CN201716718U - Single-chip microcomputer detection circuit and device thereof - Google Patents
Single-chip microcomputer detection circuit and device thereof Download PDFInfo
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- CN201716718U CN201716718U CN2009202041532U CN200920204153U CN201716718U CN 201716718 U CN201716718 U CN 201716718U CN 2009202041532 U CN2009202041532 U CN 2009202041532U CN 200920204153 U CN200920204153 U CN 200920204153U CN 201716718 U CN201716718 U CN 201716718U
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Abstract
The utility model provides a single-chip microcomputer detection circuit. The single-chip microcomputer detection circuit comprises a single-chip microcomputer, a resistor, a capacitor, a switch, a first port, a second port and a third port; the single-chip microcomputer comprises a single-chip microcomputer detection port grounded via the resistor and the capacitor in sequence; the first port is connected to an external voltage source; the second port is connected to a node between the capacitor and the resistor; the third port is grounded; the resistor has the function of a current limiting resistor or a discharge resistor; the capacitor is used as a charging and discharging capacitor; the switch adopts a jumper cap or an external switch with similar function; and the single-chip microcomputer detection port can be taken as an input port or an output port. The utility model also provides a device adopting the single-chip microcomputer detection circuit.
Description
Technical field
The utility model relates to a kind of single-chip microcomputer testing circuit, particularly a kind of single-chip microcomputer testing circuit that utilizes the single-chip processor i/o mouth to detect different operate outside states.The utility model also relates to a kind of device that adopts above-mentioned single-chip microcomputer testing circuit.
Background technology
At present, single-chip microcomputer as the major control element widespread usage on domestic electric appliances controller.Fierce day by day and cost of products required reasons such as more and more lower owing to market competition, the multiplexing of multiple function is widely used in the design on the electric control circuit of being in.Yet the operate outside state-detection for the single-chip microcomputer multiplexing functions but lacks corresponding circuit design.
The utility model content
For solving the needs that the prior art single-chip microcomputer detects different operate outside states, be necessary to provide a kind of single-chip microcomputer testing circuit and device thereof that can detect different operate outside states.
A kind of single-chip microcomputer testing circuit comprises a single-chip microcomputer, a resistance, an electric capacity, a switch, one first port, one second port and one the 3rd port.This single-chip microcomputer comprises a single-chip microcomputer detection port.This single-chip microcomputer detection port is successively via this resistance and this capacity earth.This first port is connected to external voltage source.This second port is connected to a node between this electric capacity and this resistance.The 3rd port ground connection.This resistance plays the effect of current-limiting resistance or discharge resistance.This electric capacity is used for as charge and discharge capacitance.This switch is jumper cap or similar functions external switch.This single-chip microcomputer detection port can be used as input port or as output port.
In the utility model single-chip microcomputer testing circuit, have three kinds of different operating states, first kind is that this first port and this second port are by this switch short circuit; Second kind is that this second port and the 3rd port are by this switch short circuit; The third is that this first port, this second port and the 3rd port are and open circuit, and promptly this switch is not connected to this first port, this second port and the 3rd port.
In the utility model single-chip microcomputer testing circuit, this detection port can be arranged to input or output two kinds of working methods.
In the utility model single-chip microcomputer testing circuit, be set to the way of output by this detection port, it is set to input mode behind high level to make its output, just carries out the judgement of external circuit duty according to the level that detects this detections input then.
In the utility model single-chip microcomputer testing circuit, the detection port of this single-chip microcomputer is set to the way of output, and makes its output high level; This single-chip microcomputer detection port is set to input mode, detects the incoming level state; If this moment, this detection port incoming level was a low level, this second port and the 3rd port short circuit; If this detection port incoming level is for being input as high level at this moment, then this single-chip microcomputer detection port is set to the way of output, and is output as low level; This single-chip microcomputer detection port is set to input mode again, detects the incoming level state; If be input as high level this moment, this first port and this second port short circuit; If be input as low level, this second port and the 3rd port are and open circuit.
The utility model also provides a kind of device, and it comprises above-mentioned single-chip microcomputer testing circuit.
Compared to prior art, the utility model utilizes the detection of the existing three kinds of different external status of an I/O cause for gossip of single-chip microcomputer, circuit is simple, software programming is easy to realize, it utilizes the I/O mouth of single-chip microcomputer to be arranged to export different conditions, discharge and recharge control for the I/O outside, change the I/O mouth then and be arranged to input state, judge that incoming level changes, thereby draw the outside whether the connection charge and discharge capacitance is arranged, and draw three kinds of different external status, reduce system cost, and function realizes simple, and circuit performance is reliable.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model single-chip microcomputer testing circuit one preferred implementation.
Embodiment
Below in conjunction with Figure of description the utility model embodiment is specified.
Seeing also Fig. 1, is the electrical block diagram of the utility model single-chip microcomputer testing circuit one preferred implementation.This single-chip microcomputer testing circuit 10 comprises a single-chip microcomputer U1, a resistance R 1, a capacitor C 1, a switch JP, one first port K1, one second port K2 and one the 3rd port K3.This single-chip microcomputer U1 comprises a single-chip microcomputer detection port I/O.
This single-chip microcomputer detection port I/O is successively via this resistance R 1 and this capacitor C 1 ground connection.This first port K1 is connected to external voltage source VDD.This second port K2 is connected to a node between this capacitor C 1 and this resistance R 1.The 3rd port K3 ground connection.
