JP2709392B2 - Development method of microcomputer system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system development device, and more particularly to a technique that is effective when used in a system development device of a one-chip microcomputer for a specific application.

[Conventional technology]

An example of a microcomputer system development apparatus is “Hitachi Microcomputer System 6305U0 / 6305V0 Emulator User's Manual”, pages 64 to 88, issued in September 1985 by Hitachi, Ltd.

[Problems to be solved by the invention]

In the above-mentioned one-chip microcomputer, the built-in peripheral circuits are fixed. Therefore, there is no problem in making a microcomputer chip for system development. However, with the microprocessor as the core,
ASIC that mounts peripheral circuits according to user specifications among peripheral circuits such as timer, DMAC (direct memory access control circuit), A / D conversion circuit, D / A conversion circuit, memory circuit etc. Microcomputers (for specific applications) inevitably come in small quantities and many types. Therefore,
If a chip for system development is made for each product type, there is a problem that the development and manufacturing man-hours increase.

An object of the present invention is to provide a system development apparatus for a one-chip microcomputer for a specific application, in which the development and manufacturing steps are significantly reduced.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[Means for solving the problem]

The outline of a typical invention disclosed in the present application will be briefly described as follows. That is,
A microprocessor and a plurality of peripheral circuits prepared in advance are formed as individual semiconductor integrated circuit devices, respectively, and a microprocessor and a peripheral circuit mounted on a mounting board according to user specifications are provided. A microcomputer system corresponding to the microcomputer of the chip is configured.

[Action]

According to the above-mentioned means, since it is only necessary to incorporate a semiconductor integrated circuit device in which a one-chip microcomputer for a system development device is formed in advance on a mounting substrate, the development and manufacturing steps can be greatly reduced.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a development microcomputer system used in a system development apparatus according to the present invention.

The one-chip microcomputer to be developed in this embodiment has a microprocessor as a core, a timer, a DMAC (direct memory access control circuit),
Peripheral circuits such as an A / D conversion circuit, a D / A conversion circuit, a memory circuit, and the like are provided as modules (standardized).
Peripheral circuits are selected from the various peripheral circuits according to the specifications of the user, and are formed together with the microprocessor in one semiconductor integrated circuit device to constitute a one-chip microcomputer.

In order to efficiently develop such a small-volume, multi-product microcomputer system, in this embodiment, each of the standardized peripheral circuits is separately formed together with the microprocessor by a semiconductor integrated circuit device. Put. In this case, to facilitate system development,
If necessary, the microprocessor CPU is provided with a terminal for outputting information on the contents of registers and the like to the outside. Then, as shown in FIG.
Various wirings such as a bus BUS for interconnecting the respective circuits are formed on the above, and a microprocessor CP is selected according to a one-chip microcomputer system to be developed.
U, custom module circuit CM, chip control circuit CC, timer, DMAC, A / D conversion circuit, D / A conversion circuit,
Peripheral circuits LC1 to LC6 such as a memory circuit are mounted.

It is desirable to unify the packages of the microprocessors and peripheral circuits in order to simplify the replacement. For example, 16K bytes of R
In a system having an OM (read only memory), a 1K byte RAM (random access memory), and an 8-bit reload timer, the respective semiconductor integrated circuit devices may be mounted at the positions of the peripheral circuits LC1 to LC3. . In order to change the 8-bit reload timer to a 16-bit reload timer due to a specification change, it is only necessary to extract the 8-bit reload timer and insert the 16-bit reload timer there.

In addition, if an IC socket corresponding to the maximum number of mounted peripheral circuits is mounted on the printed circuit board PB, the printed circuit board PB can be standardized, and any target microcomputer system having the standardized peripheral circuit can be used. It can be shared. Instead of the IC socket, the printed circuit board PB may be provided with through holes for soldering IC pins.

