rtc configure register
| DG_VDD_DRV_B_SLP | |
| DG_VDD_DRV_B_SLP_EN | |
| BIAS_BUF_IDLE | bias buf when rtc in normal work state |
| BIAS_BUF_WAKE | bias buf when rtc in wakeup state |
| BIAS_BUF_DEEP_SLP | bias buf when rtc in sleep state |
| BIAS_BUF_MONITOR | bias buf when rtc in monitor state |
| PD_CUR_DEEP_SLP | xpd cur when rtc in sleep_state |
| PD_CUR_MONITOR | xpd cur when rtc in monitor state |
| BIAS_SLEEP_DEEP_SLP | bias_sleep when rtc in sleep_state |
| BIAS_SLEEP_MONITOR | bias_sleep when rtc in monitor state |
| DBG_ATTEN_DEEP_SLP | DBG_ATTEN when rtc in sleep state |
| DBG_ATTEN_MONITOR | DBG_ATTEN when rtc in monitor state |