KR100227308B1 - Device and method being capable of programming in mpu board - Google Patents

Abstract

The present invention relates to an apparatus and method that can be programmed in an MPU board to change or debug a program. The present invention relates to an MPU for controlling operations on various functions installed in an external front of a set-top box, an operation mode or a program mode. A buffer unit for releasing or connecting the output of data upon application, an address decoder for connecting or releasing the data buffer unit and the address buffer unit, a main CPU for controlling the entire system, and serial data transmitted from the main CPU. It consists of a serial communication controller, a modem to demodulate and demodulate, and an RS232C driver so that the program can be easily written without a separate device.

Description

Programmable Devices and Methods on the MPU Board

The present invention relates to an MPU (MAIN PROCESSOR UNIT) board used in a set top box, and in particular, when changing or debugging a program through a modem or an RS232C driver, it is easy to read / decode without additional devices. The present invention relates to a programmable device and a method for writing to an MPU board.

Conventionally, if program data is written to the MPU during the development of a multimedia product applied to the system, and the contents of the program are used in the version-up (VERSION-UP) to erase the already written data, a predetermined tool In other words, the use of a ROM writer (ROM WRITER), so there was an inconvenience to take off the cover of the product to change the MPU.

In addition, there is a problem in that data cannot be easily debugged because the program data inside the set top box cannot be changed at a long distance.

An object of the present invention is to solve the above-mentioned conventional problems, the present invention can download the data from an external terminal or host computer directly to write or erase the program code stored in the MPU, the external The purpose of the present invention is to provide a programmable device and method in an MPU board that can download data from a long distance by using a PSTN (PUBLIC SWITCHED TELEPHONE NETWORK) network.

Programmable device in the MPU board of the present invention for achieving the above object, the MPU for controlling the operation of the various functions installed in the front (FRONT) of the set-top box, and receives the data output from the MPU And a buffer unit for releasing or connecting the output of the data according to the operation mode or the program mode, and controlling the data buffer unit and the address buffer unit according to the operation mode or the program mode to control the data buffer unit and the address buffer unit. An address decoder to connect or disconnect, a main CPU to control the entire system, a serial communication controller connected to the main CPU to control serial data transmitted from the main CPU, and a serial data transmitted from a Sykes serial communication controller. Or demodulate data from an external PSTN telephone network. Seen to receive or transmit data to the PSTN telephone network and modem, consist of RS232C driver for inputting and outputting data.

In addition, the programmable method in the MPU board of the present invention, when a command to write a program through the RS232C driver or modem is input, it is determined whether the instruction is intended by the MPU command is not the instruction intended by the MPU In this case, a first step S1 of performing an operation mode, a second step S2 of determining a command in the first step S1, and outputting a control signal if it is determined that the command is correct, and the second step. The third step S3 in which 1 byte of data is written to the MPU by the control signal output in step S2, and whether the instruction or data continues after the data is written in the third step S3 is continued. If it is determined that there is data, the fourth step (S4) to perform the second step (S2), and if it is determined that there is no data and instructions continued in the fourth step (S4) operation mode Execute it characterized by comprising a fifth step (S5) of performing a normal operation.

1 is a block diagram schematically showing the present invention,

2 is a state in the program mode for the MPU of the present invention,

3 is a flowchart showing a case in the program mode.

* Explanation of symbols for main parts of the drawings

10: MPU 20: data buffer unit

21: buffer section 30: address buffer section

40: power supply selection section 50: address decoder

60: main CPU 70: serial communication controller

80: modem 90: RS232C driver

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment according to the technical idea of the present invention "apparatus and method programmable in the MCU board" in detail as follows.

As shown in FIG. 1, the MPU 10 is an 8-bit single chip for controlling operations on various functions installed in an external front of a set-top box. In the related art, the MPU 10 cannot be erased and written again once written. EPROM was used, but in the present invention, a flash ROM that can be written and erased many times was used. 8 bits of data are inputted and outputted at the P0.0 to P0.7 ports, and 12-bit addresses are outputted at the P2.0 to P2.7 and P1.0 to P1.3 ports.

The oscillator 11 is applied to X1 and X2 to generate a clock, and the power supply (Vcc) is connected to the RST terminal to supply 5V power, and Tx / Rx is a transmission / reception terminal for transmitting and receiving data, ALE / PROG and EA. The / Vpp terminal is, for example, connected to a power supply selector 40 which controls 5V in the operation mode for normal operation and 12V in the program mode for inputting data.

The data buffer unit 20 receives 8-bit data output from the MPU 10, and releases or connects the output of the data depending on whether the operation mode or the program mode is used.

In addition, the address buffer 30 receives the 12-bit address output from the MPU 10, and releases or connects the output of the address depending on whether the operation mode or the program mode is used.

The address decoder 50 controls the data buffer unit 20 and the address buffer unit 30 by outputting an address in accordance with the operation mode or the program mode to control the data buffer unit 20 and the address buffer unit 30. ) Is connected or disconnected, and the power applied to the MPU 10 is selected as 5V or 12V depending on whether the operation mode or the program mode is used.

The main CPU 60 is connected to the 8-bit data and 12-bit address of the MPU 10, and is connected to the MPU 10 to transmit and receive through an external modem 80 or RS232C driver 90 to thereby transmit the entire system. To control.

The serial communication controller 70 is connected to Tx / Rx of the main CPU 60 to control serial data transmitted from the main CPU 60.

