CN1838028A - Digital circuit reset method and system - Google Patents
Digital circuit reset method and system Download PDFInfo
- Publication number
- CN1838028A CN1838028A CN 200610077622 CN200610077622A CN1838028A CN 1838028 A CN1838028 A CN 1838028A CN 200610077622 CN200610077622 CN 200610077622 CN 200610077622 A CN200610077622 A CN 200610077622A CN 1838028 A CN1838028 A CN 1838028A
- Authority
- CN
- China
- Prior art keywords
- circuit
- microprocessor
- digital
- signal processing
- reset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
Images
Landscapes
- Electronic Switches (AREA)
Abstract
This invention relates to a digital circuit reset method and system. Wherein, using a detection circuit to detect the DSP circuit state and send result to a MPU; if abnormal, sending a reset signal from the MPU to DSP circuit. This invention can reset the DSP circuit at the moment of losing power to improve its performance, only adds a detection circuit with simple structure, and thereby has wide market application future.
Description
[technical field]
The present invention relates to the design field of digital circuit, relate in particular to a kind of repositioning method and system of digital circuit.
[background technology]
The digit chip that uses in the colour television set is more and more now, and when electrical network instant cut-off or high-speed switch power supply, digital circuit partly is easy to the malreduction problem occur, thereby causes the system works disorder.Existing resetting is reset to the basis with microprocessor (MCU), and reset signal is mainly sent by MCU, specifically referring to Fig. 1.
When system's power down, the MCU power supply drops to certain amplitude thereupon, and reset circuit resets MCU.After the MCU power supply was normal again, MCU reinitialized, and sent reset signal to other circuit (especially digital signal processing circuit) of system.Because the MCU source current is very little, and the electric current of digital signal processing circuit part power supply is very big, with respect to the power-supply fluctuation of same amplitude, the digital signal processing circuit power supply is faster than MCU power down.When system's instant power-down, the power down of digital signal processing circuit power supply very likely appears, and the MCU power supply does not have the phenomenon of power down, at this time MCU is not because power supply has power down, oneself can not reset, also can not know the digital signal processing circuit power supply moment undesired, can not send reset signal to digital signal processing circuit, at this time digital signal processing circuit is not easy to occur the disorderly problem of work owing to reset.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of repositioning method and system of digital circuit, when power down, can digital signal processing circuit be resetted, thereby guarantees the digital signal processing circuit operate as normal.
The present invention realizes by following technical scheme:
A kind of repositioning method of digital circuit may further comprise the steps:
101, testing circuit detects the power supply status of digital signal processing circuit, and testing result is sent to microprocessor;
102, as if the testing result abnormal state, then microprocessor is exported a reset signal to digital signal processing circuit.
Microprocessor carries out analyzing and processing to described testing result in the step 101, and then judges the state of testing result.
Step 102 also comprises: if the testing result state is normal, then microprocessor is not exported described reset signal to digital signal processing circuit.
Digital signal processing circuit is after receiving described reset signal in the step 102, and the circuit of its inside is carried out initialization again.
Described testing result is a pulse signal.
A kind of resetting system of digital circuit, comprise: microprocessor, also comprise testing circuit, described testing circuit detects the power supply status of digital signal processing circuit, and export the relevant detection result for described microprocessor, microprocessor is correspondingly exported a reset signal to digital signal processing circuit according to testing result.
Described testing circuit is a pulse generating circuit, the input end of described pulse generating circuit connects the power supply of described digital signal processing circuit, its output terminal connects the RESET input of microprocessor, and the reset output terminal of microprocessor links to each other with the RESET input of digital signal processing circuit.
The RESET input of described microprocessor and its reset output terminal are same port.
Described pulse generating circuit comprises first to the 4th resistance and the triode; The emitter of described triode is as the input end of pulse generating circuit, and the two ends of the series arm of first resistance and second resistance are connected on the emitter and base stage of triode; The collector of described triode is by the 3rd resistance eutral grounding; One end of the 4th resistance is as the output terminal of pulse generating circuit, and the other end is connected on the collector of triode.
Described pulse generating circuit also comprises voltage stabilizing diode, the plus earth of described voltage stabilizing diode, and its negative electrode is connected on the tie point of first resistance and second resistance.
Because adopt above technical scheme, the present invention can in time reset to digital signal processing circuit in the moment of digital signal processing circuit power down, had improved the serviceability of digital signal processing circuit, guarantee the digital signal processing circuit operate as normal; System of the present invention only increases a testing circuit, and is simple in structure, realizes easily, can bring the reliability of circuit working at lower cost, has vast market prospect.
[description of drawings]
Fig. 1 is the system chart that in the prior art digital circuit is resetted.
Fig. 2 is the system chart that digital circuit is resetted of the present invention.
Fig. 3 is the part physical circuit figure of system of the present invention.
Fig. 4 is a method flow diagram of the present invention.
