JP2020155806A - Information processing apparatus and program - Google Patents

Abstract

To detect a detection part detecting change in an external factor after a transition period ends even if the detection part receives the change in the external factor during the transition period when moving processing to monitor whether the detection part detects the change in the external factor from a first control part to a second control part.SOLUTION: A FAX modem 30 once detecting an incoming call from outside changes the logic of a modem signal 110 to be output. A CPU 10 once detecting the logic change of the modem signal 110 performs control to execute processing corresponding to the incoming call to the FAX modem 30. The CPU 20 performs control to: switch a detecting method for logic change from edge detection to level detection when moving processing to monitor the logic change of the modem signal 110 from the CPU 10; enable interruption processing on the modem signal 110 when the transition period ends after the CPU 10 disables the interruption processing on the modem signal 110; and execute processing corresponding to the incoming call to the FAX modem 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to an information processing device and a program.

Patent Document 1 has a main CPU and a sub CPU, and when the main CPU receives an incoming call from an external line in the sleep mode, the sub CPU responds to the incoming call and activates the main CPU to control the modem. Is disclosed as a facsimile machine that delegates to the main CPU.

In Patent Document 2, the main controller unit prohibits the reception of interrupt signals during the transition period from the first power mode to the second power mode with low power consumption, and the transition to the second power mode is completed. Then, the interrupt prohibition is released, and when an interrupt signal is generated from the load during the transition period, the microcomputer repeatedly notifies the main controller unit of the interrupt signal as a pulse signal, and when the interrupt prohibition is released, the pulse signal is leveled. An image processing device that changes to a signal and notifies the user is disclosed.

Japanese Unexamined Patent Publication No. 2014-158129 Japanese Unexamined Patent Publication No. 2018-061167

An object of the present invention is that when the monitoring process of whether or not the detection unit has detected a change in an external factor is transferred from the first control unit to the second control unit, the detection unit causes the external factor during the transition period. It is an object of the present invention to provide an information processing device and a program capable of detecting that a detection unit has detected a change in an external factor even when a change is received after the end of the transition period.

[Information processing device]
The present invention according to claim 1 comprises a detection unit that changes the logic of an interrupt signal to be output when a change in an external factor is detected.
When the logical change of the interrupt signal is detected, the first control unit that controls to execute the process according to the change of the external factor detected by the detection unit, and the first control unit.
When controlling the first control unit and shifting the monitoring process of the logical change of the interrupt signal from the first control unit, the level of the detection method of the logical change of the interrupt signal is detected from edge detection. When the transition period ends after the interrupt processing due to the logical change of the interrupt signal is disallowed in the first control unit, the interrupt process due to the logical change of the interrupt signal is permitted. It is an information processing apparatus including a second control unit that controls so that processing is executed according to a change in an external factor detected by the detection unit according to the logical state of the interrupt signal.

The information according to claim 1, wherein the second control unit controls to switch the detection method of the logical change of the interrupt signal from level detection to edge detection after the end of the transition period. It is a processing device.

The present invention according to claim 3 according to claim 1 or 2, wherein the second control unit temporarily clears the detection state of the logical change of the interrupt signal during the transition period before the end of the transition period. It is an information processing device.

According to the fourth aspect of the present invention, when the operation mode of the own device is switched from the normal operation mode to the power saving mode, the second control unit determines the logic of the interrupt signal from the first control unit. The information processing apparatus according to any one of claims 1 to 3, wherein the change monitoring process is shifted and the first control unit is put into an operation stop state.

According to the fifth aspect of the present invention, the first control unit controls the detection unit to be in a power saving state before the operation is stopped.
The information processing device according to claim 4, wherein the detection unit logically changes the interrupt signal due to noise generated inside when shifting from the normal operating state to the power saving state.

In the present invention according to claim 6, the second control unit is shifted from the first control unit to monitoring the logical change of the interrupt signal, and an interrupt accompanying the logical change of the interrupt signal is permitted. When the logical change of the interrupt signal is detected, the operation mode of the own device is switched from the power saving mode to the normal operation mode, the first control unit is activated, and the external factor detected by the detection unit is activated. The information processing apparatus according to claim 4 or 5, wherein the processing is executed according to the change of the above.

