JPH0281256A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To display a function of the same degree without using a microcomputer having a ROM and a RAM of large capacity by processing the contents which cannot be processed completely by a first microcomputer, by a second microcomputer. CONSTITUTION:Address data, and RAM data are transferred from a serial transfer part 34 to a serial receiving part 40, when a load signal generated in a first microcomputer 3 is 'L', and when the signal is 'H', respectively. The transferred data are written successively in a second RAM 41, therefore, a second RAM 41 comes to have the same information as that of a first RAM 33. In a second ROM 42, a program being different from that of a first ROM 32 is stored, and a character generating IC 5 of the outside is controlled from a display processing part 43. In such a way, the whole screen on-screen display which cannot be expressed by only a first microcomputer 3 can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to electronic equipment using a microcomputer, such as a television receiver.

(b) Prior Art FIG. 2 is a block diagram of a television receiver that uses a one-chip microcomputer (hereinafter referred to as microcomputer) for on-screen display.

If there is human power on the operating keys of a remote control transmitter (not shown), etc., the key human power determination unit (10) in the microcomputer (1)
After the determination, the key processing unit (111) processes the key processing unit (111), and the display processing unit (12) further processes the on-screen display on the cathode ray tube (2). This is described in Japanese Patent Application No. 62-325045, which was previously filed by the applicant.

The on-screen function of the one-chip microcomputer (1) is usually not very sophisticated and typically has a display capacity of 3 to 6 lines. There is also a ROM (1
3) and the capacity of the RAM (14) for storing data is also limited; 1) it is difficult to use this microcomputer to perform on-screen display with higher specifications than the current one.

Therefore, in such a case, it is necessary to select a microcomputer with large ROM and RAM capacity and design the program from the beginning, making it difficult to cope with the high-mix, low-volume production of electronic equipment.

1c) Problems to be Solved by the Invention The present invention provides an electronic device that uses a microcomputer equipped with ROM and RAM on the same level as conventional devices and can exhibit multiple functions that are far superior to those currently available. (2) Means for Solving the Problems The present invention provides an electronic device whose operation is controlled by a microcomputer, which includes a first ROM that stores a first program, and a first process that performs a predetermined process according to the first program. a first microcomputer comprising a first RAM that stores data processed by the first processing section; and a transfer section that transfers the data in the first RAM to the outside; a second ROM that stores a second program; It consists of a receiving section that receives data transferred from the transfer section, a second RAM that stores the data received by the receiving section, and a second processing section that performs predetermined processing according to the second program and the data in the second RAM. A second microcomputer (e) Function The present invention transfers data processed by the first microcomputer to a second microcomputer, and uses the output of the second processing section of the second microcomputer as a control output.

(f) Examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention, and (3) is a first microcomputer, which is a key power determination unit (30) that receives key power and determines the type.
, a key processing unit (31) that performs processing according to key human power;
1st ROM where the 1st program is stored +3
21. Key processing unit (31) where various data are stored.
The first RAM (
33) and a serial transfer section (34) that transfers the data of this first RAM (33) to the outside.

(4) is a second microcomputer, and the serial transfer section (3
4) Serial receiving unit (
40), a second RAM (41) in which data received by the serial receiving unit (40) is stored; 2ROM<42), and the second R
It is composed of a display processing section (43) that is controlled based on the data in the AM (41) and the program in the second ROM (42).

(5) is a character generation IC that is controlled by the output of the display processing section (43) and generates a predetermined pattern character signal;
This output is superimposed on a television signal (not shown) and applied to a cathode ray tube (2).

The first program controls the key manual determination section (30), the key processing section (31), and the serial transfer section (34), and the second program controls the serial reception section (40) and the display control section (43). This is a program that controls the

Next, the operations of the first and second microcomputers described above will be explained.

FIG. 3 shows a RAM address map of the first RAM (33), and FIG. 4 shows an output timing chart of RAM data. Then, when the load signal generated in the first microcomputer (3) is "L", the address data is "H", it is R.
Each AM data is transferred from the serial transfer section (34) to the serial reception section (40).

First, the address data of address 1 during the first "L" period is transferred. Address 1 specifies RAM (1,0) to (1°F) at the top of the RAM address map.

Next, during the load signal “H” period, RAM (1, 0)
(1,1), RAM (1,2) (1°3)...RAM
Transfer data of (1, E) (1, F). In a similar manner, addresses 2, 3, . . . and all RAM data are transferred.

The transferred data is written to the 2RAM (41) as soon as possible, so the 2nd RAM + 41) is written to the 1st RAM (33).
will have the same information.

The second ROM (42) stores a different refogram from the first RAM f32), and by controlling the external character generation IC (5) from the display processing unit (43), the first
It becomes possible to perform full-screen on-screen display, which was not possible with the microcomputer (3) alone.

In addition to serial transfer, parallel 4-bit or 8-bit transfer is also possible as a data transfer method.

It can be applied to microcomputers in multi-function TVs such as TVs, text multiplex TVs, and IDTVs.

(G) Effects of the Invention As described above, according to the present invention, contents that cannot be processed by the first microcomputer are processed by the second microcomputer.
The same level of functionality can be achieved without using a microcomputer with a large RAM capacity.

Therefore, it is possible to develop products easily and in a short period of time without making major changes to the software design, and it is possible to smoothly respond to high-mix, low-volume production.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a microcomputer of a television receiver according to an embodiment of the present invention, FIG. 2 is a diagram showing a RAM address map, FIG. 3 is a diagram showing output timing of RAM data, and FIG. 4 is a diagram showing a RAM data output timing. 1 is a block diagram of a microcomputer of a conventional television receiver. (3)...First microcomputer, (30)...Key human power determination section, (31>...Key processing section, <321
=-1st ROM, (33)...1st RAM, (34
)...Serial transfer section, (4)...Second microcomputer,
(40) Serial receiver, -- CRT,

Claims (1)

[Claims] (1) An electronic device whose operation is controlled by a microcomputer includes a first ROM that stores a first program, a first processing section that performs predetermined processing according to the first program, and processing performed by the first processing section. a first microcomputer comprising a first RAM for storing the data stored in the first RAM; a transfer unit for transferring the data in the first RAM to the outside; a second RAM for storing a second program; and a second RAM for receiving the data transferred from the transfer unit. a second microcomputer consisting of a receiving section that receives data, a second RAM that stores data received by the receiving section, and a second processing section that performs predetermined processing according to the second program and the data of the second RAM; An electronic device characterized in that the output of the second processing section is a control output.