[embodiment]
Below in conjunction with drawings and Examples the present invention is further set forth:
As shown in Figure 2, a kind of resetting system of digital circuit, comprise: microprocessor MCU, pulse generating circuit, the input end of described pulse generating circuit connects the power supply of described digital signal processing circuit, its output terminal connects the RESET input of microprocessor, and the reset output terminal of microprocessor links to each other with the RESET input of digital signal processing circuit.Wherein, the RESET input of microprocessor and its reset output terminal can be same ports, also can be different ports.Pulse generating circuit is equivalent to a testing circuit, it detects the power supply status that detects digital signal processing circuit, and export corresponding electric pulse for described microprocessor, microprocessor is according to the electric pulse that receives, the current state that whether is in power down of determination number word signal processing circuit, if be in power-down state, then microprocessor is correspondingly exported a reset signal to digital signal processing circuit, otherwise, not to digital signal processing circuit output reset signal.
As shown in Figure 3, digital signal processing circuit has two, is designated as: digital signal processing circuit 1 and digital signal processing circuit 2 (reset terminal is Reset), and adopting model respectively is the chip of PW1239 and PW2300; The model of microprocessor MCU is TMP91.Microprocessor MCU has two ends that reset (Reset1 and Reset2), be connected with digital signal processing circuit 1 the RESET input respectively with digital signal processing circuit 2, wherein, also as the RESET input of microprocessor MCU, this end is used for the electric impulse signal of received pulse generation circuit to the Reset1 port.
Pulse generating circuit comprises first to the 4th resistance (R1, R2, R3, R4), voltage stabilizing diode D1 and triode Q1; The emitter of described triode Q1 is as the input end of pulse generating circuit, the power supply of this termination digital signal processing circuit; The two ends of the series arm of first resistance R 1 and second resistance R 2 are connected on the emitter and base stage of triode Q1; The collector of described triode Q1 is by the 3rd resistance R 3 ground connection; One end of the 4th resistance R 4 is as the output terminal of pulse generating circuit, and the other end is connected on the collector of triode Q1; The plus earth of described voltage stabilizing diode D1, its negative electrode are connected on the tie point of first resistance R 1 and second resistance R 2.Pulse generating circuit has a variety of implementations, does not just enumerate one by one here.
When system's normal boot-strap and operate as normal, send various reset signals by actual needs by microprocessor MCU.During the system instant power-down, the power down thereupon of the power supply of digital signal processing circuit, electric pulse of pulse generating circuit output.Microprocessor MCU sends reset signal one time to system after detecting the electric pulse that pulse generating circuit sends again, and total system reinitializes, and guarantees that system can not occur because the disorder that power down occurs.When microprocessor MCU output reset pulse, the Reset1 port switches to output state, other the time all switch to input state.
What need be illustrated is, pulse generating circuit generally is connected on the fastest power supply of system's power down, can connect one the tunnel, also can connect multiple power supplies, and guaranteeing can the sensitive system that detects power-down conditions.Connection between digital signal processing circuit, microprocessor MCU, the pulse generating circuit both can a shared line, also can use separately independently line, can both realize purpose of the present invention.
As shown in Figure 4, for realizing the method flow diagram of the object of the invention, detailed process is as follows:
The first step: testing circuit detects the power supply status of digital signal processing circuit, and testing result is sent to microprocessor; Microprocessor carries out analyzing and processing to described testing result, and whether microprocessor detects testing circuit pulse signal output, if having, illustrates that the fluctuation of power supply is bigger, can think the situation of power down, and testing result is unusual; Otherwise, illustrate that then power supply still is in more stable state, think that current situation does not belong to the situation of power down, testing result is normal.
Second step: if the testing result abnormal state, then microprocessor is exported a reset signal to digital signal processing circuit; If the testing result state is normal, then microprocessor is not exported described reset signal to digital signal processing circuit.
The 3rd step: digital signal processing circuit carries out initialization again to the circuit of its inside after receiving described reset signal.
In sum, the present invention can with very low cost solve the instant power-down of colour television set and occur owing to do not have The system disorders problem that resets and cause.
Claims (10)
1, a kind of repositioning method of digital circuit may further comprise the steps:
101, testing circuit detects the power supply status of digital signal processing circuit, and testing result is sent to microprocessor;
102, as if the testing result abnormal state, then microprocessor is exported a reset signal to digital signal processing circuit.
2, the repositioning method of a kind of digital circuit according to claim 1 is characterized in that, microprocessor carries out analyzing and processing to described testing result in the step 101, and then judges the state of testing result.
3, the repositioning method of a kind of digital circuit according to claim 1 is characterized in that, step 102 also comprises: if the testing result state is normal, then microprocessor is not exported described reset signal to digital signal processing circuit.
4, the repositioning method of a kind of digital circuit according to claim 1 is characterized in that, digital signal processing circuit carries out initialization again to the circuit of its inside in the step 102 after receiving described reset signal.
5, the repositioning method of a kind of digital circuit according to claim 1 is characterized in that, described testing result is a pulse signal.