[program]
The present invention according to claim 7 includes a step of detecting a change in an external factor and changing the logic of an interrupt signal to be output.
When the first control unit detects a logical change in the interrupt signal, it has a step of performing control to execute processing according to the detected change of an external factor.
In the second control unit that controls the first control unit, when shifting the monitoring process of the logical change of the interrupt signal from the first control unit, the method of detecting the logical change of the interrupt signal is edged. Steps to switch from detection to level detection,
In the second control unit, when the transition period ends after the interrupt processing associated with the logical change of the interrupt signal is disallowed in the first control unit, the interrupt process associated with the logical change of the interrupt signal is completed. Is a program for causing the computer to execute a step of controlling so that processing is executed according to a change in an external factor detected by the detection unit according to the logical state of the interrupt signal. is there.

According to the first aspect of the present invention, when the monitoring process of whether or not the detection unit has detected a change in an external factor is transferred from the first control unit to the second control unit, it is detected during the transition period. Even when the unit receives a change in an external factor, it is possible to provide an information processing device capable of detecting that the detection unit has detected a change in an external factor after the end of the transition period.

According to the second aspect of the present invention, the second control unit detects the logical change of the interrupt signal as compared with the case where the logical change of the interrupt signal is detected with the level detected even after the end of the transition period. It is possible to provide an information processing apparatus capable of reducing the processing load for performing the above.

According to the third aspect of the present invention, even if a logical change of the interrupt signal occurs due to a malfunction in the detection unit during the transition period, it is possible to prevent unnecessary processing from being executed after the end of the transition period. Information processing device can be provided.

According to the fourth aspect of the present invention, it is possible to provide an information processing device capable of reducing the power consumption of the device as compared with the case where the first control unit is not in the operation stop state.

According to the fifth aspect of the present invention, it is possible to provide an information processing apparatus capable of reducing the power consumption of the apparatus as compared with the case where the detection unit is not put into the power saving state.

According to the sixth aspect of the present invention, even if the second control unit does not have a function of executing processing according to a change in an external factor detected by the detection unit, the first control unit stops operating. It is possible to provide an information processing apparatus capable of executing processing according to the change of the external factor detected by the detection unit when the change of the external factor is detected in the detection in the case of the state.

According to the seventh aspect of the present invention, when the monitoring process of whether or not the detection unit has detected a change in an external factor is transferred from the first control unit to the second control unit, it is detected during the transition period. Even when the unit receives a change in an external factor, it is possible to provide a program capable of detecting that the detection unit has detected a change in an external factor after the end of the transition period.

It is a figure which shows the system structure of the image formation system of one Embodiment of this invention. It is a block diagram which shows the hardware structure in the normal operation mode of the image forming apparatus 10 in one Embodiment of this invention. It is a block diagram which shows the hardware composition in the sleep mode of the image forming apparatus 10 in one Embodiment of this invention. It is a figure for demonstrating the structure for detecting the logical change of the modem signal 110 by edge detection in CPUs 10 and 20. It is a figure for demonstrating the structure for detecting the logical change of the modem signal 110 by level detection in CPUs 10 and 20. It is a flowchart for demonstrating the process at the time of shifting the monitoring process of a modem signal 110 from CPU 10 to CPU 20 in the image forming apparatus 40 of one Embodiment of this invention. It is a figure for demonstrating the operation in the process of transition of the monitoring process from CPU 10 to CPU 20 explained in the flowchart of FIG. It is a figure which shows the timing chart when there is no incoming call when the detection trigger of a modem signal 110 is left as edge detection even during the transition of a monitoring process. It is a figure which shows the timing chart when there is an incoming call when the detection trigger of a modem signal 110 is left as edge detection even during the transition of a monitoring process. It is a figure which shows the timing chart when there is no incoming call when the detection trigger of a modem signal 110 is switched from edge detection to level detection during the transition of a monitoring process. It is a figure which shows the timing chart when there is an incoming call when the detection trigger of a modem signal 110 is switched from edge detection to level detection during the transition of a monitoring process.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an image forming system according to an embodiment of the present invention.

