JP2767794B2 - Microcomputer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer suitably applied to, for example, a television receiver having a built-in nonvolatile memory for storing channel preset data. SUMMARY OF THE INVENTION The present invention relates to a microcomputer in which preset data of an electronic device such as channel preset data of a television receiver is written in a memory such as a built-in nonvolatile memory. When the write processing unit determines that an access operation is being performed based on a signal obtained from the outside, a predetermined terminal is used as a data input terminal for the memory access, so that the memory in the microcomputer can be easily stored in the memory. It is designed so that preset data can be written. 2. Description of the Related Art Conventionally, as a nonvolatile memory for storing channel preset data and the like of a television receiver, there is a nonvolatile memory incorporated in a microcomputer (Japanese Patent Application Laid-Open No. 62-94011). . The use of this kind of microcomputer has the advantage that various devices such as a television receiver can be assembled with a smaller number of parts compared to a case where the memory is a separate part as a single unit. [Problems to be Solved by the Invention] However, when the nonvolatile memory is incorporated in the microcomputer as described above, when writing data to the nonvolatile memory, the microcomputer is connected to a television receiver or the like. In order to operate this microcomputer by incorporating it in the device, there is a disadvantage that it takes time and effort to write data. That is, for example, in the case of a non-volatile memory that stores channel preset data of a television receiver, the television receiver is assembled and a channel selection button is attached,
Unless the final state of the receiver is completed, the channel data cannot be written to the memory, that is, the channel preset cannot be performed. For this reason, at the time of manufacturing this television receiver, it is necessary for the operator to perform this channel preset using a tuning button, a tuning button, and the like, and there has been a problem that the channel preset is extremely troublesome. In particular, this channel preset requires a plurality of channels to be preset by one receiver, and requires a great deal of labor and time. In view of the above, an object of the present invention is to provide a microcomputer of this type that can easily write data. [Means for Solving the Problems] In the microcomputer of the present invention, as shown in FIG. 1, for example, preset data of a predetermined function of an electronic device is written in a built-in nonvolatile memory (3), In a microcomputer (1) for controlling a predetermined function of an electronic device according to stored preset data, a microcomputer (1) is provided with a writing processing unit (2), and the writing processing unit (2) is obtained from an external device. When it is determined that access is in operation based on the signal of
The predetermined terminals (6a), (6b)... (6h) are used as data input / output terminals for accessing the nonvolatile memory (3), and the predetermined terminals (6a), (6b). When a second signal is obtained from the outside with (6h) being a data input / output terminal, predetermined terminals (6a), (6b),. The preset data obtained in the terminal is written to a predetermined address of the nonvolatile memory (3), and the predetermined terminals (6a), (6b),... (6h) are data input / output terminals. When a third signal is obtained from the outside, predetermined terminals (6a), (6b),... (6h) are used as data output terminals, and preset data stored in a predetermined address of the nonvolatile memory (3) is stored. And the first signal is supplied to the write processing unit (2). When there is no data, the data obtained at the predetermined terminals (6a), (6b),... (6h) is processed by the write processing unit (2), and the data is written into the nonvolatile memory (3) based on the processing result. And reading is controlled. [Operation] The microcomputer of the present invention supplies a switching signal indicating an access operation to a specific terminal of the microcomputer (1), so that the terminals (6a), (6b). (6h) is an access data input terminal of the memory (3), and in this state, this terminal (6a),
(6b) ··· (6h) By supplying the write data to this write data, the write data is written to the memory (3).
The written preset data can be read. [Examples] Hereinafter, one embodiment of the microcomputer of the present invention,
This will be described with reference to the accompanying drawings. In FIG. 1, (1) shows a microcomputer, and the microcomputer (1) is formed of one chip and includes a signal processing unit (2) and a nonvolatile memory (3). ) Performs various data processing, and stores data in the nonvolatile memory (3). The signal processing unit (2) and the nonvolatile memory (3) are connected by a bus line. The microcomputer (1) has a power input terminal (4), clock signal input terminals (5a) and (5b), a data input / output terminal (6) as terminals (ports),
An operation switching signal input terminal (7), a processing switching signal input terminal (8), a latch signal input terminal (9), an address signal input terminal (10), and a ground terminal (11) are provided. (4) to (11) are connected to the signal processing unit (2).
The data input / output terminal (6) is a terminal for inputting / outputting 8-bit parallel data, and has eight terminals (6a), (6).
