Kinetis家族产品提升EEPROM功能

　　To provide enhanced EEPROM functionality， the FlexMemory uses a RAM block （FlexRAM）， a flash

　　block （FlexNVM）， and EEE state machine. When the EEE functionality is enabled， the FlexRAM becomes

　　your EEE memory. The FlexRAM address space is where you access all of your EEE data. When the EEE

　　is accessed， the EEE state machine keeps track of the data and backs it up as data records， stored in some

　　portion of the FlexNVM used as an E-flash. Using a large block of E-flash to back up the data for a smaller

　　amount of EEE data allows the FlexMemory EEE implementation to offer extremely high endurance.

　　The EEE state machine uses 32-bit records to backup data from the EEE into the flash. Sixteen bits of the

　　record are used for the data， and the other sixteen bits are address and status information about the data.

　　The data records are written and erased as needed. This means that if a location within the EEPROM has

　　never been accessed， there will not be a data record for it. This helps to reduce the amount of data that

　　needs to be backed up and can increase the memory enduran