Data input from the outside can be downloaded (DOWN LOADING) the program of the MPU 10 to the set-top box of each user through the PSTN telephone line, and can also be input through the RS232C driver 90, If the CAS (CHARGING AND ACCOUNTING SUBSYSTEM) standard is applied to the set-top box, it can function as a PAY PER VIEW with a SMART CARD, where the modem 80 is connected from the serial communication controller 70. Modulates or demodulates the transmitted serial data to receive or transmit data from an external PSTN telephone network.

The RS232C driver 90 is for inputting and outputting data to the set-top box, which is a satellite receiver. In particular, the RS232C driver 90 checks the operating state of the set-top box during debugging or after-sales service.

FIG. 2 is a table showing states in the program mode for the MPU 10 of the present invention. For example, when the MPU 10 is write code data, RST is high. If / PSTN is low and the power supply EA / Vpp is input 12V, low for P2.6, high for P2.7, high for P3.6, and high for P3.7, ALE / PROG The low edge trigger pulse is output at. After about 10 msec, 1 byte of data is written to the MPU 10.

Referring to the operation, effects of the present invention configured as described above are as follows.

First, if, for example, a command to write a program is input to the MPU 10 through the RS232C driver 90 or the modem 80, the MPU 10 determines whether such a command is the command intended by the MPU 10. If it is determined that the instruction is not the instruction intended by the MPU 10, the operation mode is immediately performed to perform a normal operation.

By the way, if the command inputted through the modem 80 and the RS232C driver 90 is the intended command, 12V power is applied to the MPU 10 under the control of the address decoder 50, and a serial communication controller ( 70) serial data is controlled.

Then, the data and address of the main CPU 60 are applied to the buffer unit 21, and under the control of the address decoder 50, the data buffer unit 20 and the address buffer unit 30 of the buffer unit 21 are controlled. ) Is connected by the program mode so that data input from the outside is written to the MPU 10.

Referring to the case of the program mode with reference to the flowchart of the present invention shown in Figure 3 as follows.

First, in the first step S1, when a command to write a program is input through the RS232C driver 90 or the modem 80, the MPU 10 determines whether the command is intended by the MPU 10, If the instruction is not the instruction intended by the MPU 10, the operation mode of the normal operation, which is the fifth step (S5), is immediately performed. In the second step (S2), the instruction is performed in the first step (S1). If it is determined that the instruction is correct, the buffer unit 21 is connected to the program mode under the control of the address decoder 50, and accordingly, 12 V power is applied to the MPU 10.

Accordingly, in the MPU 10, RST is HIGH, PSEN is LOW, 12V is input for EA / Vpp, low for P2.6, high for P2.7, high for P3.6, When P3.7 is input high, a low edge trigger pulse is output from ALE / PROG. Here, only the case of the light is described as an example, but the case of the lead operates in the same principle as the case of the light.

When the low edge is outputted in the second step ALE / PROG, in the third step S3, after about 10 msec, 1 byte of data is written to the MPU 10 and delayed for a predetermined time in the third step S3. When the data is output, it is determined whether there is a command or data that is continued in the fourth step (S4), and when it is determined that there is data that is continued, the second step (S2) is performed. Execute the operation mode of) to perform normal operation.

The present invention relates to a programmable device and method in the MPU board configured as described above, when installing a flash ROM inside the MPU to change or debug the program through an external modem or RS232C driver and without additional devices It is easy to read / write.

Claims (7)

An MPU for controlling operations on various functions installed in the front of the set-top box, and receiving data output from the MPU, and releasing or connecting data output depending on whether it is operated mode or program mode. A buffer unit, an address decoder for connecting or releasing the data buffer unit and the address buffer unit by controlling the data buffer unit and the address buffer unit in accordance with the operation mode or the program mode, a main CPU for controlling the entire system, and the main unit A serial communication controller connected to a CPU to control serial data transmitted from the main CPU, and receiving or receiving data from an external PSTN telephone network by modulating or demodulating the serial data transmitted from the serial communication controller, or transmitting data to a PSTN telephone network. Modem to input / output data Programmable device MPU in the board, characterized in that consists of the RS232C drivers. The apparatus of claim 1, wherein the buffer unit comprises a data buffer unit for buffering data and an address buffer unit for buffering an address. The MPU board of claim 1, wherein the buffer unit releases the data buffer unit and the address buffer unit in the operation mode, and connects the data buffer unit and the address buffer unit in the program mode. Device. The apparatus of claim 1, wherein the address decoder controls 5V to be input to the MPU in an operation mode and 12V to be input in a program mode. When a command to write a program is input through an RS232C driver or a modem, a first step of determining whether the instruction is the intended instruction in the MPU and performing an operation mode when the instruction is not the intended instruction in the MPU ( S1), the second step S2 of outputting a control signal from the address decoder when the command is determined to be correct in the first step S1 and the command decoder is determined, and the control signal output in the second step S2. By the third step (S3) is written one byte of data to the MPU and by the third step (S3) is determined whether there is a command or data that continues after the data is written in the second step (S3) If it is determined that there is no data and command that is continued in the fourth step S4 of performing the step S2 and the fourth step S4, the operation mode is executed to perform normal operation. The program for a possible MPU board, characterized in that comprising the step 5 (S5) to perform. The method of claim 5, wherein the second step (S2) is a command to write, the first step (S1) determines the command input from the modem and RS232C driver, and if it is determined that the command is correct to control the address decoder. And a buffer unit is connected in accordance with a program mode to apply a power of 12V to the MPU. The method of claim 5, wherein when the command to write in the second step (S2), RST is high in the MPU, / PSEN is low, 12V is input in EA / Vpp, low in P2.6, P2. 7. A high edge trigger pulse is output from ALE / PROG when high is input to 7, high is input to P3.6 and high is input to P3.7.

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