6, a kind of resetting system of digital circuit, comprise: microprocessor, it is characterized in that: also comprise testing circuit, described testing circuit detects the power supply status of digital signal processing circuit, and export the relevant detection result for described microprocessor, microprocessor is correspondingly exported a reset signal to digital signal processing circuit according to testing result.
7, the resetting system of a kind of digital circuit according to claim 6, it is characterized in that: described testing circuit is a pulse generating circuit, the input end of described pulse generating circuit connects the power supply of described digital signal processing circuit, its output terminal connects the RESET input of microprocessor, and the reset output terminal of microprocessor links to each other with the RESET input of digital signal processing circuit.
8, the resetting system of a kind of digital circuit according to claim 7 is characterized in that: the RESET input of described microprocessor and its reset output terminal are same port.
9, according to the resetting system of claim 7 or 8 described a kind of digital circuits, it is characterized in that: described pulse generating circuit comprises first to the 4th resistance (R1, R2, R3, R4) and triode (Q1); The emitter of described triode (Q1) is as the input end of pulse generating circuit, and the two ends of the series arm of first resistance (R1) and second resistance (R2) are connected on the emitter and base stage of triode (Q1); The collector of described triode (Q1) is by the 3rd resistance (R3) ground connection; One end of the 4th resistance (R4) is as the output terminal of pulse generating circuit, and the other end is connected on the collector of triode (Q1).
10, the resetting system of a kind of digital circuit according to claim 9, it is characterized in that: described pulse generating circuit also comprises voltage stabilizing diode (D1), the plus earth of described voltage stabilizing diode (D1), its negative electrode are connected on the tie point of first resistance (R1) and second resistance (R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610077622XA CN1838028B (en) | 2006-04-13 | 2006-04-13 | Digital circuit reset system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610077622XA CN1838028B (en) | 2006-04-13 | 2006-04-13 | Digital circuit reset system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1838028A true CN1838028A (en) | 2006-09-27 |
| CN1838028B CN1838028B (en) | 2012-01-18 |
Family
ID=37015442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610077622XA Expired - Fee Related CN1838028B (en) | 2006-04-13 | 2006-04-13 | Digital circuit reset system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1838028B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704537A (en) * | 2016-03-28 | 2016-06-22 | 深圳市九洲电器有限公司 | Set-top-box resetting system and set-top-box |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9113924D0 (en) * | 1991-06-27 | 1991-08-14 | Thomson Consumer Electronics | Fault protection using microprocessor power up reset |
-
2006
- 2006-04-13 CN CN200610077622XA patent/CN1838028B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704537A (en) * | 2016-03-28 | 2016-06-22 | 深圳市九洲电器有限公司 | Set-top-box resetting system and set-top-box |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1838028B (en) | 2012-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103904620B (en) | A kind of DC supply input counnter attack fills circuit and method | |
| CN102842885A (en) | Protecting circuit and electronic device with same | |
| CN203025322U (en) | Detecting device of direct-current feeder switch | |
| CN102097789B (en) | Over-current or short-circuit state detection circuit of insulated gate bipolar transistor (IGBT) | |
| CN1838028A (en) | Digital circuit reset method and system | |
| CN108551159B (en) | Reverse blocking IGBT short-circuit protection circuit, method and system and storage medium | |
| CN1673756A (en) | AC undervoltage detection circuit | |
| CN1881038A (en) | Backlight open circuit protection circuit | |
| CN1073304C (en) | Two-wire power supply electronic switch | |
| US11411488B2 (en) | Method and apparatus for controlling modes of inverter circuit, and inverter | |
| CN105404603B (en) | A kind of anti-interference driving circuit of USB interface | |
| CN202918402U (en) | Circuit reset system of television set | |
| CN2687968Y (en) | Ethernet terminal device for realizing adaptive power supply | |
| CN207265995U (en) | It is a kind of to use the key switch electromechanics road with ena-bung function linear voltage regulator | |
| CN2854885Y (en) | High reliability switch power supply combining system and its output overvoltage protection circuit | |
| CN2777901Y (en) | Electrostatic protection circuit for RF circuit | |
| CN1101015C (en) | Device for preventing surge noise in connecting computers and peripherals thereof | |
| CN2572638Y (en) | Overvoltage protective circuit | |
| CN202474804U (en) | Protective circuit for LNB power-supply short circuit | |
| CN103595286A (en) | Dead-time compensation method and circuit used for bipolar modulation inverter bridge | |
| CN109950877A (en) | A kind of three-phase motor driver overcurrent protective device | |
| CN200959511Y (en) | Circuit with short-circuit protector | |
| CN203504786U (en) | Electromagnetic heating control circuit and electric pressure cooker | |
| CN200962633Y (en) | TV set with the SCART interface level recognition circuit | |
| CN203708369U (en) | Control circuit shared by MHL interface and HDMI interface, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120118 Termination date: 20180413 |