| 摘要 |
<p>PURPOSE:To prevent the occurrence of such a fault as a system starting operation is made impossible by cutting off a power supply after finishing a writing process to a file device with an interruption incapable of the mask control. CONSTITUTION:When the cut-off of a power supply part 7 is instructed by a power supply ON/OFF switch 8, just an interruption signal incapable of the mask control is outputted to a control part 1 of a microcomputer and the supply of power is not immediately stopped to the microcomputer. The part 1 receives the interruption signal and finishes a writing job as long as the data are being written into a file device 6. Then the part 1 outputs a power supply cut-off signal to the part 7, and the part 7 receives this signal and stops the supply of power for the first time. As a result, the data are surely assured within the device 6 when an operator cuts off the power supply at an optional time point. Thus it is possible to prevent such a case where a system is not started when a power supply is applied again.</p> |
