configure power register
| BIAS_BUF_IDLE | open bias buf when system in active |
| BIAS_BUF_WAKE | open bias buf when rtc in wakeup |
| BIAS_BUF_DEEP_SLP | open bias buf when rtc in deep sleep |
| BIAS_BUF_MONITOR | open 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 |
| ENB_SCK_XTAL | ENB_SCK_XTAL |
| INC_HEARTBEAT_REFRESH | INC_HEARTBEAT_REFRESH |
| DEC_HEARTBEAT_PERIOD | DEC_HEARTBEAT_PERIOD |
| INC_HEARTBEAT_PERIOD | INC_HEARTBEAT_PERIOD |
| DEC_HEARTBEAT_WIDTH | DEC_HEARTBEAT_WIDTH |
| RST_BIAS_I2C |