CN2741296Y - TV-set core operating mode indicating circuit - Google Patents

Abstract

The utility model discloses a TV-set core operating mode indicating circuit, which is communicated with the FLASH register of an external hanging interrupt program via the CPU of a TV-set core board, and when the interrupt instructions are sent from external via a remote controller or press keys, the register of the chip can be modified or read. Simultaneously, the I/O port of the CPU drives two seven-segment LED nixie tubes to display via two rising edge triggers, the display status of the LED nixie tube is used for indicating the working mode of the current signal board, and then the modification of the register and the judgment of a fault circuit are carried out, which helps the technicians find out the problems quickly and shortens the development and debugging time effectively. The driver circuit of the utility model is simple in design, which solves the problem that the complex circuit board is difficult to be stepped in when an error occurs.

Description

Core of TV set operating state indicating circuit

Technical field

The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of indicating circuit of Core of TV set operating state.

Background technology

At present, the application of LED charactron is very extensive, much all be to be used for demonstration time or counting etc., but in the development process of television set, its application is rarely found.And we are now when debugging Core of TV set plate, what often occurred not knowing to start with after the problem from, can only check one by one according to signal flow by adopting conventional methods such as test voltage or measured waveform, though the method is effective, but process complexity, many unnecessary links can't be avoided, and therefore, have wasted technical staff's development time greatly.

Summary of the invention

The utility model is in order to overcome the step complexity that available technology adopting traditional technique in measuring Core of TV set circuit is brought, the deficiency that wastes time and energy, a kind of indicating circuit of Core of TV set operating state is provided, this circuit utilizes the show state of LED charactron to indicate the operating state of current demand signal plate, and then the guidance technology personnel carry out the modification of register and the judgement of faulty circuit.

For solving the problems of the technologies described above, the utility model is achieved by the following technical programs:

A kind of Core of TV set operating state indicating circuit comprises CPU, and described CPU links to each other with a FLASH register, by with the communication of FLASH register, read the drives interrupts program of its storage inside; The I/O mouth of described CPU shows by trigger actuation LED charactron.

As the further qualification to technique scheme, 16 data I/O mouths of described CPU link to each other with the input that trigger 74LV574 is prolonged in two risings respectively, and its output drives two 7 sections LED charactrons respectively.

Compared with prior art, advantage of the present utility model and good effect are: the FLASH register of CPU of the present utility model and plug-in interrupt routine carries out communication, when the external world sends interrupt instruction by remote controller or button, can realize the modification of register in the chip and read.Simultaneously, the I/O mouth of CPU prolongs trigger by two risings and comes the driving LED charactron, utilize the show state of LED charactron to indicate the operating state of current demand signal plate, thereby carry out the modification of register and the judgement of faulty circuit, help the technical staff to find the problem as soon as possible, shorten the time of exploitation debugging.

Description of drawings

Fig. 1 is the indicating circuit connection layout that shows the Core of TV set operating state in the utility model by the LED charactron;

Fig. 2 is the truth table of trigger in the utility model.

Embodiment

The utility model is described in more detail below in conjunction with the drawings and specific embodiments.

When circuit working, the FLASH register of CPU and plug-in program carries out communication, by writing the drives interrupts program in the FLASH register, when sending interrupt instruction in the external world by remote controller or button, just can realize the modification of register in the chip and reads.Simultaneously, CPU controls the LED charactron by the high-low level of its data I/O mouth and shows, and then realizes the indication to the work at present state, and its physical circuit connection layout is referring to shown in Figure 1.

Among Fig. 1, the I/O communication data HA0～HA15 that sends CPU to FLASH passes to two risings respectively and prolongs trigger U6, U9, wherein, data input pin D1～D8 of trigger U6 receives data HA0～HA7 respectively, its output Q1～Q7 links to each other with 7 sections LED charactron VCC21 respectively, drives its demonstration; Data input pin D1～D8 of trigger U9 receives data HA8～HA15 respectively, and output Q1～Q7 drives 7 sections LED charactron VCC11 and shows.It is the flip chip realization of 74LV574 that described trigger U6, U9 all adopt model, and its sheet choosing end OC is ground connection all the time, and rising is prolonged trigger end CP and linked to each other with clock end CLOCK.

Fig. 2 is the truth table of trigger 74LV574 in the utility model, when the program loading is finished, should show "---" that at this moment, the D7 pin of trigger U6, U9 is a low level, according to truth table, output Q7 is a low level, and then 1g, the 2g of two common positive 7 sections LED charactron VCC11, VCC21 end is low level, the corresponding horizontal led lighting in centre, and then two horizontal stripes in the middle of being shown as, other displaying principles are identical.According to the show state of LED charactron VCC11, VCC21, can analyze the operating state of each several part circuit fast, thereby carry out the modification of register and the diagnosis of faulty circuit.

Its course of work is: after the power supply energising, LED charactron VCC11, VCC21 shows " L-", the expression data load, show that then " LA " represents to have loaded emission information, this shows that the front-end processing receiving chip is working properly, show " SE " thereafter, represent that this chip connects with its decoding chip, if LED charactron VCC11, VCC21 shows that " SE " state is constant, the via intermedia that shows front-end processing receiving chip and decoding chip go wrong or decoding chip work undesired, should check the decoding chip peripheral circuits by emphasis this moment.If LED charactron VCC11, VCC21 show " RA ", show that then decoding chip is working properly, decoded signal has outputed in the display output circuit of rear end.Show that then "---" shows signal normally output, waits for operation next time.If want to switch to S-VIDEO, can select the S-VIDEO key of remote controller, this moment is not if there is the LED charactron, then can't know the current S-VIDEO passage output that whether switched to intuitively, charactron shows " S-" and only need watch now, can show to have switched to this passage, signal is exported.If wonder whether switch to AV1, watch charactron VCC11, VCC21 whether to show " A1 ", if do not show that " A1 " shows that then passage has problem, need this moment to check the AV1 passage, look at that software register is provided with the aspect whether problem or the like is arranged.

The utility model has been realized the indication of LED charactron to the Core of TV set operating state by adopting above-mentioned simple circuit configuration, has solved the problem that is difficult to start with when breaking down for complex circuit board well.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims (3)

1. a Core of TV set operating state indicating circuit comprises CPU, it is characterized in that: described CPU links to each other with a FLASH register, by with the communication of FLASH register, read the drives interrupts program of its storage inside; The I/O mouth of described CPU shows by trigger actuation LED charactron.

2. Core of TV set operating state indicating circuit according to claim 1 is characterized in that: 16 data I/O mouths of described CPU link to each other with the input that trigger is prolonged in two risings respectively, and its output drives two 7 sections LED charactrons respectively.

3. Core of TV set operating state indicating circuit according to claim 2 is characterized in that: the model of described trigger is 74LV574.

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