JPH11134308A - Reset device for microcomputer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain function reservation from an abnormal state by resetting the plural microcomputers of the destination of communication when communication can not be performed in constitution in which more than three microcomputers are connected with a communication line. SOLUTION: Communication which is being operated between a main microcomputer 1 and sub-microcomputers 2 and 3 is monitored by a communication monitoring means 4, and when communication can not be performed, the sub- microcomputers 2 and 3 are reset by a resetting means 5, and the processing is continued after the function restoration of the sub-microcomputers 2 and 3 in a prescribed time. Thus, function restoration can be attained when communication can not be performed in a system in which more than three microcomputers are connected with a communication line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer reset device.

[0002]

2. Description of the Related Art Conventionally, communication between microcomputers is performed on a one-to-one basis. FIG. 2 shows a conventional configuration. In the communication between the microcomputers, the communication is monitored, and when the communication from the communication destination microcomputer has not been performed for a certain period of time or an abnormality in the communication content is detected, the partner microcomputer is reset to recover from the abnormal state.

[0003]

As described above, in the conventional configuration, one-to-one communication had to be performed in order to reset upon detecting a communication abnormality and recover from the abnormality. In a configuration in which three or more microcomputers are connected on a communication line, when communication becomes impossible, it is not possible to know which microcomputer is abnormal and it is not possible to recover from the abnormal state.

[0004]

According to the present invention, in order to solve the above-mentioned problems, it is possible to recover from an abnormal state even in communication between three or more microcomputers by using means for resetting a plurality of microcomputers. It was done.

According to the present invention, an abnormal state can be recovered even if three or more microcomputers are connected on a communication line.

[0006]

According to the first aspect of the present invention, when communication becomes impossible, a plurality of microcomputers are reset by means for resetting a plurality of microcomputers to recover from an abnormal state. This is an apparatus capable of recovering from an abnormal state even if three or more microcomputers are connected on a communication line.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 shows a block diagram of a microcomputer reset device according to Embodiment 1 of the present invention.

In FIG. 1, a main microcomputer 1, a sub-microcomputer 2, and a sub-microcomputer 3 perform respective processes while performing communication through a communication line 6.

The communication monitoring means 4 is means for monitoring communication contents and detecting an abnormal state, and the reset means 5 is means for the main microcomputer 1 to reset the sub microcomputer 2 and the sub microcomputer 3.

In the communication between the main microcomputer 1 and the sub-microcomputer 2 or the sub-microcomputer 3, the communication monitoring means 4 monitors the communication, and uses the reset means 5 to reset the sub-microcomputer 2 and the sub-microcomputer when communication becomes impossible. Reset 3 and
After waiting for the recovery of the function of the sub-microcomputer reset for a predetermined time, the processing is continued.

[0011]

As described above, according to the present invention, in a system in which three or more microcomputers are connected to a communication line,
Function recovery can be performed when communication becomes impossible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a microcomputer reset device according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a conventional microcomputer reset device.

[Explanation of symbols]

 1 Main microcomputer 2 Sub microcomputer 3 Sub microcomputer 4 Communication monitoring means 5 Reset means 6 Communication line

Claims (2)

[Claims] 1. A microcomputer reset device which resets a communication partner microcomputer to recover from an abnormal state when communication between the microcomputers becomes impossible or when there is an abnormality in communication contents. 2. A communication line to which three or more microcomputers are connected, comprising means for detecting a communication abnormality and means for resetting a microcomputer of a communication partner to recover from an abnormal state. A resetting device for resetting a communication partner microcomputer to recover from an abnormal state.