JPS59229652A - Adaptive system evaluator - Google Patents

Abstract

PURPOSE:To use in common a microprocessor constituting an adaptive system evaluator (ASE) by connecting a signal directiin switching circuit changing the terminal function between the microprocessor and a printed board. CONSTITUTION:The signal direction switching circuit BD changing the terminal function is connected between a specific input or output, e.g. a control signal terminal which is different from others in accordance with the kind, of the microprocessor MPU and the input or output terminal of the printed board constituting the ASE. For instance, a two-way bus driver is used as the signal direction switching circuit BD and a signal is selectively transmitted from a node A to a node B, and vice versa.

Description

[Detailed Description of the Invention] [Technical Field] The present invention is based on the ASE (Adaptive System).
The present invention relates to an adaptive system evaluator (e.g., adaptive system evaluator), and relates to, for example, a technique effective for system debugging of microcomputers.

[Background technology]

Systems using microcomputers are usually small-scale and equipped with only the necessary functions. On the other hand, since the information processing becomes complicated,
Synchroscopes and logic analyzers alone are insufficient for debugging such systems, and cannot deal with runaway programs or system abnormalities that are poorly reproducible.

For debugging such systems, it is necessary to display the flow of the program, and to obtain and obtain bus information and external signals over multiple cycles just before the user system stopped.
A device with functions such as display is required. ASE is used for debugging such systems.

The following can be considered as ASE.

That is, the microprocessor constituting the ASE operates as a microprocessor of the user system, and at the same time has the various functions described above. For this reason, it is necessary to develop the above-mentioned microprocessor dedicated to ASE in accordance with the development of microprocessors constituting the microcomputer system.

Therefore, the microprocessor constituting the above-mentioned ASE requires a long time to develop. =, so there is a drawback that the production cost is high.

The inventor of the present invention has focused on the fact that among the microprocessors configuring the various types of microcomputer systems mentioned above, many of the microprocessors with the same bit configuration have the same bin functions and bin arrangement. We considered using the ASE device used in different types of Microconi/Piyuk systems.

[Purpose of the invention]

An object of the present invention is to provide an ASE that can realize common use of microprocessors that constitute the ASE.

The above and other objects and novel features of this invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Summary of the invention]

A brief overview of typical inventions disclosed in this application is as follows.

In other words, by providing a signal direction switching circuit that changes the terminal function between a specific input or output terminal of the microprocessor that makes up the ASE and the input or output electrode of the printed circuit board that makes up the ASE, it is possible to The above-mentioned microprocessor is used in common for microcomputer systems.

〔Example〕

FIG. 1 shows a schematic external appearance of an ASH showing an embodiment of the present invention.

ASE (Adaptive System Evaluator)
The BOX contains the microprocessor that constitutes the ASE, and is connected to the MPU socket of the user system UMC to perform system debugging via a flat cable with an Mr'U (microprocessor) connector. And with the other flat cable,
It is connected to system development equipment.

With such a connection, the microprocessor of the ASEBOX operates according to the development program on the floppy disk, etc. read by the monitor program of the system development device (including the floppy disk, etc.), and the necessary data is stored. Input, program creation, modification, etc. are performed using a keyboard or the like connected to the system development device, and necessary data is displayed on a display device or the like connected to the system development device.

FIG. 2A shows a block diagram of an embodiment of a printed wiring circuit including a microprocessor in the ASEBOX.

The MPU is a microprocessor constituting the ASE, and the following signal direction switching circuit BD is provided on a printed circuit board on which the microprocessor MPU is mounted.

For example, even if the microprocessors that make up an 8-bit microcomputer are of different types,
Many of the pin arrangements constituting address terminals, data terminals, and power supply terminals are the same, and only the control signal terminals differ depending on the product type. Taking this into consideration, in this embodiment, a signal direction switching circuit BD is provided for the control signal terminal. That is, the microprocessor M P constituting the above ASE
By mounting the signal direction switching circuit BD on a printed circuit board on which U is mounted, the pin arrangement of the microprocessor MPU as seen from the external connection electrode of this printed circuit board is a microprocessor of a microcomputer system in which debugging etc. are to be performed. It has the same pin arrangement as .

Although not particularly limited, a bidirectional bus driver as shown in FIG. 2B is used as the signal direction switching circuit BD. As shown in the figure, this bidirectional bus driver selectively transmits signals from node A to B or from B to A using a control signal C. That is, the control signal C
If control signal C is a low level logic "0", one bus driver B1 becomes active and transmits a signal from node A to node B, and if control signal C is a high level logic "1", the other bus driver B1 becomes active and transmits a signal from node A to node B. Bus driver B2 is activated and transmits a signal from node B to node A. As a result, Hit of a certain microprocessor MPU
Control signals and the like can be selectively switched to input or output signals. Since such a bidirectional bus driver is well known, a detailed description of its circuit will be omitted.

Therefore, the microprocessor MPU that makes up the -+ SE device of this embodiment is implemented.
In the co-wiring board, the deflection control of the bidirectional bus driver (by forming No. d C to pass light,
This is to ensure that the microcomputer system on which system debugging and the like is to be performed is made equivalent to its pin arrangement.

It should be noted that the above-mentioned (no. 71 direction cut) negative circuit may be connected to all terminals of the microprocessor yMPU without using the phantom L7.

〔effect〕

11.) Using a wiring board equipped with the same microprocessor that serves ASB, software that selectively switches the signal direction switching circuit can be used to create a microprocessor that is equivalent to the microprocessor that serves different types of microcomputer systems. By adding functionality, you can get a great effect. (2) Due to (1) above, there is no need to develop a dedicated ASE for the microcomputer system that requires system debugging, etc.
This has the effect of reducing the time required for its development.

(3) Through (11 and (2)) above, it is possible to mass-produce the wiring board that connects the microprocessor that constitutes the ASE, thereby significantly reducing the production cost. It will be done.

(4) According to (1) above, by realizing the switching of the signal direction using a predetermined program, it is possible to easily debug microcomputer systems of different types using the C1 common ASg.
J results are obtained.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that this invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor. example! The signal direction switching circuit described above is a combination of multiplex circuits,
It may also be possible to perform more complex bin arrangement switching.

[Application field]

The present invention can be widely used as a device for performing system debugging of a microcomputer system.

[Brief explanation of the drawing]

Fig. 1 is an external view of the ASE shield R6 showing an embodiment of the present invention, Fig. 2A is a clock diagram showing an embodiment of the printer 1 wiring circuit including the microprocessor in the person 5EBOX, and Fig. 2B. is 4. FIG. 2 is a circuit diagram showing an embodiment of the signal direction switching circuit. A SF, B OX...Adaptive system...
Evaliator BOX, UMC...user system,
MP (J...Microprocessor, BD...Signal direction switching circuit

Claims (1)

[Claims] 1. Includes a microprocessor and a signal direction switching circuit that is provided at a specific input or output terminal of the microprocessor and changes the terminal function with respect to the input or output electrode of a printed circuit board. An adaptive system evaluator featuring: 2. The adaptive system evaluator according to claim 1, wherein the signal direction switching circuit is a bidirectional bus driver.