Processing device

Abstract

To provide a processor that appropriately controls power supply to an integrated circuit.SOLUTION: A processor comprises: an integrated circuit; a power supply unit that is connected with an external power supply and supplies power to the integrated circuit; and a power supply switch that switches the state of the processor based on the power supplied from the power supply unit. The integrated circuit includes control means that controls the power state of the integrated circuit in a state where the power supply unit supplies power to the integrated circuit.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a processing apparatus having an integrated circuit capable of processing jobs.

Background Art

[0002] Generally, in network devices including a recording apparatus, even in the power saving mode, an integrated circuit such as an ASIC operates and often continues some processing. For the purpose of further power saving, most or all of the functions of the integrated circuit may be restricted. Patent Document 1 describes a configuration for reducing power consumption by stopping the power supply to a controller in the power saving mode of the device.

[0003] In Patent Document 1, power consumption is reduced by stopping the power supply to the controller in the power saving mode of the device. And in Patent Document 1, while the device is in the power saving mode, when a detection circuit detects an operation of an input by a user, the power supply supplies power to the controller, and a latch circuit operates to continue the power supply. Also, for an operation of a user input to shift to the power saving mode, the controller disables the latch circuit.

[0004] By the way, it is known that a recording apparatus has a function of shifting to a state where it can process a request when it receives an external job request while an AC power supply is turned on and the main body power switch is OFF.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Patent Document 1 describes that power supply to a controller is started in response to an operation of an input by a user. However, Patent Document 1 does not mention controlling power supply to an integrated circuit such as a controller according to the setting of the above-described function of the recording device when an AC power supply is turned on.

[0007] An object of the present invention is to provide a processing device that appropriately controls power supply to an integrated circuit.

Means for Solving the Problems

[0008] To solve the above problems, a processing device according to the present invention is a processing device, including an integrated circuit that operates as a controller for comprehensively controlling the inside of the processing device, The processing device connected to an external power supply by which , inside the processing device a power supply unit that supplies power to the the power switch and connected to the integrated circuit and the power supply unit is , a signal generation circuit including a latch circuit, wherein the latch circuit a power switch that switches the state of the processing device based on the power supplied from the power supply unit, a signal generation circuit that outputs to the power supply unit generates a first signal for causing the power supply unit to supply power to the integrated circuit in a first state and a second signal for stopping the power supply from the power supply unit to the integrated circuit in a second state outputs to the power supply unit and transitions between performs the the following, a storage unit that stores user settings; and is provided with the latch circuit is held in the first state when the processing device is connected to the external power supply, wherein the integrated circuit when power is supplied from the power supply unit to the integrated circuit based on the first signal, if the user setting is the first setting, sends a signal for setting the latch circuit to the second state to the signal generation circuit outputs, and if the user setting is the second setting, controls the state of the integrated circuit to transition to a sleep mode with lower power consumption than the normal operation mode in which power is supplied from the power supply unit to the integrated circuit and includes control means, , the latch circuit is transitioned from the first state to the second state and held based on a signal for setting the latch circuit to the second state, and is transitioned from the second state to the first state and held based on the operation of the power switch in the second state which is characterized by the above.

Advantages of the Invention

[0009] According to the present invention, power supply to an integrated circuit can be appropriately controlled.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, not all of these plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Furthermore, in the accompanying drawings, the same or similar configurations are given the same reference numerals, and redundant explanations are omitted.

[0012] FIG. 1 is a diagram showing an example of a schematic configuration of a recording system including a recording apparatus 112 and a host PC 104 which is an external device in the present embodiment. FIG. 1 mainly shows a block configuration related to the operation of the present embodiment. Power is supplied from an AC power source 101 which is an external power source to a power supply unit 102 of the recording apparatus 112 through an AC cable or the like, and the power supply unit 102 supplies power to each unit including an integrated circuit 103. In the present embodiment, the integrated circuit 103 is configured by, for example, an ASIC (Application Specific Integrated Circuit), and includes peripheral functions such as a CPU, a memory, and a timer inside, and operates as a controller that comprehensively controls the inside of the recording apparatus 112. Further, in the present embodiment, the integrated circuit 103 is described as an ASIC, but other forms of integrated circuits such as an FPGA may be used. Further, in the present embodiment, the recording apparatus 112 that performs recording on a recording medium is described as an example, but as long as the control operation of the power state of the integrated circuit 103 in the present embodiment can be realized, the apparatus on which the integrated circuit 103 is mounted does not have to be a recording apparatus. For example, it may be an information processing apparatus having a general-purpose PC configuration instead of a recording apparatus.

