KR0119588Y1 - One-chip back-up micom - Google Patents

Abstract

The present invention relates to a back up MICOM that can be implemented as a one chip, and two microcomputers to back up data according to the superimpose function, OSD text data, and time data on the camcorder (CAMCORDER). It is designed to perform a backup function with one micom by checking the voltage applied from the outside through the battery detector to operate by selecting the mode of the microcomputer. By using one micom as a backup function, the device configuration is simplified and economical efficiency is provided.

Description

One-chip backup microcom

1 is a block diagram showing a backup apparatus using a conventional microcomputer.

Figure 2 is a block diagram showing a backup microcom capable of one-chip implementation according to the present invention.

3 is a power waveform diagram input to each component of FIG.

* Explanation of symbols for main parts of the drawings

21: battery detection unit 22: power supply switching unit

23: reset control unit 24: microcomputer

25: SRAM 26: OSD Block

The present invention relates to a backup microcom capable of implementing one chip.

In general, a separate backup dedicated IC is used in a backup system of a camcorder. A block diagram of such a conventional backup device using a microcomputer is shown in FIG. The apparatus of FIG. 1 receives the power supply V _MAIN necessary for the operation of the main microcomputer from the outside, and controls the first reset controller 11 to be in an initial state before performing the main operation of the microcomputer, and the main power supply V. FIG. _The main microcomputer 12 which receives the reset signal RST ₁ from the _MAIN ) and the reset control unit 11 and controls each component so that the camcorder performs its original function, the main power supply V _MAIN , and an external device. Receives the power supply (V _BU ) necessary for the operation of the backup microcom from the power supply switching unit 13 to control the function of the microcomputer and the power applied from the power switching unit 13 to check the reset signal (RST ₂₎ Backup mode V _BU is supplied through the second reset controller 14 and the power switching unit 13 to generate the backup mode signal, and the backup mode signal corresponding to the low state from the main microcomputer 12 is generated. Backup microcom (15) and the backup microcom (15) in the (V _BU ) to perform a backup function The SRAM 16 receives and restores the superimposed data DATA stored in the superimposed IC (not shown), and stores the character data (D _OSD ) input through the main microcomputer 12. It consists of an OSD block 17 for displaying the character data (D _{OSD '} ) applied from the backup microcomputer 12 on the screen.

In FIG. 1, the data required for the backup function of the camcorder includes data according to the super impose function, OSD text data, and clock data indicating the time. . Therefore, the camcorder needs a separate main battery and a back up battery. The first reset controller 11 receives a main power source V _{MIUN '} from the outside and generates a reset signal RST ₁ for initializing the main microcomputer 12 to operate in the main mode. The main microcomputer 12 receives the main power supply V _MIN and receives the reset signal RST ₁ through the first reset control unit 11 to become an initial state for performing a main function. Here, 5V is used as the main power supply (V _MIN ), and the main function is provided with a function for controlling each component necessary for performing a camcorder operation. The main power supply V _MIN of 5 V is also supplied to the power supply switching unit 13 and applied to the power input terminal V _DD2 of the backup microcomputer 15. The main microcomputer 12 performs the original function while the main power supply V _MIN of 5 V is applied, and applies the text data D _OSD to the backup microcomputer 15. The backup microcomputer 15 stores the text data D _OSD applied through the main microcom 12 while the main power of 5V is applied through the power switch 13. While the 5V main power supply V _MAIN is supplied to the main microcomputer 12, the high signal M _BU is applied to the backup microcomputer 15 to indicate that the current state is the main mode. When the main power V _MAIN of 5 V is not supplied, the main microcomputer 12 recognizes the low-state signal M _BU , that is, the signal indicating the backup mode, by the backup microcomputer 15. The backup micom 15 supplies a backup power V _BU corresponding to 3V from the outside, and performs a backup function when a signal indicating the main mode is not applied from the main microcom 12. The backup micom 15 extracts the superimpose data DATA and backs it up to the SRAM 16. In addition, the text data (D _OSD ) received through the main microcom 12 is applied to the OSD block 17 from the backup microcom 15 so that the text can be displayed on the screen. As such, a separate backup microcom is required to back up data that requires digital processing such as superimpose data, OSD text data, and time display data used in the camcorder. There was a problem letting.

Accordingly, an object of the present invention is to provide a microcomputer capable of implementing a one-chip that can be performed by switching the main function and the backup function to each other to solve the above problems.