The printed circuit board PB has a terminal ASE connected to a system development device. The terminal ASE is connected to a bus BUS formed on the printed circuit board PB and a wiring to which terminals for probes are coupled, and an emulator system including a microprocessor and the like constituting a system development device via a flat cable or the like. Connected to the side. The printed circuit board PB has a user terminal USR. This terminal USR
It is connected via a flat cable or the like to an IC socket on which a one-chip microcomputer in the user system is mounted. As a result, the microcomputer system configured on the printed circuit board PB operates in place of the one-chip microcomputer constituting the user system to be developed, and has an emulation function that substitutes for the function of the target microcomputer. Is provided. Further, the system development device (not shown) also has a function of renting out memory resources on the system (emulator) side when the memory on the user system side is inoperable or has insufficient capacity.

By using the microcomputer system configured on the printed circuit board PB of the present embodiment, by selectively mounting the semiconductor integrated circuit devices configured as described above, a development tool according to the user specification can be immediately performed. Since it can be provided, the development period can be shortened and the cost can be reduced.

The operational effects obtained from the above embodiment are as follows. (1) A microprocessor and a plurality of peripheral circuits prepared in advance are formed as individual semiconductor integrated circuit devices, respectively, and the microprocessor and the peripheral mounted on a mounting board according to the specifications of the user. By configuring a microcomputer system for development corresponding to a one-chip microcomputer having a circuit, a one-chip microcomputer for a system development device can be simply mounted on a mounting substrate on a semiconductor integrated circuit device formed in advance. Therefore, the effect of greatly reducing the number of development and manufacturing steps can be obtained.

(2) If a through hole for mounting or mounting an IC socket corresponding to the maximum number of mounted peripheral circuits is formed as the mounting substrate, the printed circuit board PB can be standardized, and the standardized peripheral circuit is provided. The effect is obtained that it can be shared by all target microcomputer systems.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention of the present application is not limited to the embodiment, and it is needless to say that various modifications can be made without departing from the gist of the invention. Nor. For example, a plurality of microprocessors may be prepared.
In this case, the system development of a different one-chip microcomputer system having a 4-bit, 8-bit and 16-bit configuration can be simplified. Also, among the peripheral circuits, ROM
As the RAM or the RAM, a commercially available RAM configured in a semiconductor integrated circuit device may be used. Further, the configuration of the mounting board may be any.

The present invention is based on a building block system using a standardized peripheral circuit represented by an ASIC.
It can be widely used as a system development device for a chip microcomputer or a semiconductor integrated circuit device having a microcomputer function.

〔The invention's effect〕

The effect obtained by the representative one of the inventions disclosed in the present application will be briefly described as follows. That is, the microprocessor and a plurality of peripheral circuits prepared in advance are formed as individual semiconductor integrated circuit devices, respectively, and the microprocessor and the peripheral circuits mounted on the mounting board according to the user's specifications are combined. By configuring a microcomputer system for development corresponding to a one-chip microcomputer, it is only necessary to incorporate a semiconductor integrated circuit device in which a one-chip microcomputer for a system development device is formed in advance on a mounting substrate. The development and manufacturing man-hours can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a microcomputer system for system development used in a system development apparatus according to the present invention. CPU: microprocessor, CM: custom module circuit, CC: chip control circuit, LC1-LC6 ...
Peripheral circuit, BUS: Bus, PB: Printed circuit board

Claims (1)

(57) [Claims] 1. A plurality of microprocessors and peripheral circuits, each of which is standardized and prepared in advance as an individual semiconductor integrated circuit device, and a mounting portion capable of mounting one microprocessor and one peripheral circuit each. A bus connecting between the microprocessor and peripheral circuits mounted on the mounting portion, a terminal for allowing at least a signal on the bus to be extracted to the outside, and a terminal for enabling connection to a user system. A mounting board provided is prepared, and required ones are respectively selected from the standardized microprocessor and the peripheral circuit, and mounted on the corresponding mounting part to configure a microcomputer system having desired specifications. A method for developing a microcomputer system, characterized in that: