RTC Oscillator Control Register.
| FILTER_EN | Enables analog deglitch filter. |
| IBIAS_SEL | If IBIAS_EN is 1, selects 4x,2x mode. |
| HYST_EN | Enables high current hysteresis buffer. |
| IBIAS_EN | Enables higher 4x,2x current modes. |
| BYPASS | RTC Crystal Bypass |
| SQW_32K | RTC 32kHz Square Wave Output |