b), (6c), (6d), (6e), (6f), (6h), (6
g) and (6h), the address signal input terminal (10) is also a terminal for inputting 8-bit parallel data, and has eight terminals (10a), (10b), (10c), (10d), (10e),
(10f), (10g) and (10h). The signal processing unit (2) operates using the power obtained at the power terminal (4) as the driving power and the oscillation signals obtained at the clock signal input terminals (5a) and (5b) as the clock signal. In this operation, as shown in the flow chart of FIG. 2, when a high-level signal "1" is supplied from the outside to the operation switching signal input terminal (7), the signal processing unit (2) switches to the data input / output terminal (6). The normal operation such as the processing of the data obtained in (1) is performed. When a low-level signal “0” is supplied from the outside to the operation switching signal input terminal (7), the signal processing unit (2)
Performs data access processing. At this time, the signal supplied to the processing switching signal input terminal (8) is detected by the signal processing unit (2), and when the signal is a high level signal "1", the nonvolatile memory is controlled by the signal processing unit (2). A process of writing data to (3) is performed. When the processing switching signal obtained at this input terminal (8) is a high-level signal "1" and the write processing is performed, while the latch signal high-level signal "1" obtained at the latch signal input terminal (9) is being processed, The corresponding address of the non-volatile memory (3) specified by the 8-bit address signal obtained at the address signal input terminal (10) is set to a state in which data can be written. When 8-bit data is supplied to the data input / output terminal (6) at this time, a predetermined value of the nonvolatile memory (3) in which the data is set as described above under the control of the signal processing unit (2) is provided. Write to address. When the signal processing unit (2) performs data access processing, the signal processing unit (2) detects that the signal obtained at the processing switching signal input terminal (8) is a low level signal “0”. Then, the signal processing unit (2) performs a process of reading data from the nonvolatile memory (3) under control. When the processing switching signal obtained at this input terminal (8) is a low level signal "0" and the read processing is performed, while the latch signal obtained at the latch signal input terminal (9) is a high level signal "1", The data written at the corresponding address of the nonvolatile memory (3) designated by the 8-bit address signal obtained at the address signal input terminal (10) is read out to the signal processing unit (2), and the signal processing unit ( 2)
Supplies the read data to the data input / output terminal (6) of the microcomputer (1), and outputs the read data from the data input / output terminal (6). Next, an operation of writing data to the nonvolatile memory (3) of the microcomputer (1) of the present embodiment will be described. First, this single microcomputer (1)
When writing data to the non-volatile memory (3) of
As shown in FIG. 1, the clock signal input signals (5a), (5
An oscillator (12) is connected to b), and a clock signal is supplied to the microcomputer (1). A power signal is supplied to a power terminal (4) from a power circuit (not shown). An external data generator (not shown) is connected to a data input / output terminal (6) of the microcomputer (1).
It is connected to the switching signal input terminals (7) and (8), the latch signal input terminal (9), and the address signal input terminal (10), and the low level signal "0" is sent from this data generator to the operation switching signal input terminal (7). And the signal processing unit (2) performs an access operation, and supplies a high-level signal “1” to the processing switching signal input terminal (8) to perform a write access operation. . In this state, a high level signal "1" is supplied from the data generator to the latch terminal (9) for several milliseconds, and the address signal input terminal (10) is supplied to each terminal (10a) to (10h) during this high level period. An 8-bit address signal is supplied, and subsequently, write data of each of the data input / output terminals (6) (6a) to (6h) is supplied. By supplying the signal from the data generator in this manner, the supplied write data is written to the address of the nonvolatile memory (3) specified by the address signal. When reading data stored in the nonvolatile memory (3) of the microcomputer (1), a low level signal "0" is supplied from an external data generator to the operation switching signal input terminal (7). The signal processing unit (2) performs an access operation, and the processing switching signal input terminal (8)
Is supplied with a low-level signal “0” to perform a read access operation. In this state, a high level signal "1" is supplied from the data generator to the latch terminal (9) for several milliseconds, and the address signal input terminal (10) is supplied during this high level period.
An 8-bit address signal is supplied to each of the terminals (10a) to (10h). When the address signal is supplied in this manner, the data written at the address of the nonvolatile memory (3) specified by the address signal is read out to the signal processing unit (2), and the signal processing unit (2) is read. ) Supplies the read data to the data input / output terminals (6a) to (6h), and outputs the read data. In the microcomputer (1) of the present embodiment, the signal processing unit (2) performs the access operation by judging the state of the operation switching signal and the processing switching signal as described above. Data can be written to the non-volatile memory (3) without being incorporated in a device such as a John receiver. Therefore, it is not necessary to operate various buttons to write data, and it is possible to easily write data in a short time with the single-chip microcomputer (1) alone. By simultaneously supplying signals such as write data to be supplied to each terminal of the microcomputer (1) to a plurality of microcomputers having the same configuration, data can be simultaneously written to the nonvolatile memories (3) of the plurality of microcomputers. And the data writing efficiency is further improved. Also, when the data stored in the non-volatile memory (3) is to be read for confirmation of the write data or the like, the microcomputer is similarly left alone by setting the processing switching signal to the low level signal "0". Can read data. It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention. [Effect of the Invention] According to the microcomputer of the present invention, even though the memory is built in the microcomputer, data can be easily written with the microcomputer alone, and the channel preset of the television receiver can be performed. There is an advantage that data can be easily written.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a microcomputer according to the present invention, and FIG. 2 is a flowchart showing the operation of the example of FIG. (1) is a microcomputer, (2) is a signal processing unit,
(3) is a nonvolatile memory, (7) is an operation switching signal input terminal, and (8) is a processing switching signal input terminal.

Claims (1)

(57) [Claims] Preset data of a predetermined function of the electronic device is written in the built-in nonvolatile memory, and a microcomputer that controls a predetermined function of the electronic device by the written preset data, wherein the microcomputer has a write processing unit, When the write processing unit determines that an access operation is being performed based on a first signal obtained from the outside, a predetermined terminal is used as an access data input / output terminal of the nonvolatile memory; Is a data input / output terminal, when a second signal is obtained from the outside, the predetermined terminal is used as a data input terminal, and preset data obtained at the data input terminal is stored in a predetermined address of the nonvolatile memory. When a third signal is obtained from the outside while the predetermined terminal is a data input / output terminal. The predetermined terminal is a data output terminal, and preset data stored at a predetermined address of the non-volatile memory is output from the data output terminal. When the first signal is not supplied to the write processing unit, A microcomputer, wherein the write processing unit processes data obtained at the predetermined terminal, and controls writing and reading of the nonvolatile memory based on a result of the processing.