Image forming apparatus and method for controlling image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorHirofumi Yamaguchi
Life of this patent
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Abstract
When a watchdog reset request is input, a power supply controller performs partial reset processing (resetting of a control circuit alone). When restarted by partial reset processing, the control circuit makes a non-volatile memory store a log of the stored contents of a volatile memory. After the log is stored, the control circuit transmits a system reset request to the power supply controller. Based on the system reset request, the power supply controller resets the control circuit, the non-volatile memory, the volatile memory, and reset targets.
Claims9
An image forming apparatus, comprising:
- a printing unit which performs printing;
- a watchdog timer which resets a timer when an initialization signal for initialization is input in a prescribed period and which outputs a watchdog reset request when the initialization signal is not input in the prescribed period;
- a control circuit which inputs the initialization signal to the watchdog timer;
- a non-volatile memory which stores a program;
- a volatile memory to which the program is read;
- and
- a power supply controller which controls supply of electric power to the control circuit, the non-volatile memory, the volatile memory, and reset targets and which, in restarting, resets the control circuit, the non-volatile memory, the volatile memory, and the reset targets,
- wherein
- the power supply controller is connected to the watchdog timer,
- when the watchdog reset request is input, the power supply controller performs partial reset processing in which the control circuit alone is reset,
- when the control circuit is restarted by the partial reset processing, the control circuit makes the non-volatile memory store a log of stored contents of the volatile memory,
- after the log is stored, the control circuit transmits a system reset request to the power supply controller, and
- when the power supply controller receives the system reset request, the power supply controller resets the control circuit, the non-volatile memory, the volatile memory, and the reset targets.
A method for controlling an image forming apparatus, the method comprising:
- inputting an initialization signal to a watchdog timer;
- resetting the watchdog timer when the initialization signal is input in a prescribed period;
- outputting an watchdog reset request when the initialization signal is not input in the prescribed period;
- controlling supply of electric power to a control circuit, a non-volatile memory, a volatile memory, and reset targets;
- resetting the control circuit, the non-volatile memory, the volatile memory, and the reset targets during restarting;
- performing partial reset processing in which the control circuit alone is reset when the watchdog reset request is input;
- making the non-volatile memory store a log of stored contents of the volatile memory when the control circuit is restarted by the partial reset processing;
- transmitting a system reset request after the log is stored;
- and
- resetting the control circuit, the non-volatile memory, the volatile memory, and the reset targets based on the system reset request.
Dependencies are inferred from the claim text.