[0013] Control commands and recording data transmitted from the host PC 104 are received by an interface (I / F) circuit 105. Note that the connection between the host PC 104 is configured by a wired communication network, a wireless communication network, and a network including both of them. The host PC 104 may be a portable terminal such as a smartphone as long as it can transmit a job to the recording apparatus 112. The I / F circuit 105 has a configuration corresponding to the network medium between the host PC 104. With respect to the recording data received by the I / F circuit 105, the integrated circuit 103 executes, for example, image processing and expands it in a RAM 106. A ROM 107 stores a program for the integrated circuit 103 to operate and various tables necessary for controlling a recording head 108. Further, as will be described later, the ROM 107 operates as a storage unit that stores user settings related to the power state to which the recording apparatus 112 transitions when the AC power source 101 is turned on.

[0014] The recording head 108 has nozzles for ejecting ink droplets of each color, such as cyan, magenta, yellow, and black, onto a recording medium such as a sheet. The recording head 108 is, for example, a so-called serial type recording head that ejects ink droplets while reciprocatingly scanning in a direction orthogonal to the conveyance direction of the recording medium. Also, the recording head 108 may be a so-called line type recording head in which a nozzle array is formed across the width region of the recording medium. During the recording operation, the integrated circuit 103 controls the recording head 108 to perform recording on the recording medium based on a table or the like stored in the ROM 107.

[0015] The display unit 109 includes a panel or the like and can display various user interface screens. The display of the display unit 109 is controlled by the integrated circuit 103. Also, the display unit 109 may include hard keys, soft keys, etc. and be configured to receive user operations. Also, although not shown in FIG. 1, an operation unit for receiving user operations may be provided separately.

[0016] The main body power switch 111 is a power switch operable by the user and is configured, for example, as a self - reset type switch whose contacts change only when pressed. The main body power switch 111 switches the recording apparatus 112 from the power - off state to the standby state, or from the standby state and other operating states to the power - off state, in response to a user operation. Here, the standby state refers to a state of the recording apparatus 112 in which power is supplied to the integrated circuit 103 and the display unit 109, and user operations and jobs can be processed. The power - saving circuit 110 is connected to the power supply unit 102, the integrated circuit 103, and the main body power switch 111, and their configurations will be described later.

[0017] FIG. 2 is a diagram showing an example of the configuration related to the power control of the recording apparatus 112. In FIG. 2, the power saving circuit 110 and its peripheral configuration are shown. The power saving circuit 110 includes a latch circuit 201 and a switch detection circuit 202. When power is supplied from the AC power supply 101 to the power supply unit 102, the power supply unit 102 can supply power to the integrated circuit 103, the latch circuit 201, and the switch detection circuit 202. The latch circuit 201, which will be described later, includes an NPN transistor and a PNP transistor, and is a circuit that performs an operation of maintaining an output for a certain input. The power supply unit 102 includes a power output switch 203 and can selectively switch the on / off of the power output to the integrated circuit 103.

[0018] As a power control function, when the recording apparatus 112 receives a job request from the host PC 104 in a state where the AC power supply 101 is turned on and the main body power switch 111 is not operated (power off state), the recording apparatus 112 has a function of transitioning to a state where the request can be processed. Hereinafter, such a power control function is referred to as an "auto power-on function". The enable / disable of such an "auto power-on function" can be set by user settings. In the present embodiment, the state transition that occurs when the AC power supply 101 is turned on is different between the case where the "auto power-on function" is set to be enabled and the case where it is set to be disabled.

[0019] Here, the state transition of the recording apparatus 112 that occurs when the AC power supply 101 is turned on will be described for each case where the "auto power-on function" is set to be enabled and the case where it is set to be disabled.

[0020] FIG. 6 is a diagram for explaining the state transition of the recording apparatus 112. FIG. 6 shows the state transition from when the AC power supply 101 is turned on (AC on) until the recording apparatus 112 transitions to the standby state. When the AC power supply 101 is turned on in the state 601 where the AC power supply 101 is off, the recording apparatus 112 transitions to the state 602. In the state 602, power is supplied to the integrated circuit 103. Here, when power is supplied to the integrated circuit 103, it temporarily enters the normal operation mode. The integrated circuit 103 refers to the user settings regarding the "automatic power-on function" stored in the ROM 107.

