| 摘要 |
PURPOSE:To simplify the circuit, by providing a non-volatile memory for an input/output controller, processing the power restoration of a specific bit patatern for the non-volatile memory at a power failure and using volatile memories for main memory. CONSTITUTION:When an input power supply to a power supply board 4 is failed, a power failure predicting signal 5 is transmitted from the board 4, a processor 1 interrupts the processing during execution at present and performs power failure processing. During the power failure processing, the processor 1 gives a command to the input/output controller 7 and sets a flag, e.g., a flag (50)16 in an RAM 7C. Further, the processor 1 comes to a halt. During the power failure, a power is given to the RAM 7C from a battery 3 and the flag (50)16 remains as set. When the power is restored, the power is applied to the entire device from the board 4, the presence/absence of setting of the flag of the RAM 7C is checked and after the power restoration processing, the processing is transited to the normal processing. |
