GCFR Global Control Function Register. 0x40005800 0x00 0x400 registers REG0 Register 0. 0x00 read-write ISO_WUP ISO Warm Up Value. 0 9 IPO_WUP IPO Warm Up Value. 16 11 REG1 Register 1. 0x04 read-write ERFO_WUP ERFO Warm Up Value. 0 14 IBRO_WUP IBRO Warm Up Value. 16 6