40.5.10 Idle and Standby Sleep Modes Operation
The host device supports several modes of operation, starting at Active and ending with Off:
| Mode of Operation: | Behavior: | Wake-Up Signal: |
|---|---|---|
| Active | CPU running. All memory is active. ADC can run. | None |
| (CPU) Idle | CPU halted. All memory is active. ADC (1) | All Interrupts |
| Standby | All logic content retained. ADC (1) NVM in sleep mode. Configurable RAM retention support. | All Interrupts |
| Hibernate | Only backup domain remains active.
ADC cannot run. Configurable RAM retention. Only 32 kHz clock can run. | Backup Interrupts |
| Backup | Only backup domain remains active.
ADC cannot run. Only 32 kHz clock can run. | Backup Interrupts |
| Off | Everything is off. | External Reset |
Note:
- The CTRLA.ONDEMAND and CTRLA.RUNSTDBY bits control the behavior of the ADC during Idle and Standby Sleep modes, in cases where the ADC is enabled (CTRLA.ENABLE = 1), refer to the following table.
| CTRLA.ENABLE | CTRLA.RUNSTDBY | CTRLA.ONDEMAND | Description |
|---|---|---|---|
| 0 | x | x | Disabled. |
| 1 | 0 | 0 | Run in all sleep modes except Standby. |
| 1 | 0 | 1 | Run in all sleep modes on request except Standby. |
| 1 | 1 | 0 | Run in all sleep modes. |
| 1 | 1 | 1 | Run in all sleep modes on request. |
Note:
- With On Demand Control, when CTRLA.ONDEMAND = 1, the analog block is always powered-off. When a start request is detected, the system returns from sleep and starts a new conversion.
- With Run in Idle or Seep mode, RUNSTDBY is enabled and the GCLK to the ADC continues to run when ONDEMAND = 0.
- With Run in Idle or Sleep mode and both ONDEMAND and RUNSTDBY set, the GCLK will be activated when requested. Therefore, there will be an additional delay until the analog front end is ready. Flag CTLINTFLAG.CRRDY = 1 will indicate when the corresponding ADC is ready.