JPH01298458A - 1 chip microcomputer - Google Patents

Abstract

PURPOSE:To simply and rapidly correspond to respective types of a program by a dividing the control of 1 chip microcomputer into a main CPU and a sub-microcomputer. CONSTITUTION:A main CPU 22 to process a control program with a small change is provided on a single chip substrate 20, a memory or an I/O cell which is peripheral equipment is I/C-operated with the same chip substrate, and the I/O cell of either of them is IC-operated integrally at the same chip substrate as a sub-microcomputer to execute the auxiliary program processing to change each time in accordance with respective machine types or the form of the necessary control object. Thus, the pattern design to be able to meet the respective types of the different request can be facilitated on one chip microcomputer and the necessary function change can be rapidly coped with.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is an improvement of a one-chip microcomputer, particularly a one-chip microcomputer in which a core CPU and various I/O cells are integrally formed on the same substrate. It is related to.

[Prior Art] The development of LSI microprocessors has made it possible to computerize electrical or mechanical control in all fields, and the role played by them is extremely important.

Typically, a microprocessor includes a CPU (central processing unit) including a program counter, instruction memory, and peripheral I/O (input/output units). In this type of microprocessor, a single common substrate, usually a silicon chip, contains CPU, )Mo+)(RAM, ROM)
) and l1O-tyl integrated into an IC is known as a one-chip microcomputer.

These one-chip microcomputers can complete an entire system by directly connecting an input device such as a keyboard and an output device such as a display circuit printer.In recent years, 16-bit or 32-bit high-speed, large-capacity processing A possible one-chip microcomputer has been put into practical use.

FIG. 2 shows an example of a conventional one-chip microcomputer, in which a single core CPU 12 and peripheral devices such as memory such as ROM 14 and various I/O cells 16 are installed on a silicon chip substrate/O. It is integrated into an IC.

Therefore, according to a one-chip microcomputer using such a core type CPU, a dedicated functional microprocessor that is small, inexpensive, and performs high-speed and complex processing is created by pre-programming and incorporating predetermined tasks. can be obtained.

As an example of a 1-chip microcomputer in terms of q2,
2. Description of the Related Art Remote control receiving devices for A/V equipment are known. As is well known, according to the remote control receiving device, various types of vibration, V
TR, stereo, etc. can be controlled remotely using infrared rays, and in recent years remote control has become the mainstream for operating AV equipment rather than operating the main unit, and its functions have become more complex. It is extremely suitable for high-speed multifunctional processing.

The functions of the remote control receiving device can be broadly divided into remote control receiving processing and device control processing, and both of these processings are performed sequentially or in parallel.

In the conventional remote control receiving device, both such remote control receiving processing and device control processing are performed by a series of related program processing, and one CPU is involved in both processing.

However, with the spread of remote control devices in recent years, each model of A/V equipment requires significantly different types of processing, and one-chip microcomputer programs have been developed for each model or format. There was a problem that had to be designed.

Such requirements have created the problem that not only remote control devices but also general one-chip microcomputers for controlling other devices require many types of chips.

In the past, several measures have been taken to meet these demands, but each has various problems, and it is difficult to provide sufficiently superior functions and low-cost components that are especially necessary for ICs.
There was a problem that chip microcomputers could not be obtained.

Below, conventional problems will be explained using a remote control receiving device as an example.

[Problem to be solved by the invention' In most cases, the main body's microcomputer is used only for commonly used equipment control processing.

According to this method, by transmitting signals between both chips, it is possible to perform program processing similar to that of a conventional one-chip microcomputer, but on the other hand,
There is a problem in that the multi-chip configuration imposes significant price constraints.

The second method is to increase the size of the core CPU program,
For example, if a remote control input signal interrupts the CPU, the current processing is temporarily interrupted and reception processing is performed, or a microcomputer program periodically monitors the remote control human signal and when this human input signal occurs, This adds a program that only performs reception processing.

However, the second method requires wasted effort in program development, and since a normal remote control signal has a relatively long signal length, there is a problem that the responsiveness of other equipment control processing is reduced.

The method shown in Figure 3 is to externally attach the remote control receiver to the same chip of a one-chip microcomputer using hardware.
This has the advantage that the chip microcomputer can be shared over a wide range of areas.

However, according to this third method, a circuit is required for each type of remote control signal, and there is a problem that a general-purpose one-chip microcomputer cannot be obtained.