[0021] When the "automatic power-on function" is set to be enabled as a user setting, the recording apparatus 112 transitions to the state 603. In the state 603, the integrated circuit 103 is in the sleep mode. The sleep mode is a state in which the integrated circuit 103 can process jobs, but restricts some functions such as peripheral functions to suppress power consumption. When the main power switch 111 is operated in the state 603, the integrated circuit 103 returns from the sleep mode to the normal operation mode, and the recording apparatus 112 transitions to the standby state 605.

[0022] On the other hand, when the "automatic power-on function" is set to be disabled as a user setting, the recording apparatus 112 transitions to the state 604. In the state 604, the supply of power to the integrated circuit 103 is stopped. When the main power switch 111 is operated in the state 604, the integrated circuit 103 enters the normal operation mode when power is supplied, and transitions to the standby state 605.

[0023] As described above, in this embodiment, when the AC power supply 101 is turned on, power is supplied to the integrated circuit 103 of the recording apparatus 112. When the "automatic power-on function" is set to "enabled", the integrated circuit 103 enters the sleep mode to make itself in a state where it can process jobs, and the power consumption of the recording apparatus 112 is suppressed. When the main power switch 111 is operated, the integrated circuit 103 returns from the sleep mode to the normal operation mode, and the recording apparatus 112 enters the standby state. On the other hand, when the "automatic power-on function" is set to "disabled", the power supply to the integrated circuit 103 is stopped, and the power consumption of the recording apparatus 112 is further suppressed. When the main power switch 111 is operated, power is supplied to the integrated circuit 103, the integrated circuit 103 enters the normal operation mode, and the recording apparatus 112 enters the standby state.

[0024] Referring again to FIG. 2, the ROM 107 stores user settings regarding the "automatic power-on function". In the state 603 of FIG. 6, the power supply unit 102 supplies power to the integrated circuit 103, the latch circuit 201, and the switch detection circuit 202. When power is supplied, the integrated circuit 103 enters the sleep mode. At this time, the power supply to the recording head 108 and the display unit 109 is stopped. When the switch detection circuit 202 detects the operation of the main power switch 111, the switch detection circuit 202 sends a signal to the integrated circuit 103, and the integrated circuit 103 returns itself from the sleep mode to the normal operation mode.

[0025] When in state 604 of FIG. 6, the power supply unit 102 supplies power to the latch circuit 201 and the switch detection circuit 202. At this time, the power supply to the integrated circuit 103, the recording head 108, and the display unit 109 is stopped. When transitioning to state 604, the integrated circuit 103 sends a signal to the power supply unit 102 via the latch circuit 201. Thereafter, the power output switch 203 is switched, and the power supply to the integrated circuit 103 is stopped. Since the latch circuit 201 holds the above signal, the stop of the power supply to the integrated circuit 103 is maintained. When the switch detection circuit 202 detects the operation of the main body power switch 111, the switch detection circuit 202 sends a signal to the power supply unit 102 via the latch circuit 201. Thereafter, the power output switch 203 is switched, power is supplied to the integrated circuit 103, and the integrated circuit 103 enters the normal operation mode.

[0026] FIG. 3 is a diagram showing an example of a circuit configuration related to the power control function of the recording apparatus 112. The power supplies output by the power supply unit 102 include a power supply Vcc (constant) 310 that is always output when the AC power is on and a power supply Vcc 311, and these two power supplies are switched by the power output switch 203. The latch circuit 201 includes an NPN transistor 301 and a PNP transistor 302. The power supply unit terminal 307 is configured as an internal pull-up. When the NPN transistor 306 is off, the output of the power supply unit terminal 307 becomes High by the internal pull-up and outputs the power supply Vcc 311. On the other hand, when the NPN transistor 306 is on, the output of the power supply unit terminal 307 becomes Low and the power supply Vcc 311 is stopped.

[0027] When the AC power supply 101 is turned on, since the NPN transistor 306 is off, the power supply unit 102 outputs the power supply Vcc 311, power is supplied to the integrated circuit 103, and the integrated circuit 103 enters the normal operation mode.