The object of the present invention is to provide a backup function for preventing data loss, the battery detection unit for checking the presence of a predetermined power source and generates a binary signal in response thereto, different input from the outside A power switching unit for switching the first lamp power or the second driving power having a voltage value according to an operator's selection signal, a reset control unit for checking the edge portion of the power applied from the power switching unit and setting the micom; The microcomputer operating in the main mode in response to the first signal among the binary signals applied from the battery detection unit, and operating in the backup mode in response to the second signal, and means for receiving and storing backup data from the backup mode micom. Is achieved.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a block diagram showing a backup microcom capable of one-chip implementation according to the present invention. The apparatus of FIG. 2 includes a battery detector 21 which checks whether or not a 5V main power supply V _{MaIN '} is input from the outside and generates a mode signal S _{MOD in} response thereto, and the main power supply V _MaIN'. ) Or the power supply switching unit 22 and the power applied from the power switching unit 22 are generated by applying the backup power supply V _{BU '} and generate the corresponding register signal RST. The control unit 23 is switched to the corresponding mode according to the mode signal S _MOD applied from the battery detector 21 and the battery detector 21, and the driving power supplied through the power switch 22 is applied to the corresponding mode. The microcomputer 24 performing the operation, the SRAM 25 for backing up and storing the backup data stored in the microcomputer 24 in the backup mode, and receiving the text data from the microcomputer for display on the screen. OSD block 26 is configured.

The description of FIG. 2 will be described with reference to FIG. 3. 3 is a power waveform diagram applied to each component of FIG. FIG. 3 (a) shows the case where 3V power corresponding to the backup power supply (V _{BU '} ) is inputted from the outside, and (b) shows 5V power corresponding to the main power supply (V _MAIN' ). 3V input corresponding to the backup power supply (V _{BU '} ) while being supplied to each component. In FIG. 2, when 5 V power corresponding to the main power supply V _{MAIN ′ is} supplied to the battery detector 21 and the power switch 22 from the outside, the battery detector 21 is in a high state. The signal S _MOD is applied to the microcomputer 24. The microcomputer 24 recognizes the signal S _MOD of the high state of the battery detector 21 and operates in the main mode. The power supply switching unit 22 supplies a 5V main power supply V _MAIN to the power input terminal V _DD and the reset control 23 of the microcomputer 24. The reset controller 23 generates a reset signal RST for checking the edge portion of the power applied from the power switch 22 and resetting the micom 24 according to the corresponding mode of the micom 24. Before performing the operation according to the initialization. The microcomputer 24 performs the original main function in the main mode. At this time, when the 5V power is disconnected from the outside by the user and is switched to the backup power supply (V _BU ) for the backup performance (in case of FIG. Therefore, the low signal S _MOD is applied to the microcomputer 24 to switch the microcomputer 24 to the backup mode. The power supply switching unit 22 applies the backup power supply V _{BU ′} 3V required for the backup operation to the microcomputer 24 and also applies it to the reset control unit 23. The reset controller 23 generates a reset signal RST for initializing the microcomputer 24 to stop the main function of the microcomputer 24 and recognize the backup function. The microcomputer 24 switches to the backup mode according to the low signal S _MOD corresponding to the backup mode applied from the battery detector 21 and stores the backup data stored in the predetermined location. Is stored in the corresponding SRAM 25, and the character data is stored in the OSD block 26 so that it can be displayed on the screen at any time. In addition, the microcomputer 24 is supplied with a lithium battery (LIPE) having a built-in backup power supply (V _{BU '} ) input to the power switching unit 22 to charge the backup function even if an emergency situation in which the power is interrupted. This should be done completely. The foregoing may be briefly shown in Table 1 below.

Here, the microcomputer 24 is switched to the corresponding mode in response to the output signal S of the battery detector 21. The driving power V of the microcomputer 24 that enters through the power switching unit 22 often fails to obtain an accurate value due to power loss, which causes the microcomputer 24 to malfunction. Under control.

As described above, the present invention has the effect of providing a simple and spherical advantage in terms of economics to solve the price problem and the complexity in system realization by implementing a one-chip microcomputer with a backup function in the camcorder. Furthermore, it can be extended to not only camcorders but also backup functions of devices such as Compact Discs.

Claims (5)

An apparatus for performing a backup function to prevent data loss, the apparatus comprising: a battery detector for generating a binary signal in response to a check of a preset power supply; A power switching unit for switching the first driving power or the second driving power having different voltage values input from the outside according to the operator's selection signal; A reset control unit for resetting the microcomputer by checking a power edge portion applied from the power switching unit; A microcomputer operating in a backup mode in response to a first signal among binary signals applied from the battery detector and operating in a backup mode in response to a second signal; And a means for receiving and storing backup data from the microcomputer in the baekham mode. The backup microcom according to claim 1, wherein the microcomputer further comprises means for charging by receiving a second driving power input to the power switching unit. The backup microcom according to claim 1, wherein the binary signal generates a first signal while a preset power is input from the outside, and generates a second signal during the remaining sections. The backup microcom according to claim 1, wherein the backup data storing means includes an OSD block for receiving text data from the micom in the backup mode and displaying the text data on the screen. [5] The one-chip implementation as claimed in claim 4, wherein the backup data storage means further includes a means for backing up data or time indicating data according to a superimpose function from the mimecom in the backup mode. Backup MyCom.