17.7.1 Control A
| Name: | CTRLA |
| Offset: | 0x00 |
| Reset: | 0x00 |
| Property: | PAC Write-Protection, Write-Synchronized Bits |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| SWRST | |||||||||
| Access | R/W | ||||||||
| Reset | 0 |
Bit 0 – SWRST Software Reset
Writing a zero to this bit has no effect.
Setting this bit to 1 will reset all registers in the GCLK to their initial state after a Power Reset, except for generic clocks and associated Generators that have their WRTLOCK bit in PCHCTRLm set to 1.
Refer to GENCTRLn Reset Value for details on GENCTRLn register reset.
Refer to PCHCTRLm Reset Value for details on PCHCTRLm register reset.
Note:
- When the CTRLA.SWRST is written, the user must poll the SYNCBUSY.SWRST bit to know when the reset operation is complete.
- During a SWRST, access to registers/bits without SWRST are disallowed until the SYNCBUSY.SWRST is cleared by hardware.
| Value | Description |
|---|---|
| 0 | There is no Reset operation ongoing. |
| 1 | A Reset operation is ongoing. |