[0028] When transitioning from state 602 to state 604, that is, when the "automatic power-on function" is set to "disabled" as a user setting, the integrated circuit 103 sets the level of terminal 308 to High. When the level of terminal 308 becomes High, the NPN transistor 303 turns on. When the NPN transistor 303 turns on, the PNP transistor 302 turns on, and the NPN transistor 301 also turns on. As a result, the on state of the PNP transistor 302 and the NPN transistor 301 is maintained, and the latch circuit 201 becomes enabled. When the latch circuit 201 becomes enabled, the NPN transistor 306 turns on with its base terminal fixed at High, the output of the power supply unit terminal 307 becomes Low, and the power supply to the integrated circuit 103 is stopped.

[0029] When the main power switch 111 is operated in state 604, the NPN transistor 305 turns on when its base terminal becomes High. When the NPN transistor 305 turns on, the NPN transistor 301 turns off when its base terminal becomes Low. When the NPN transistor 301 turns off, the PNP transistor 302 turns off when its base terminal becomes High. As a result, the latch circuit 201 becomes disabled. When the latch circuit 201 becomes disabled, the NPN transistor 306 turns off with its base terminal fixed at Low. Then, the output of the power supply unit terminal 307 becomes High by internal pull-up, and the power supply to the integrated circuit 103 is resumed. And the integrated circuit 103 enters the normal operation mode, and the recording device 112 transitions to state 605.

[0030] In this way, when the "automatic power-on function" is set to "disabled" as a user setting, the latch circuit 201 is enabled by the output control of the terminal 308 of the integrated circuit 103, and as a result, the power supply to the integrated circuit 103 is stopped. And when the main power switch 111 is operated, the latch circuit 201 is disabled, and as a result, the power supply to the integrated circuit 103 is resumed, and the integrated circuit 103 enters the normal operation mode.

[0031] When transitioning from state 602 to state 603, that is, when the "auto power-on function" is set to "enabled" as a user setting, the integrated circuit 103 enters the sleep mode by restricting some functions such as peripheral functions. When the main power switch 111 is operated in state 603, the NPN transistor 304 turns on because the base terminal becomes High. As a result, the level of terminal 309 of the integrated circuit 103 becomes Low. When the integrated circuit 103 detects the Low level of terminal 309, it releases the function restriction and returns from the sleep mode to the normal operation mode, and the recording device 112 transitions to state 605.

[0032] As described above, when the "auto power-on function" is set to "enabled" as a user setting, the integrated circuit 103 enters the sleep mode. Then, when the main power switch 111 is operated, the level of terminal 309 of the integrated circuit 103 becomes Low, and the integrated circuit 103 returns from the sleep mode to the normal operation mode.

[0033] In this embodiment, as described above, the latch circuit 201 operates as a signal generation circuit that generates a signal for controlling the power supply to the integrated circuit 103 based on the function of the latch circuit including transistors.

[0034] Figure 4 is a flowchart showing the processing from when the AC power supply 101 is turned on until the recording device 112 transitions to the standby state. When the AC power supply 101 is turned on in S401, in S402, as described with reference to FIG. 3, the power supply Vcc311 is supplied to the integrated circuit 103, and the integrated circuit 103 temporarily enters the normal operation mode.

[0035] In S403, the integrated circuit 103 refers to the user setting regarding the "auto power-on function" stored in the ROM 107 and determines whether the "auto power-on" function is set to "enabled" or "disabled". If it is determined that the "auto power-on" function is set to "enabled", the process proceeds to S409. If it is determined that the "auto power-on function" is set to "disabled", the process proceeds to S404.

[0036] In S409, the integrated circuit 103 puts itself into the sleep mode. Then, in S410, the integrated circuit 103 determines whether the main body power switch 111 has been operated based on the level change of the terminal 309. The process of S410 is repeated until it is determined that the main body power switch 111 has been operated. If it is determined that the main body power switch 111 has been operated, for example, when the integrated circuit 103 detects the Low of the terminal 309, in S411, the integrated circuit 103 returns from the sleep mode to the normal operation mode. After that, in S408, the integrated circuit 103 transitions the recording device 112 to the standby state. Then, the process of FIG. 4 ends.

[0037] Thus, when the AC power supply 101 is turned on, the integrated circuit 103 enters the sleep mode after entering the normal operation mode. That is, when the "automatic power-on function" is set to "enabled", the integrated circuit 103 is made capable of processing jobs, and power consumption is suppressed. Then, when the main body power switch 111 is operated by the user, the integrated circuit 103 returns from the sleep mode to the normal operation mode, and the recording device 112 enters the standby state.

