BBFC Battery Backed Function Control Register. 0x40005800 0x00 0x400 registers BBFCR0 Register 0. 0x00 read-write CKPDRV Hyperbus CK Drive Setting. 0 4 CKNPDRV Hyperbus CKN Drive Setting. 4 4 RDSDLLEN Hyperbus RDS DLL Enable. 8 1 dis 0 en 1