Information processing apparatus and control method for information processing apparatus

• US 9,317,791 B2
• Filed: 01/27/2015
• Issued: 04/19/2016
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamasaki, Shozo
• Primary Examiner(s): Grant, II, Jerome
• Application Number:
  US14/606,945
• Publication Number:
  US 20150213346A1
• Time in Patent Office: 448 Days
• Field of Search: 358/1.14, 358/468, 358/400, 358/401, 358/500
• US Class Current: 1/1
• CPC Class Codes: G03G 15/00 Apparatus for electrographic processes using a charge pattern G03G16/00, G03G17/00 take precedence ; xerographic printers for data processors per se G06K15/14
• CPC Class Codes: G03G 15/5012 Priority interrupt; Job recovery, e.g. after jamming or malfunction
• CPC Class Codes: G03G 15/55 Self-diagnostics; Malfunction or lifetime display
• CPC Class Codes: G06F 1/00 Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00 architectures of general purpose stored program computers G06F15/76
• CPC Class Codes: G06F 1/3237 by disabling clock generation or distribution
• CPC Class Codes: G06F 1/3284 Power saving in printer
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: G06K 15/4055 Managing power consumption, e.g. standby mode computer driven power saving management for a printer G06F3/1221; power saving in a data processing device in general G06F1/32
• CPC Class Codes: G06K 15/408 Handling exceptions, e.g. faults computer driven error handling and recovery for a printer G06F3/1234
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

An information processing apparatus includes a first control unit that outputs a command for driving an electric part, a detection unit that detects an abnormality of the first control unit, and a second control unit that controls whether or not supply of a drive signal based on the command for driving the electric part to the electric part can be performed, in which the first control unit outputs instruction signals for instructing execution and stop of the detection by the detection unit, and the second control unit cuts off the supply of the drive signal to the electric part in a case where the detection unit detects the abnormality of the first control unit and a case where the instruction signal for instructing the stop of the detection by the detection unit is output from the first control unit.

Claims

1. An information processing apparatus comprising:

a control unit that outputs a pattern signal for driving an electric part;

a monitoring unit that monitors a state of the control unit and outputs, based on the state of the control unit, a reset signal for stopping the pattern signal from being output to the electric part; and

a control circuit that receives the pattern signal from the control unit and outputs the pattern signal to the electric part,

wherein the control unit outputs an enable signal for preventing the monitoring unit from outputting the reset signal, and

wherein the control circuit stops outputting the pattern signal to the electric part in a case where the reset signal is input to the control circuit and in a case where the enable signal is input to the control circuit.

2. The information processing apparatus according to claim 1,

wherein a power state of the information processing apparatus includes a power saving state,

wherein the control unit outputs the enable signal when a condition for shifting the power state to the power saving state is established, and

wherein the control circuit stops outputting the pattern signal to the electric part in a case where the enable signal is input to the control circuit.

3. The information processing apparatus according to claim 2,

wherein the control unit includes a CPU, and

wherein a clock of the CPU is stopped in the power saving state.

4. The information processing apparatus according to claim 1, wherein the monitoring unit detects that the control unit is not abnormal in a case where a repeating signal cyclically output from the control unit is input and detects that the control unit is abnormal in a case where the repeating signal is not input.

5. The information processing apparatus according to claim 1,

wherein the monitoring unit outputs the reset signal in a case where the monitored state of the control unit is abnormal.

6. The information processing apparatus according to claim 1, wherein the monitoring unit is a watchdog timer.

7. The information processing apparatus according to claim 1, wherein the control circuit includes a D flip-flop, a two-input logical OR operation circuit and another two-input logical OR operation circuit.

8. The information processing apparatus according to claim 7, wherein the reset signal is input to the D flip-flop.

9. The information processing apparatus according to claim 7, wherein the enable signal is input to the two-input logical OR operation circuit.

10. The information processing apparatus according to claim 1, wherein the electric part is a reading unit.

11. A control method for an information processing apparatus, the information processing apparatus having a control unit and a control circuit, the control method comprising:

outputting from the control unit a pattern signal for driving an electric part;

monitoring state of the control unit and outputting, based on the state of the control unit, a reset signal for stopping the pattern signal from being output to the electric part; and

receiving at the control circuit the pattern signal, and outputting from the control circuit the pattern signal to the electric part,

wherein the outputting from the control unit includes outputting an enable signal for preventing the outputting of the reset signal, and

wherein the outputting of the pattern signal from the control circuit to the electric part is stopped by the control circuit in a case where the enable signal is input to the control circuit.