| 摘要 |
PURPOSE:To automatically turn off a power source at the time of falling of a system stop means to some abnormality state by judging the system stop means to be abnormal to request power-off at the time of elapse of a maximum time required for saving of all contents of a main storage area. CONSTITUTION:A loop monitor means 11 uses a timer function to request reset of a counter 13 of a WDT control means 12 at intervals of a certain time, and the WDT control means 12 resets the counter 13; and when the counted value of the counter 13 exceeds a certain value, the means 12 detects looping of a system program. A system stop means 14 is operated in the highest execution priority level in the system program, and this means 14 saves all contents of the main storage area and requests power-off in response to the detection report from the WDT control means 12. A system stop monitor means 17 requests power-off when a maximum time required for saving of all contents of the main storage area elapses. Thus, the power source is automatically turned off though the system stop means 14 falls to a loop. |