As shown in FIG. 1, the image forming system according to the embodiment of the present invention is composed of an image forming device 40 and a terminal device 50 which are interconnected by a network 60. The terminal device 50 generates print data and transmits the print data generated via the network 60 to the image forming device 40. The image forming apparatus 40 receives the print data transmitted from the terminal apparatus 50 and outputs an image corresponding to the print data on the paper. The image forming apparatus 40 is a so-called multifunction device having a plurality of functions such as a printing function, a scanning function, a copying function, and a facsimile function. A telephone line 70 is connected to the image forming apparatus 40 for fax transmission / reception.

Next, the hardware configuration of the image forming apparatus 40 in the image forming system of the present embodiment is shown in the block diagram of FIG.

As shown in FIG. 2, the image forming apparatus 40 includes a hardware control CPU 10, a main CPU 20, and a fax modem 30. In addition to the components shown in FIG. 2, the image forming apparatus 40 is provided with various components such as a printer unit, a scanner unit, an operation unit, and a display unit. However, in the present embodiment, the fax reception is performed. Since the operation is mainly described, other components will be omitted.

The main CPU 20 controls the operation of the entire image forming apparatus 40. The hardware control CPU 10 controls the operation of various devices such as the FAX modem 30. In the following description, the main CPU 20 is simply referred to as the CPU 20, and the hardware control CPU 10 is simply referred to as the CPU 10.

The FAX modem 30 transmits and receives FAX data to and from an external facsimile machine or the like via a telephone line 70. When the FAX modem 30 detects an incoming call from the outside via the telephone line 70, the fax modem 30 changes the logic of the output modem signal 110.

In the present embodiment, when the FAX modem 30 detects an incoming call from the outside, the modem signal 110 is set to a low level (hereinafter abbreviated as L level), and an undetected incoming call from the outside is not detected. In the case of, the modem signal 110 will be described as having a high level (hereinafter abbreviated as H level).

That is, the FAX modem 30 outputs the modem signal 110 as an interrupt signal to the CPUs 10 and 20, respectively, and notifies the presence or absence of an incoming call by changing the logic of the output modem signal 110.

Then, when the CPU 10 detects a logical change in the modem signal 110, the CPU 10 controls to execute a process according to the incoming call detected by the FAX modem 30.

The block diagram of the image forming apparatus 40 shown in FIG. 2 is a diagram showing a state in the normal operation mode.

The image forming apparatus 40 of the present embodiment has a function of operating in a sleep mode (or power saving mode) in addition to the normal operation mode in order to reduce power consumption. The image forming apparatus 40 is configured to reduce power consumption by automatically shifting from a normal operation mode to a sleep mode, for example, when an operation is not performed for a preset time or more.

FIG. 2 shows a state in the normal operation mode, and the CPU 10, the CPU 20, and the FAX modem 30 are all operating in the normal state. Then, in the normal operation mode, the CPU 10 sets the interrupt detection state when detecting the logical change of the modem signal 110 to the Enable state, that is, the interrupt enable state by software.

On the contrary, in the normal operation mode, the CPU 20 sets the interrupt detection state when detecting the logical change of the modem signal 110 to the software-disabled state, that is, the interrupt disallowed state or the interrupt masked state. It is set.

Therefore, in this normal operation mode, the CPU 10 performs the detection process of the logical change of the modem signal 110 from the FAX modem 30.

Next, the state of the image forming apparatus 40 in the sleep mode is shown in FIG.

In FIG. 3, the CPU 10 is in the power-off state and the FAX modem 30 is in the power-saving state in order to reduce the power consumption. In the FAX modem 30, the function of detecting the presence or absence of an incoming call from the telephone line 70 and logically changing the modem signal 110 is effectively operating even in the power saving state, but the process of receiving the FAX data is in the normal operating state. Otherwise, it cannot be executed.

Then, in this sleep mode, the CPU 20 sets the interrupt detection state when detecting the logical change of the modem signal 110 to the Enable state by software. That is, in the sleep mode, the CPU 20 performs the detection process of the logical change of the modem signal 110 from the FAX modem 30.

That is, when shifting from the normal operation mode as shown in FIG. 2 to the sleep mode as shown in FIG. 3, the monitoring process of the logical change of the modem signal 110 from the FAX modem 30 is shifted from the CPU 10 to the CPU 20. There is a need.

