to limit embodiment of the present invention, this area is general
Logical technical staff's central scope according to the present invention and spirit, can very easily carry out corresponding flexible or modification, therefore originally
The protection domain of invention should be subject to the protection domain required by claims.
Claims (8)
- A kind of 1. MCU start-up modes selection circuit, it is characterised in that including at least one first circuit and at least a second circuit, Wherein, MCU is connected between first circuit and the second circuit;Each first circuit includes first switch, the One pull-up resistor and the first pull down resistor, each second circuit include second switch, the second pull-up resistor and the second drop-down Resistance, first pull down resistor are configured as big valued resistor, first pull-up resistor, the second pull-up resistor and described Two pull down resistors are configured as small valued resistor;By preconfigured big valued resistor and small valued resistor, no matter described The state of one switch is open-circuit condition or closure state, and the potential value of the start-up mode selection pin of the MCU is only controlled by The state of the second switch;One end of second pull-up resistor is connected to power supply, and the other end is connected to the MCU, the one of the second switch Wherein one end of first pull-up resistor in end and first circuit;One end of second pull down resistor is connected to ground terminal, The other end is connected to the other end of the second switch;One end of first pull-up resistor is connected to one end of power supply and the first switch, first pull-up resistor The other end be connected in the MCU, wherein one end of the second switch and the second circuit the second pull-up electricity Wherein one end of resistance;One end of first pull down resistor is connected to ground terminal, and the other end is connected to the another of the first switch End.
- 2. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the second circuit is arranged on mainboard, institute State mainboard and be different from the core board for being provided with first circuit and MCU.
- 3. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that first pull down resistor for 10k- 100k ohm.
- 4. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that first, second pull-up resistor is - 10k ohm of 1k.
- 5. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that second pull down resistor is 0-100 Ohm.
- 6. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the second switch is by gating element Control, to realize that MCU burnings automate.
- 7. MCU start-up modes selection circuit as claimed in claim 1, it is characterised in that the second switch is ganged switch.
- 8. such as claim 1 to 7 any one of them MCU start-up mode selection circuits, it is characterised in that when the second switch State be open-circuit condition, the potential value of the start-up mode selection pin of the MCU is configured as high level;Open when described second The state of pass is closure state, and the potential value of the start-up mode selection pin of the MCU is configured as low level.
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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 |
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