| 摘要 |
PURPOSE:To store an important program or data by providing system start and stop processing parts, data saving means, volatile storage part to data for system and data for user and auxiliary power supply part to hold the data of two RAMs. CONSTITUTION:A system RAM 107 executes system start and stop processing parts 103 and 104 by a CPU 102 according to the interruption signal or input signal of a main power supply part 101 in an area not to be utilized by a user. The system stop processing part 104 saves data to the system RAM 107 by a data saving means 106 and afterwards, power supply is switched from the main power supply part to an auxiliary power supply part 109. After the switch from the auxiliary power supply part to the main power supply part 101, the system start processing part 103 returns the data, which are saved in the system RAM 107, to the original instable area in a user RAM 108 by a data returning means 105. |
