13.6.1 Control
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |
| Name: | CTRL |
| Offset: | 0x00 |
| Reset: | 0x00 |
| Property: | Write-Protected |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| BKUPCLK | |||||||||
| Access | R/W | ||||||||
| Reset | 0 |
Bit 4 – BKUPCLK Backup Clock Select
This bit is set by hardware when a clock failure is detected.
| Value | Description |
|---|---|
| 0 | The GCLK_MAIN clock is selected for the main clock. |
| 1 | The OSC8M backup clock is selected for the main clock. |