IVREF and DVREG setting register
| VDD_PMU_SET_PDM | Vdd_pmu while in power down |
| VDD_PMU_SET | Vdd_pmu while wakeup |
| VDD_MEM_SET_PDM | Vdd_mem while in power down mode |
| VDD_MEM_SET | Vdd_mem while wakeup |
| VDD_PMU_SET_EXTRA | extra high setting for vdd_pmu |
| VDD_MEM_SET_EXTRA | extra high setting for vdd_mem |
| VDD_PMU_SET_ULTRA_LOW | ultra low setting for vdd_pmu |
| VDD_PMU_MEM_SW | 1 to close the switch betwwen vdd_omu and vdd_mem |
| IV_BG_SEL | VBG voltage select- |
| PDM_DIS_BUCK | 1 to power off buck in power down mode |
| BUCK_PD_CCM | 0 buck in CCM mode |
| BUCK_PD_DCM | 0 buck in DCM mode |
| IV_IREF_SEL | Reference current select |
| IV_VREG11_SET | VREG11 setting |
| XTAL32K_FORCE_RDY | Xtal32k ready from register |
| X32_SMT_EN | 1 to enable schmidt trigger in xtal32 |
| BM_X32BUF | Xtal 32 buffer current bias |
| DVREG11_SET_DIG | Vregd set |
| BUCK_DPD | ZC control select |