Then, when shifting the monitoring process of the logical change of the modem signal 110 from the CPU 10, the CPU 20 switches the detection method of the logical change of the modem signal 110 from the edge detection to the level detection, and accompanies the logical change of the modem signal 110 in the CPU 10. When the transition period ends after the interrupt processing is in the Disable state, the interrupt processing accompanying the logical change of the modem signal 110 is set to the Enable state, and the incoming call detected by the FAX modem 30 is responded to according to the logical state of the modem signal 110. Control so that the process is executed.

Specifically, when the monitoring process of the logical change of the modem signal 110 is transferred from the CPU 10 and the interrupt accompanying the logical change of the modem signal 110 is permitted, the CPU 20 detects the logical change of the modem signal 110. The operation mode of the device is switched from the sleep mode to the normal operation mode, and the CPU 10 is activated to execute the processing of the incoming call detected by the FAX modem 30.

After the transition period of the monitoring process ends, the CPU 20 controls a method of detecting a logical change of the modem signal 110, that is, switching the detection trigger from level detection to edge detection.

Then, when the operation mode of the own device is switched from the normal operation mode to the power saving mode, the CPU 20 shifts the monitoring process of the logical change of the modem signal 110 from the CPU 10, and puts the CPU 10 in an operation stop state, that is, a power off state. And.

The CPU 10 controls the fax modem 30 to be in a power saving state before the power is turned off.

Here, the FAX modem 30 logically changes the modem signal 110 due to the noise generated internally when shifting from the normal operating state to the power saving state. This noise is called modem sleep noise, and when modem sleep noise occurs, the modem signal 110 goes from H level to L level, that is, there is an incoming call due to a malfunction even though there is no incoming call. ..

Therefore, the CPU 10 controls the FAX modem 30 during the transition period of the management process, and controls the modem signal 110 output from the FAX modem 30 to be returned from the L level to the H level. This control is called modem clear, and the modem signal 110, which has malfunctioned due to modem sleep noise due to the modem clear, becomes H level and becomes a normal state.

Then, the CPU 10 temporarily clears the detection state of the logical change of the modem signal 110 during the transition period of the monitoring process before the end of the transition period. Similarly, the CPU 20 also temporarily clears the detection state of the logical change of the modem signal 110 during the transition period of the monitoring process before the end of the transition period.

Next, the configuration for detecting the logical change of the modem signal 110 in the CPUs 10 and 20 will be described with reference to FIGS. 4 and 5.

Since the basic configurations of the CPUs 10 and 20 are the same, the CPUs 10 and 20 will be described at the same time in FIGS. 4 and 5.

The CPU 10 has an arithmetic processing unit 11, a detection unit 12, and a register 13, and the CPU 20 has an arithmetic processing unit 21, a detection unit 22, and a register 23.

Note that FIG. 4 is a diagram illustrating a case where the detection units 12 and 22 are set to detect a logical change of the modem signal 110 by edge detection, and FIG. 5 is a diagram illustrating a case where the detection units 12 and 22 are set. However, it is a figure explaining the case where the setting is made to detect the logical change of the modem signal 110 by level detection.

When the detection units 12 and 22 detect the logical change of the modem signal 110 by the set detection method, the detection units 12 and 22 store the detection result in the registers 12 and 23.

Specifically, as shown in FIG. 4, when the detection trigger is set to edge detection, the detection units 12 and 22 detect a falling edge in which the modem signal 110 changes from H level to L level, and the register 12 , 23 stores "1".

Then, as shown in FIG. 5, the detection units 12 and 22 determine the level of the modem signal 110 when the detection trigger is set to level detection, and when the determination result is the L level, the registers 12 and 23 Store "1" in.

Then, the registers 13 and 23 output an L level detection signal when "0" is stored, and output an H level detection signal when "1" is stored.

The arithmetic processing units 11 and 21 can set in software whether to allow or disallow interrupt processing due to the detection signal changing from the L level to the H level. In the following description, as described above, the state in which interrupt processing is permitted is referred to as an Enable state, and the state in which interrupt processing is disabled is referred to as a Disable state.

That is, when the interrupt processing is set to the Enable state and the detection signal is H level, the arithmetic processing units 11 and 21 set the modem signal 110 to L level, that is, the incoming call of the FAX modem 30. The state is detected.

Next, in the image forming apparatus 40 of the present embodiment, the processing when the monitoring processing of the modem signal 110 is transferred from the CPU 10 to the CPU 20 will be described with reference to the flowchart of FIG.

