Patent ID: 6598114
Filing Date: 2003-07-22
Classification: G11C

Abstract:
A method for storing a control data group, the control data group including control data specific to a control for a controlled system, into a flash memory used for a read-only memory of an electronic control unit, the method comprising:providing a predetermined memory block of the flash memory for a storage of the control data group, the control data group including at least one control data requiring an update of contents thereof and at least one updated control data; and allocating a plurality of storage regions to the predetermined memory block of the flash memory in an order of addresses in such a manner that each storage region has a capacity enough for the control data group to be written thereinto, the control data group including the control data requiring the update of the contents thereof is written into one of the storage regions which is data-unwritten and whose address is top in the order of addresses, and at least the updated control data is written into one of the remaining storage regions which is data-unwritten and whose address is top in the order of addresses from among the remaining data-unwritten storage regions each time an update request to update the contents of the control data occurs.