In System ON mode, the system can reside in one of the two sub-power modes when the CPU and all peripherals are in an IDLE state.
The sub-power modes are the following:
- Constant Latency
- Low-power
In Constant Latency mode, the CPU wakeup latency and the PPI task response are constant and kept at a minimum. This is secured by forcing a set of basic resources to be turned on while in sleep mode. Constant and predictable latency increases power consumption. Constant Latency mode is selected by triggering the task CONSTLAT.
In Low-power mode, the automatic power management system described in System ON mode ensures that the most efficient supply option is chosen to save power. The lowest possible power consumption comes at a cost of a varying CPU wakeup latency and PPI task response. Low-power mode is selected by triggering the task LOWPWR.
When the system enters System ON mode, it is in the sub-power mode Low-power by default.