First, in the normal operation mode, as shown in FIG. 2, the CPU 10 is set to the enable state for interrupt detection, and the CPU 20 is set to the disable state for interrupt detection.

Then, when the condition for shifting the image forming apparatus 40 from the normal operation mode to the power saving mode is satisfied, the CPUs 10 and 20 change the detection trigger of the modem signal 110 from edge detection to level detection in step S101.

Then, when the CPU 20 instructs the CPU 10 to shift to the power saving mode, the CPU 10 changes the interrupt detection of the modem signal 110 from the Enable state to the Disable state in step S102.

Then, in step S103, the CPU 10 shifts the FAX modem 30 to the power saving state. At this time, in the FAX modem 30, the modem sleep noise as described above occurs and the modem signal 110 becomes L level.

Therefore, in step S104, the CPU 10 executes a modem clear that returns the modem signal 110 to the H level for the FAX modem 30.

Then, in the CPU 10, the detection signal is cleared in step S105, and in the CPU 20, the detection signal is cleared in step S106.

Then, in step S107, the CPU 20 changes the interrupt detection of the modem signal 110 from the Disable state to the Enable state.

Finally, in step S108, the CPU 20 sets the CPU 10 in the power-off state and completes the transition process.

After that, the CPU 20 executes a process of returning the detection trigger of the modem signal 110 from the level detection to the edge detection.

By executing such a transfer process, the transition process from the normal operation mode as shown in FIG. 2 to the sleep mode as shown in FIG. 3 is completed.

Note that FIG. 7 shows an operation during the transition of the monitoring process from the CPU 10 to the CPU 20 described in the flowchart of FIG.

(1) First, the CPU 20 instructs the CPU 10 to shift to the power saving state. At that time, the CPUs 10 and 20 switch the detection trigger of the modem signal 110 from edge detection to level detection.
(2) Then, the CPU 10 changes the interrupt detection from the Enable state to the Disable state.
(3) Then, when the CPU 10 instructs the FAX modem 30 to shift to the power saving state, the FAX modem 30 is put into the power saving state. At that time, the modem signal 110 changes from H level to L level due to the occurrence of modem sleep noise.
(4) Therefore, the CPU 10 clears the fax modem 30. As a result, the modem signal 110 returns from the L level to the H level.

After that, the respective detection signals are cleared in the CPUs 10 and 20, and the CPU 20 changes the interrupt detection from the Disable state to the Enable state. Then, the power of the CPU 10 is turned off, and the transition of the monitoring process is completed. The CPU 20 returns the detection trigger of the modem signal 110 from level detection to edge detection.

Next, the reason why the detection trigger of the modem signal 110 is switched from edge detection to level detection when the monitoring process of the modem signal 110 is shifted from the CPU 10 to the CPU 20 will be described with reference to the timing charts of FIGS. 8 to 11. To do.

First, FIGS. 8 and 9 show timing charts when the detection trigger of the modem signal 110 is left as edge detection even during the transition of the monitoring process.

FIG. 8 shows a case where there is no incoming call during the transition of the monitoring process, and FIG. 9 shows a case where there is an incoming call during the transition of the management process.

First, the timing chart of FIG. 8 will be described. When the CPU 10 changes the interrupt detection to the Disable state at time T2 and puts the FAX modem 30 into the power saving state at time T4, the modem signal 110 becomes L level due to the modem sleep noise generated in the FAX modem 30. ..

Then, the CPUs 10 and 20 detect the logical change of the modem signal 110, and each detection signal also becomes the detection state, that is, the H level.

After that, at time T5, when the CPU 10 clears the fax modem 30, the modem signal 110 returns to the H level, which is an undetected state.

Then, at time T6, the CPU 10 clears the detection signal, and at time T7, the CPU 20 clears the detection signal.

After that, at time T8, the CPU 20 changes the interrupt detection from the Disable state to the Enable state, and the transition of the monitoring process is completed.

In the timing chart of FIG. 8, no particular problem occurs because there is no incoming call during the transition period.

Next, the timing chart of FIG. 9 will be described. The CPU 10 changes the interrupt detection to the Disable state at time T2.

Then, in FIG. 9, at time T3, the fax modem 30 detects an incoming call from the telephone line 70, so that the modem signal 110 becomes the L level.