The present invention has been made in view of the above-mentioned problems in the past, and its (1) purpose is to easily enable pattern design that can meet various different requirements on a single-chip microcomputer;
Another object of the present invention is to provide a one-chip microcomputer capable of designing flat claw patterns that can quickly respond to necessary functional changes.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a main CPU for processing a control program with few changes on a single chip substrate, and a memory that is a peripheral device thereof. Alternatively, the I/O cells can be integrated into ICs on the same chip substrate, and any of the above I/O cells can be used as a sub-microcomputer to perform auxiliary program processing that can be used each time depending on the type or type of control target. It is characterized by being integrated into an IC on the same chip substrate.

Therefore, according to the present invention, on a common chip board, auxiliary program processing with frequent program changes is integrated into a sub-microcomputer, and this sub-microcomputer has its own CPU, memory, and instruction decoder, The receiver has a special function, for example, a reception processing function in a remote control receiver, and communicates with the main CPU, thereby eliminating the need to increase the size of the chip. This enables program processing.

According to the present invention, by changing only the sub-microcomputer (or its program) according to various models or formats, it is easy to develop and design a one-chip microcomputer with other parts common. There is an advantage that it can be done.

[Example] Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a preferred embodiment in which a one-chip microcomputer according to the present invention is applied to a remote control receiver.

In FIG. 1, a chip board 20 includes a main CPU, 2
2 is made into an IC, and a plurality of I/O cells 26 are similarly made into an integrated IC around it.

The main CPU 22 itself includes an arithmetic circuit 28 and a RAM.
30, a ROM 24, and a command decoder 32, and according to the embodiment, it is possible to control the A/V equipment according to remote control commands. And these main CPUs
22 and other I/O cells 26 hardly change depending on the model or type of A/V equipment, and these parts can be almost shared.

A characteristic feature of the present invention is that a sub-microcomputer 40 is integrated into an IC on the chip substrate 20 instead of any of the I/O cells, and the sub-microcomputer 40 in the embodiment is Dedicated remote control reception processing.

In FIG. 1, the sub-microcomputer 40 itself includes a CPU 42, a memory 44, and an instruction decoder 46, and functions similarly to the main CPU 22, but in the embodiment, its function is limited to remote control reception processing as described above. ing. Normally, in a remote control receiving device, the sub microcomputer 40 is limited to remote control reception processing, and its small processing power is sufficient compared to the processing power of the main CPU 22 that controls the equipment.

Although not shown in detail, the sub-microcomputer 40 can process signals input from its remote control signal input port and supply the results of the calculation to the main CPU 22.

Therefore, the main CPU 22 can perform predetermined equipment control processing with high efficiency by referring to the output of the sub-microcomputer 40 at any time during the execution of its own program (no need to synchronize with the remote control signal).

Of course, in the present invention, the main CPU 22 and the sub-microcomputer 40 share a synchronization clock signal, a power supply, a reset signal, etc., and are mounted on the same chip board 20.
By integrating both into an IC, it is possible to perform the same functions as a conventional one-chip microcomputer without changing the overall size, and the calculation speed is increased by sharing the above-mentioned signals. There will be no delay. Furthermore, by performing a plurality of processes in parallel, the processing speed (responsiveness, etc.) for device control becomes faster. By making the sub CPU 40 dedicated and independent, differences depending on the model or model of the remote control device, mainly differences in the signal type (code content) of the remote control device, can be easily changed by simply rewriting the contents of the memory 44. According to the present invention, most of the other control programs can be made into a common pattern, so it is possible to easily develop and design a 1-chip microcomputer even for a new model or model. becomes.

[Effects of the Invention] As explained above, according to the present invention, since the control of a one-chip microcomputer is divided between the main CPU and the sub-microcomputer, necessary changes in the sub-microcomputer can be quickly dealt with. This has the advantage of being able to easily and quickly respond to various program changes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a one-chip microcomputer according to the present invention configured as a remote control receiving device, and FIG. 2 is an explanatory diagram showing the configuration of a conventional general one-chip microcomputer. 20...Chip board 22...Main CPU 24...Memory ROM 26...I/O cell 40...Sub microcomputer

Claims (1)

[Claims] (1) CP with arithmetic circuit, memory and instruction decoder
In a one-chip microcomputer in which a U and an I/O cell connected to the CPU and making input/output connections with external circuits are integrally formed on the same substrate, any of the I/O cells may itself be an arithmetic circuit, A one-chip microcomputer comprising a sub-microcomputer including a memory and an instruction decoder.