CN200973103Y

CN200973103Y - Modem automatic reset circuit based on MCU investigation

Info

Publication number: CN200973103Y
Application number: CN 200620148008
Authority: CN
Inventors: 刘强
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-20
Filing date: 2006-10-20
Publication date: 2007-11-07
Anticipated expiration: 2016-10-20

Abstract

The utility model discloses a MCU-based modem automatic restoration circuit, which comprises an external interface module and a MCU detection module, wherein the input / output interface of the MCU detection module is connected with the external interface; and the trigger end of the restoration circuit module is connected with the other input / output terminal of the MCU detection circuit. The MCU-based modem automatic restoration circuit module of the utility model provides the solution for the circumstances that data faxing modem is in discontinuous work, the system halting cannot be judged by detection of the serial transmission data, and the automatic restoration is hard for the modem without system halting detection foot.

Description

Modulator-demodulator automatic reset circuit based on the MCU detecting

Technical field

The utility model belongs to a kind of modulator-demodulator automatic reset circuit, especially refers to a kind of modulator-demodulator automatic reset circuit based on the MCU detecting.

Background technology

The application of modulator-demodulator basically now all from before civilian be the main sector application that turns on, and sector application is very high to the stability requirement of modulator-demodulator, high-end modulator-demodulator price height with high stability, the modulator-demodulator poor stability of low side is in long-play, operation inevitably can occur and crash, need reset and just can rework; For sector application can not discontinuity, manual reset is obviously infeasible, therefore various Auto-Sensing deadlock resetting techniques more show important.

At present, the deadlock Auto-Sensing technology that is directed to modulator-demodulator mainly is divided into two kinds: a kind of is detecting serial ports transmission data, finds that free of data then thinks deadlocks, the triggering reset circuit; Another kind is specifically to carry out Auto-Sensing according to the master chip of various modulator-demodulators to crash, and triggers reset circuit again.First kind of scheme, uninterruptedly connect for industry modulator-demodulators such as POS machines, serial ports has transfer of data that effect is just arranged all the time, and connect industry for the modulator-demodulator discontinuous form, as the fax industry, when not faxing, the modulator-demodulator and the other side that gets along well connect, there are not the transmission data in serial ports yet, therefore detects serial ports transmission data and judges deadlock, will not have any use for this industry; Second kind of scheme is limited by master chip, if master chip does not provide the detecting pin that crashes, or relevant feasible program, can't realize Auto-Sensing, and different master chips will design different detecting schemes simultaneously, design loaded down with trivial details, the increase that also brings cost.

The utility model content

The patent technical issues that need to address of the present utility model, i.e. the purpose of this patent is in order to provide the general Auto-Sensing of a cover to crash and automatically reset circuit, the application that promptly can solve different industries can not be limited by the universal circuit of master chip again.

For achieving the above object, the modulator-demodulator automatic reset circuit that the utility model provides based on MCU, comprise one and external interface module, a MCU detecting module, an input/output interface of described MCU detecting module is connected with described external interface, a reset circuit module, its trigger end connects another input/output terminal of MCU circuit for detecting.

Whether modulator-demodulator crashes because the upper layer software (applications) of upper machine installation application of modulation demodulator is perfectly clear, therefore, by the output interface output reseting data of upper layer software (applications) by host computer, described external interface is a device that the level match between host computer and MCU detecting module is provided, the MCU detecting module receives the host computer data after the coupling of external interface, can check at any time whether reset signal is wherein arranged, if comprise reset signal, then send triggering signal to the reset circuit module, triggering is connected the reset circuit module on the modulator-demodulator resetting pin, thereby makes modulator-demodulator reset.

Modulator-demodulator automatic reset circuit module based on MCU of the present utility model is the modem application situation of discontinuous work such as in full reportedly true, can't judge the situation of deadlock by detecting serial ports transmission data, and the automatically reseting of modulator-demodulator that does not possess the detecting pin that crashes provides solution.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a workflow diagram of the present utility model.

Embodiment

With reference to Fig. 1, the Auto-Sensing reset circuit based on modulator-demodulator in the concrete real-time mode of the utility model comprises external interface module 1, MCU detecting module 2, reset circuit module 3.The input of external interface module 1 is by Serial Port Line, and with linking to each other with a serial ports of the host computer that modem application software is installed, output is connected with the control input end of MCU detecting module 2; The output of MCU detecting module 2 can be that a high level output also can be a low level output, and its type is decided on the kind of reset circuit module 3.The input of reset circuit module 3 links to each other with the IO high-low level output pin of MCU, and output links to each other with the reset trigger pin of modulation-demodulation circuit.

Here, external interface module 1 mainly provides calling interface and the standard that upper layer software (applications) need reset, responsible transmission upper layer software (applications) arrives the MCU detecting module by the information of serial ports input, as selects the MAX232 coupling PC of DALLAS company and EIA level and the TTL of MCU for use.

The data that MCU detecting module 2 main responsible filter analysis external interface module pass over are confirmed reset trigger information and are finally provided reset signal to the reset circuit module; Generally comprise a CPU, a memory and an input/output interface, preserve a repositioning information determining program in the memory, its flow process is shown in Fig. 2 part, judge promptly whether serial data information is repositioning information, then provide the high/low level signal that resets in this way, as not being then to abandon processing, and continue detecting at output pin.

Reset circuit module 3 main being responsible for reset to modulation-demodulation circuit, trigger pin by the reset signal that receives MCU detecting module 2, start resetting to modulation-demodulation circuit.Can adopt general RC reset circuit, also can adopt jamproof reset circuit module.

Connection of the present utility model and flow process as shown in Figure 2, external interface module is responsible for EIA (computer terminal) and TTL (MCU end) two-way level converting, transmits the serial data reception IO pin of serial data to MCU, enters the MCU detecting module.After the MCU detecting module is received the data message of external interface module, the embedded program of MCU is carried out filter analysis, useless information is abandoned processing, when belonging to the repositioning information of standard definition, MCU triggers and resets, by one of them IO pin, send the detecting resetting pin of a reset signal (as one section lasting low level) to the reset circuit module, trigger the reset function of reset circuit module; After the reset circuit module is received reset signal,, make it recover normal initialization state to the integral reset that carries out of modulation-demodulation circuit.

Being the utility model preferred embodiment only in sum, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should belong to technology category of the present utility model.

Claims

1. modulator-demodulator automatic reset circuit based on MCU, it is characterized in that: comprise one and external interface module, a MCU detecting module, an input/output interface of described MCU detecting module is connected with described external interface, a reset circuit module, its trigger end connects another input/output terminal of MCU circuit for detecting.