Then, the CPUs 10 and 20 detect the logical change of the modem signal 110, and each detection signal also becomes the detection state, that is, the H level.

Then, at time T4, the CPU 10 puts the FAX modem 30 in a power saving state, so that modem sleep noise is generated in the FAX modem 30, but the modem signal 110 is already at the L level, so that no logical change occurs.

After that, at time T5, the CPU 10 clears the modem for the FAX modem 30, but the modem signal 110 temporarily returns to the H level, which is an undetected state, but the modem signal because the incoming call state continues. 110 remains at the L level.

Then, at time T6, the CPU 10 clears the detection signal, and at time T7, the CPU 20 clears the detection signal.

After that, at time T8, the CPU 20 changes the interrupt detection from the Disable state to the Enable state and completes the transition of the monitoring process, but since the detection signal has been cleared at the time T7, the interrupt detection is set to the Enable state. Even so, the CPU 20 cannot detect the incoming call state.

That is, in the timing chart of FIG. 9, the CPU 20 cannot detect the incoming call generated at the time T3 during the transition period after the transition period is completed. Therefore, the image forming apparatus 40 remains in the sleep mode, and the incoming call generated during the transition period is not properly processed.

Next, FIGS. 10 and 11 show timing charts in the image forming apparatus 40 of the present embodiment in which the detection trigger of the modem signal 110 is switched from edge detection to level detection during the transition of the monitoring process.

FIG. 10 shows a case where there is no incoming call during the transition of the monitoring process, and FIG. 11 shows a case where there is an incoming call during the transition of the management process.

First, the timing chart of FIG. 10 will be described. At time T1, the CPUs 10 and 20 perform a process of switching the detection trigger of the modem signal 110 from edge detection to level detection.

Then, when the CPU 10 changes the interrupt detection to the Disable state at the time T2 and puts the FAX modem 30 into the power saving state at the time T4, the modem signal 110 is at the L level due to the modem sleep noise generated in the FAX modem 30. It becomes.

Then, the CPUs 10 and 20 detect the logical change of the modem signal 110, and each detection signal also becomes the detection state, that is, the H level.

After that, at time T5, when the CPU 10 clears the fax modem 30, the modem signal 110 returns to the H level, which is an undetected state.

Then, at time T6, the CPU 10 clears the detection signal, and at time T7, the CPU 20 clears the detection signal. In the flowchart of FIG. 9, since the detection trigger of the modem signal 110 is edge detection at times T6 and T7, once the detection signals of the CPUs 10 and 20 are cleared, they are cleared as they are, that is, in the L level state. Will remain. That is, when a logical change of a certain signal is detected by edge detection, the signal is not detected as a logical change unless level inversion occurs from H level to L level (or vice versa).

After that, the CPU 20 changes the interrupt detection from the Disable state to the Enable state at time T8. Then, at time T9, the CPU 20 changes the detection trigger from level detection to edge detection, and the transition of the monitoring process is completed.

In the timing chart of FIG. 10, since there is no incoming call during the transition period, a large difference from the timing chart shown in FIG. 8 does not occur.

Next, the timing chart of FIG. 11 will be described. At time T1, the CPUs 10 and 20 perform a process of switching the detection trigger of the modem signal 110 from edge detection to level detection. Then, the CPU 10 changes the interrupt detection to the Disable state at the time T2.

Here, in FIG. 11, at time T3, the fax modem 30 detects an incoming call from the telephone line 70, so that the modem signal 110 becomes the L level.

Then, the CPUs 10 and 20 detect the logical change of the modem signal 110, and each detection signal also becomes the detection state, that is, the H level.

Then, at time T4, the CPU 10 puts the FAX modem 30 in a power saving state, so that modem sleep noise is generated in the FAX modem 30, but the modem signal 110 is already at the L level, so that no logical change occurs.

After that, at time T5, the CPU 10 clears the modem for the FAX modem 30, but the modem signal 110 temporarily returns to the H level, which is an undetected state, but the modem signal because the incoming call state continues. 110 remains at the L level.