[0038] If it is determined in S403 that the "automatic power-on function" is set to "disabled", in S404, the integrated circuit 103 enables the latch circuit 201 by setting the level of the terminal 308. As a result, in S405, as described in FIG. 3, the power supply to the integrated circuit 103 is stopped. After S405, when the main body power switch 111 is operated in S406, in S407, the switch detection circuit 202 disables the latch circuit 201 as described in FIG. 3. As a result, the power supply to the integrated circuit 103 is resumed, and the integrated circuit 103 enters the normal operation mode. Then, in S408, the integrated circuit 103 transitions the recording device 112 to the standby state. Then, the process of FIG. 4 ends.

[0039] Thus, when the AC power supply 101 is turned on, after the integrated circuit 103 enters the normal operation mode, the power supply to the integrated circuit 103 is stopped. That is, when the "automatic power-on function" is set to "invalid", the power supply to the integrated circuit 103 is stopped, further suppressing power consumption and suppressing leakage current from the integrated circuit 103. Then, when the main power switch 111 is operated by the user, the latch circuit 201 is disabled, so that the power supply to the integrated circuit 103 is resumed, the integrated circuit 103 enters the normal operation mode, and the recording device 112 enters the standby state.

[0040] FIG. 5(a) is a flowchart showing the processing when the power supply to the power supply unit 102 is cut off when the recording device 112 is in state 603, that is, when the integrated circuit 103 is in the sleep mode. Here, the case where the power supply to the power supply unit 102 is cut off means, for example, when a power outage occurs or when the AC cable is pulled out by the user.

[0041] In S501, when the power supply to the power supply unit 102 is cut off, in S502, the power supply Vcc (constant) 310 and the power supply Vcc 311 are turned off, and the processing in FIG. 5(a) ends. In this embodiment, as long as the integrated circuit 103 does not set the level of the terminal 308, the latch circuit 201 is in the disabled state. Therefore, in S502, the integrated circuit 103 is in the disabled state. Accordingly, next, when the AC power supply 101 is turned on, the power supply to the integrated circuit 103 is supplied, and the processing after S402 in FIG. 4 is executed.

[0042] FIG. 5(b) is a flowchart showing the processing when the power supply to the power supply unit 102 is cut off when the recording device 112 is in state 604, that is, when the power supply to the integrated circuit 103 is stopped. Here, the case where the power supply to the power supply unit 102 is cut off means, for example, when a power outage occurs or when the AC cable is pulled out by the user.

[0043] In S511, when the power supply to the power supply unit 102 stops, in S512, the power supplies Vcc (constant) 310 and Vcc 311 turn off. In S511, since the power supply to the integrated circuit 103 has stopped, the latch circuit 201 is in an enabled state. However, when the power supplies Vcc (constant) 310 and Vcc 311 turn off, the PNP transistor 302 and the NPN transistor 301 turn off because the collector-emitter potential difference disappears, and the latch circuit 201 becomes disabled (S513). Therefore, next, when the AC power supply 101 is turned on, the power supply to the integrated circuit 103 is supplied, and the processes after S402 in FIG. 4 are executed.

[0044] As described above, according to the present embodiment, even when the power supply to the power supply unit 102 is cut off in either of the states 603 and 604, the latch circuit 201 becomes disabled. As a result, next, when the AC power supply 101 is turned on, the power supply to the integrated circuit 103 is supplied, and thereafter, appropriate power supply control to the integrated circuit 103 is performed according to the setting content of the "automatic power-on function".

[0045] The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiment to a system or device via a network or a storage medium, and having one or more processors in a computer of the system or device read and execute the program. Further, it can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

[0046] The invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the claims are attached to disclose the scope of the invention.