This resistance R 1 plays the effect of current-limiting resistance or discharge resistance.This capacitor C 1 is used for as charge and discharge capacitance.This switch JP is jumper cap or similar functions external switch.This single-chip microcomputer detection port I/O can be used as input port or as output port.
The single-chip microcomputer of described single-chip microcomputer U1 detects a mouthful I/O outside can exist three kinds of different operating states:
First kind is that this first port K1 and this second port K2 are by this switch JP short circuit;
Second kind is that this second port K2 and the 3rd port K3 are by this switch JP short circuit;
The third opens circuit for this first port K1, this second port K2 and the 3rd port K3 are, and promptly this switch JP is not connected to this first port K1, this second port K2 and the 3rd port K3.
The principle of work of this single-chip microcomputer testing circuit 10 is described below:
The detection port I/O of this single-chip microcomputer U1 is set to the way of output, and makes its output high level;
This single-chip microcomputer detection port I/O mouth is set to input mode (resistance value of concrete this resistance R 1 of basis of time, the capacitance of this capacitor C 1 are selected), detects the incoming level state.
If this moment, this detection port I/O incoming level was a low level, show that voltage is low level on this capacitor C 1, then this capacitor C 1 is not recharged when this single-chip microcomputer detection port I/O output high level, shows that promptly external circuit is second kind of state, i.e. this second port K2 and the 3rd port K3 short circuit; If this detection port I/O incoming level then carries out following operation for being input as high level at this moment:
This single-chip microcomputer detection port I/O mouth is set to the way of output, and is output as low level;
This single-chip microcomputer detection port I/O mouth is set to input mode (resistance value of concrete this resistance R 1 of basis of time, the capacitance of this capacitor C 1 are selected) again, detects the incoming level state; If be input as high level this moment, then is first kind of state, i.e. this first port K1 and this second port K2 short circuit; If be input as low level, then be the third state, promptly this first port K1, this second port K2 and the 3rd port K3 are and open circuit.
In the utility model SCM detection device, comprise at least one above-mentioned single-chip microcomputer testing circuit.
Compared to prior art, the utility model single-chip microcomputer testing circuit utilizes the detection port I/O of this single-chip microcomputer U1 to realize the detection of three kinds of different external status, circuit is simple, software programming is easy to realize, its utilization is arranged to output state with this detection port I/O, discharge and recharge for this external circuit, change the input state that is of this single-chip microcomputer detection port I/O then, judge that incoming level changes, thereby draw external circuit whether the connection charge and discharge capacitance is arranged, and draw three kinds of different external status, reduce system cost, and function realizes simple, and circuit performance is reliable.The utility model SCM detection device comprises above-mentioned single-chip microcomputer testing circuit, therefore can realize the detection of three kinds of different external status equally.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (3)
1. single-chip microcomputer testing circuit, it is characterized in that: comprise a single-chip microcomputer, one resistance, one electric capacity, one switch, one first port, one second port and one the 3rd port, this single-chip microcomputer comprises a single-chip microcomputer detection port, this single-chip microcomputer detection port is successively via this resistance and this capacity earth, this first port is connected to external voltage source, this second port is connected to a node between this electric capacity and this resistance, the 3rd port ground connection, this resistance plays the effect of current-limiting resistance or discharge resistance, this electric capacity is used for as charge and discharge capacitance, this switch is jumper cap or similar functions external switch, and this single-chip microcomputer detection port can be used as input port or as output port.
2. single-chip microcomputer testing circuit as claimed in claim 1 is characterized in that: have three kinds of different operating states, first kind is that this first port and this second port are by this switch short circuit; Second kind is that this second port and the 3rd port are by this switch short circuit; The third is that this first port, this second port and the 3rd port are and open circuit, and promptly this switch is not connected to this first port, this second port and the 3rd port.
3. a device is characterized in that: comprise the single-chip microcomputer testing circuit described in aforesaid right requirement 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202041532U CN201716718U (en) | 2009-08-28 | 2009-08-28 | Single-chip microcomputer detection circuit and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202041532U CN201716718U (en) | 2009-08-28 | 2009-08-28 | Single-chip microcomputer detection circuit and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201716718U true CN201716718U (en) | 2011-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202041532U Expired - Fee Related CN201716718U (en) | 2009-08-28 | 2009-08-28 | Single-chip microcomputer detection circuit and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201716718U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544408A (en) * | 2012-02-27 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Battery box and mobile phone charging and discharging measurement system |
| CN104407954A (en) * | 2014-11-24 | 2015-03-11 | 深圳市振邦智能科技有限公司 | Method for detecting I/O (input/output) interface faults in MCU (microprogrammed control unit) |
| WO2019011037A1 (en) * | 2017-07-10 | 2019-01-17 | 比亚迪股份有限公司 | Fault detection method and device for train controller input circuit |
-
2009
- 2009-08-28 CN CN2009202041532U patent/CN201716718U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544408A (en) * | 2012-02-27 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Battery box and mobile phone charging and discharging measurement system |
| CN104407954A (en) * | 2014-11-24 | 2015-03-11 | 深圳市振邦智能科技有限公司 | Method for detecting I/O (input/output) interface faults in MCU (microprogrammed control unit) |
| WO2019011037A1 (en) * | 2017-07-10 | 2019-01-17 | 比亚迪股份有限公司 | Fault detection method and device for train controller input circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20170828 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |