JPS5983201A - Processing system of momentary break - Google Patents

Abstract

PURPOSE:To restart and continue a processing immediately in case of a short- time momentary power break by outputting a reset interruption signal to a program control processing device when the rotating speed of a motor reaches a prescribed value or smaller. CONSTITUTION:In case of a momentary power break, a motor 2 continues the rotation for a time because of inertia. The rotating speed of this motor 2 is detected by a rotation detecting circuit 3. Only when the rotating speed of the motor 2 reaches a prescribed value or smaller, the reset interruption signal is outputted from a reset circuit 6 to a microcomputer 7. Thus, the processing is restarted and continued immediately in case of the short-time momentary power break.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an instantaneous interruption processing method for a signal processing device incorporating a microcomputer (hereinafter referred to as MPtB).

(b) Background of the technology Recently, various devices with built-in MPUs have come to be used in offices and stores, but the power supply situation is not always stable in these places where they are used.
Furthermore, there are few cases in which sufficient power supply measures for security are provided on the equipment side.

(c) Conventional technology and problems Conventionally, in the case of a momentary power outage in the above-mentioned device, a reset interrupt is generated in the program in the same way as when the power is turned on, and the input data up to that point is treated as an error. , When restarting processing, load the initial program again (
IPL) and equipment maintenance diagnosis (RAS) checks were being conducted.

For this reason, there is a drawback that it is necessary to wait for a long time before processing can be continued.

(d) Purpose of the Invention An object of the present invention is to provide an instantaneous power failure processing method that detects when the power is cut off and allows processing to be continued quickly.

1(e) Structure of the Invention The present invention is a program control processing device that incorporates a rotational drive mechanism using a motor, in which the rotation of the motor is detected when a momentary power interruption occurs, and the rotation speed reaches a predetermined value or less. The present invention is characterized in that a reset interrupt signal is issued to the program control processing device for the first time when the alarm processing is performed.

(f) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

For example, in POS terminals, scanners that use holograms have recently been increasingly used to read barcode labels attached to products, and these scanners have a built-in motor to rotate them. has been done.

In such a device, when a momentary power failure occurs in the power supply, the motor does not stop immediately but continues to rotate for a while due to inertia.

Therefore, it is recommended to detect the rotation of the motor during this period, output a hold signal when the rotation speed is less than a predetermined value, and output a reset interrupt signal only when the rotation speed is less than a predetermined value. For example, when the instantaneous interruption time is short, processing can be restarted and continued immediately.

On the other hand, if the power is turned off and then turned on again, the initial settings of the work area and P
Initialization of the interface with the OS register, etc. is performed.

Figure 1 shows the motor rotation speed (a) when the power is turned on.
, a rotation detection pulse (b), an IRQ signal (c), and a reset interrupt signal (d).

Until the rotation speed of the motor reaches a predetermined value level R when the power is turned on, the period (1) of the rotation detection pulse is longer than the predetermined value, and as a result, a rotation field lightning interrupt signal (IRQ signal) is output. .

Here, a certain period (1゛) is set by a timer, and within this period, the motor reaches a specified rotation speed.
If the t reaches a predetermined value, subsequent processing is performed as consolidation, while if it does not reach the predetermined value within the period, an alarm state is set by the IRQ signal.

Figure 2 shows the motor rotation speed (a) during a momentary power interruption.
, rotation detection pulse (b), instantaneous interruption detection pulse (i.e.
3 is a timing chart showing the relationship between reset interrupt signals (BO);

In the same figure, until the rotational speed of the motor falls to a predetermined value level R, the period t of the rotation detection pulse is less than a predetermined value (for example, 12n8), and even if the momentary interruption detection pulse (e) is output, the processing will continue to be resumed.

If it is detected that the above-mentioned t has become a predetermined value or more, an IRQ signal is output by the instantaneous interruption detection pulse (e), and the initial setting of the area and P
Initialization of interface with OS registers and R
AS check etc. are performed.

FIG. 3 is a functional block diagram for implementing the instantaneous power failure processing method according to the present invention, in which 1 is a motor drive circuit, 2 is a motor, 3 is a rotation detection circuit for checking the rotation speed of the motor, and 3 is a rotation detection circuit for checking the rotation speed of the motor. The period (1) of the rotation detection pulse is compared with a reference value (τ) in synchronization with the rotation of No. 3, and if t≦τ, a hold signal is output, and if t>τ, an IRQ signal is output.

Further, 4 is an instantaneous power failure detection circuit for checking the power supply voltage and outputting a pulse when the voltage reaches a predetermined value or less, 5 is a power supply, and 6 is a signal pulse from the instantaneous power failure detection circuit 4 or the power supply 5. A recess/node circuit 7 detects the input and outputs a reset interrupt signal, and 7 is an MP[I, which receives the hold signal or IRQ signal from the rotation detection circuit 3 and the reset interrupt signal from the resent circuit 6. When input, it is determined from these combinations whether the power is momentarily cut off or turned on, and the conditions for restarting the process are determined as described above.

(g) Effects of the Invention According to the present invention, in the event of a short power interruption, processing can be continued and restarted, and a reduction in processing efficiency can be prevented. Furthermore, the present invention can be implemented by simply adding a relatively simple circuit, and has the effect of enabling lower costs than conventional instantaneous power failure detection methods.

[Brief explanation of the drawing]

1 and 2 are timing charts of signals in the instantaneous interruption processing method according to the present invention, and FIG. 3 is a functional block diagram thereof. In the figure, 1 is a motor drive circuit, 2 is a motor, and 3
4 is a rotation detection circuit, 4 is a momentary interruption detection circuit, 5 is a power supply, 6 is a reset circuit, and 7 is an MPU. off a year old 2 figure

Claims (1)

[Claims] In a program control processing device that has a built-in rotation drive mechanism using a motor, the rotation of the motor is detected when a momentary power interruption occurs, and only when the rotation speed reaches a predetermined value or less does the program control processing device An instantaneous interruption processing method characterized by issuing an interrupt signal and performing alarm processing.