Explanation of Reference Numerals

[0047] 101 AC power supply: 102 Power supply unit: 103 Integrated circuit: 110 Power saving circuit: 111 Main body power switch: 112 Recording device

Claims

1. A processing device, an integrated circuit that operates as a controller for comprehensively controlling the interior of the processing device, a power supply unit that supplies power to the interior of the processing device when the processing device is connected to an external power supply, a power switch that switches the state of the processing device based on the power supplied from the power supply unit, a signal generation circuit including a latch circuit connected to the integrated circuit, the power supply unit, and the power switch, wherein the latch circuit transitions between a first state in which a first signal for causing the power supply unit to supply power to the integrated circuit is output to the power supply unit and a second state in which a second signal for stopping the power supply from the power supply unit to the integrated circuit is output to the power supply unit, a storage unit that stores user settings, comprising: the latch circuit is held in the first state when the processing device is connected to the external power supply, when power is supplied from the power supply unit to the integrated circuit based on the first signal, if the user setting is a first setting, the integrated circuit outputs a signal for setting the latch circuit to the second state to the signal generation circuit, and if the user setting is a second setting, control means for controlling the state of the integrated circuit to transition to a sleep mode with lower power consumption than the normal operation mode in which power is supplied from the power supply unit to the integrated circuit, the latch circuit transitions from the first state to the second state and is held based on a signal for setting the latch circuit to the second state, and transitions from the second state to the first state and is held based on the operation of the power switch in the second state, characterized in that it is a processing device.

2. when power is supplied from the power supply unit to the integrated circuit based on the first signal, if the user setting is the first setting, the control means outputs a signal for setting the latch circuit to the second state to the signal generation circuit, the latch circuit transitions from the first state to the second state based on a signal for setting the latch circuit to the second state and outputs the second signal to the power supply unit, the power supply unit stops supplying power to the integrated circuit based on the second signal output from the latch circuit, characterized in that it is the processing device according to Claim 1.

3. Based on the operation of the power switch in the second state, the latch circuit transitions from the second state to the first state and outputs the first signal to the power supply unit. Based on the first signal output from the latch circuit, the power supply unit resumes power supply to the integrated circuit. The processing device according to claim 2, characterized in that.

4. When the external power supply is cut off while the power supply to the integrated circuit is stopped, the latch circuit transitions from the second state to the first state, according to any one of claims 1 to 3. The processing device described in the item.

5. When the external power supply is turned on again after the external power supply is cut off, based on the fact that the latch circuit has transitioned from the second state to the first state, power is supplied from the power supply unit to the integrated circuit. The processing device according to claim 4, characterized in that.

6. The control means sets the level of the base terminal of the transistor included in the latch circuit as an output of a signal for setting the latch circuit to the second state to the signal generation circuit, according to any one of claims 1 to 5. The processing device described in the item.

7. The processing device according to claim 6, characterized in that the level of the base terminal of the transistor included in the latch circuit is set by operating the power switch.

8. When the user setting is the second setting, after the integrated circuit has transitioned to the sleep mode, based on the operation of the power switch, the control means sets the state of the integrated circuit to the normal operation mode. The processing device according to any one of claims 1 to 7, characterized in that it is transitioned.

9. The integrated circuit can process jobs in both the normal operation mode and the sleep mode, according to any one of claims 1 to 8. The processing device described in the item.

10. The processing device according to claim 9, further comprising recording means for recording on a recording medium based on the job.

11. A processing device, An integrated circuit that operates as a controller for comprehensively controlling the inside of the processing device; A power supply unit that supplies power to the inside of the processing device when the processing device is connected to an external power supply; A power switch that switches the state of the processing device based on the power supplied from the power supply unit; A signal generation circuit including a latch circuit, connected to the integrated circuit, the power supply unit, and the power switch, wherein the latch circuit transitions between a first state in which a first signal for causing the power supply unit to supply power to the integrated circuit is output to the power supply unit and a second state in which a second signal for stopping the power supply from the power supply unit to the integrated circuit is output to the power supply unit. A storage unit for storing user settings. Comprising: The latch circuit is held in the first state when the processing device is connected to the external power supply. When power is supplied from the power supply unit to the integrated circuit based on the first signal, if the user setting is the first setting, the integrated circuit outputs a signal for setting the latch circuit to the second state to the signal generation circuit. If the user setting is the second setting, control means is provided for controlling the state of the integrated circuit to transition to a sleep mode with lower power consumption than the normal operation mode in which power is supplied from the power supply unit to the integrated circuit. The latch circuit transitions from the first state to the second state and is held based on a signal for setting the latch circuit to the second state. Based on the operation of the power switch in the second state, the latch circuit transitions from the second state to the first state and is held. When the external power supply is cut off in a state where power supply to the integrated circuit is stopped, the latch circuit transitions from the second state to the first state. When the external power supply is turned on again after the external power supply is cut off, power is supplied from the power supply unit to the integrated circuit based on the fact that the latch circuit has transitioned from the second state to the first state. A processing device characterized by the above.

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