| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve reliability of a program update function for completing update after power supply recovery even when power supply is interrupted during the update. <P>SOLUTION: In program update for modifying a part of a program embedded in an electronic appliance, while the electronic appliance is operable by power from a first power supply, a block as a part of the program is rewritten on the basis of the differential data, information indicating the progress of overwrite is stored in a memory circuit which has a second power source and a memory and performs read/write operation to a memory by power from the second power supply, overwrite of a part of the program interrupted due to interruption of power supply from a first power supply is restarted from an incomplete stage on the basis of information stored in the memory circuit when power supply from the first power supply is restarted. <P>COPYRIGHT: (C)2011,JPO&INPIT |
