| 摘要 |
PROBLEM TO BE SOLVED: To update control data in order to store a specific control data group (an adjustment value etc.), needed to be rewritten by using a flash memory (FLASH EEPROM). SOLUTION: A plurality of storage areas that are large enough to write the specific control data group are set within one block of the flash memory in the order of an address (A1 to A16). Each storage area is provided with a storing part for identification data (00H and FFH) showing the existence/ absence of writing to the area. When the specific control data group is used, the specific control data group is first read from an area which is one of written areas and is also the last area among the written areas in the order of the address, among the plurality of storage areas. When at least one piece of control data is updated in the specific control data group, the entire specific control data group including control data to be updated and control data not to be updated is written in an area which is one of unwritten areas and is also the lead area in the order of the address among the unwritten area, among the plurality of storage areas. |
