| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce abnormal operation when a backup power supply fails in the case of storing separate pieces of setting information in a built-in SRAM and external SRAMs. <P>SOLUTION: A backup battery (107) supplies a built-in SRAM (103) and external SRAMs (104 to 106) with voltage for holding data. The built-in SRAM (103) and the external SRAMs (104 to 106) store the pieces of setting information which depend unilaterally or mutually. When a system controller (102) detects illegality in data held in the built-in SRAM (103), the system controller (102) deletes the pieces of setting information in the built-in SRAM (103) and also deletes the pieces of setting information in the external SRAMs(104 to 106) storing the pieces of setting information depending on those in the built-in SRAM (103). <P>COPYRIGHT: (C)2013,JPO&INPIT |