Then, at time T6, the CPU 10 clears the detection signal, and at time T7, the CPU 20 clears the detection signal. In the timing chart of FIG. 11, since the detection trigger of the modem signal 110 is level detection at times T6 and T7, even if the detection signals of the CPUs 10 and 20 are cleared once, the modem signal 110 is still at the L level. By being present, the detection signal is again in the detection state, that is, the H level state. That is, in the present embodiment, when the logical state of the modem signal 110 is detected by level detection, it is detected that the modem signal 110 has changed from the H level to the L level as long as the modem signal 110 is in the L level state. Because it can be done.

After that, at time T8, the CPU 20 changes the interrupt detection from the Disable state to the Enable state and completes the transition of the monitoring process. At that time, since the detection signal of the CPU 20 is at the H level and the interrupt detection of the CPU 20 is in the Enable state, the CPU 20 can detect that the modem signal 110 is at the L level, that is, the incoming call state. is made of.

That is, in the timing chart of FIG. 11, the CPU 20 can detect the incoming call generated at the time T3 during the transition period after the transition period is completed. Therefore, the image forming apparatus 40 releases the sleep mode, shifts to the normal operation mode, and activates the CPU 10, so that the incoming call generated during the transition period is appropriately processed.

[Modification example]
In the above embodiment, the case where the FAX modem 30 that changes the logic of the output modem signal 110 when the incoming call of the FAX via the telephone line 70 is detected is used has been described, but the present invention is limited thereto. Instead, the present invention can be similarly applied even when a detection unit that changes the logic of the interrupt signal to be output is used when a change in an external factor is detected.

10 Hardware control CPU
11 Arithmetic processing unit 12 Detection unit 13 Register 20 Main CPU
21 Arithmetic processing unit 22 Detection unit 23 Register 30 FAX modem 40 Image forming device 50 Terminal device 60 Network 70 Telephone line 110 Modem signal

Claims (7)

A detector that changes the logic of the interrupt signal that is output when a change in an external factor is detected,
When the logical change of the interrupt signal is detected, the first control unit that controls to execute the process according to the change of the external factor detected by the detection unit, and the first control unit.
When controlling the first control unit and shifting the monitoring process of the logical change of the interrupt signal from the first control unit, the level of the detection method of the logical change of the interrupt signal is detected from edge detection. When the transition period ends after the interrupt processing due to the logical change of the interrupt signal is disallowed in the first control unit, the interrupt process due to the logical change of the interrupt signal is permitted. A second control unit that controls so that processing is executed according to a change in an external factor detected by the detection unit according to the logical state of the interrupt signal.
Information processing device equipped with. The information processing apparatus according to claim 1, wherein the second control unit controls to switch the detection method of the logical change of the interrupt signal from level detection to edge detection after the end of the transition period. The information processing device according to claim 1 or 2, wherein the second control unit temporarily clears the detection state of the logical change of the interrupt signal during the transition period before the end of the transition period. When the operation mode of the own device is switched from the normal operation mode to the power saving mode, the second control unit shifts the monitoring process of the logical change of the interrupt signal from the first control unit, and the above-mentioned The information processing apparatus according to any one of claims 1 to 3, wherein the operation of the first control unit is stopped. The first control unit controls the detection unit to be in a power saving state before the operation is stopped.
The information processing device according to claim 4, wherein the detection unit logically changes the interrupt signal by noise generated inside when shifting from a normal operating state to a power saving state. The second control unit shifts monitoring of the logical change of the interrupt signal from the first control unit, interrupts accompanying the logical change of the interrupt signal are permitted, and the logical change of the interrupt signal. Is detected, the operation mode of the own device is switched from the power saving mode to the normal operation mode, and the first control unit is activated to execute processing according to the change of the external factor detected in the detection unit. The information processing device according to claim 4 or 5. Steps to detect changes in external factors and change the logic of the interrupt signal to be output,
When the first control unit detects a logical change in the interrupt signal, a step of performing control to execute processing according to the detected change in an external factor, and a step of performing control.
In the second control unit that controls the first control unit, when shifting the monitoring process of the logical change of the interrupt signal from the first control unit, the method of detecting the logical change of the interrupt signal is edged. Steps to switch from detection to level detection,
In the second control unit, when the transition period ends after the interrupt processing associated with the logical change of the interrupt signal is disallowed in the first control unit, the interrupt process associated with the logical change of the interrupt signal is completed. With the permission, a step of performing control so that processing according to a change in an external factor detected by the detection unit is executed according to the logical state of the interrupt signal, and
A program that lets your computer run.

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