JPS63296116A - Power source disconnection monitoring circuit system - Google Patents

Abstract

PURPOSE:To automatically perform a continuous processing after a power source is recovered, by applying system reset on all of the related peripheral devices in addition to a central processing unit by an output from a power source disconnection recovery detecting part which detects the recovery of power source disconnection. CONSTITUTION:A power source disconnection detecting part 1 monitors an AC voltage, and outputs a power source disconnection signal when the power source disconnection continues for a constant time. A compulsory interruption part 2 confirms the fact that the power source disconnection signal is not an error signal due to noise, etc., and applies interruption on the central processing unit, and interrupts the operation of the central processing unit. Also, the power source disconnection recovery detecting part 3 outputs a recovery signal when an operable state is set by supplying a regulated voltage, etc., to the central processing unit. And system reset part 4 sends reset signals to the central processing unit and all of the related peripheral devices, then, performs the initialization of the system.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power-off monitoring circuit system, and particularly to a power-off monitoring circuit system in an information processing system that notifies a central processing unit by an interrupt when a power outage is detected. .

[Conventional technology]

Conventionally, this type of power-off monitoring circuit system detects a power-off and notifies the central processing unit of the occurrence of a power-off through an interrupt.
The central processing unit is able to perform necessary evacuation processing during the power-off tolerance time of the DC power supply.

[Problem that the invention seeks to solve]

However, in the conventional power-off monitoring circuit system described above, a forced interrupt is notified to the central processing unit when a power-off occurs, so even if it has an automatic reset function when the power is restored, However, if the power is cut off for a short time, all the processing units will not be reset and will remain in a stopped state, but there is a drawback that there is a possibility that erroneous control signals will be output to peripheral devices.

An object of the present invention is to provide a power-off monitoring system that notifies a central processing unit of a power-off using an interrupt when the power is turned off, and that enables automatic continuation of processing after the power is restored by resetting the system when the power is restored. The purpose is to provide circuits.

[Means for solving problems]

The present invention provides a power-off monitoring circuit system that detects an input power-off and notifies a central processing unit of the power-off using an interrupt.
The system includes a power-off recovery detection unit that detects recovery from a power-off recovery, and a system reset unit that uses the output from the power-off recovery detection unit to provide a reset signal to all related peripheral devices in addition to the central processing unit. configured.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. Reference numeral 1 denotes a power-off detection unit which monitors the AC voltage and outputs a power-off signal if the power continues to be cut off for a certain period of time. Reference numeral 2 denotes a forced interrupt unit, which after confirming that the power-off signal from 1 is not an erroneous signal due to noise or the like, issues a forced interrupt to the central processing unit, thereby interrupting the operation of the central processing unit. Reference numeral 3 denotes a power-off recovery detection unit, which outputs a recovery signal when a specified voltage or the like is applied to the central processing unit and the central processing unit becomes operational. Reference numeral 4 denotes a system reset unit which, upon receiving the recovery signal, sends a reset signal to the central processing unit and all related peripheral devices to initialize the system.

〔Effect of the invention〕

As explained above, the present invention performs power failure recovery detection,
By performing a system reset, it is possible to avoid system stoppages during recovery and malfunctions when restarted, and it has the effect of guaranteeing normal operation during recovery, as well as a short time without the need for software intervention. The system can be automatically reset even when the conventional system cannot be reset sufficiently due to power-off, and the central processing unit can resume processing after completely initializing the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. 1... Power-off detection section, 2... Forced interrupt section, 3...
- Power-off recovery detection section, 4... system reset section.

Claims (1)

[Claims] In a power-off monitoring circuit system that detects an input power-off and notifies the central processing unit of the power-off using an interrupt, there is a power-off recovery detector that detects recovery from a power-off, and an output from this power-off recovery detector. and a system reset section that provides a reset signal to all related peripheral devices in addition to the central processing unit.