In System ON mode, when the CPU and all peripherals are in IDLE state, the system can reside in one of two power submodes.
The power submodes are:
- Constant latency
- Low-power
In Constant latency mode, the CPU wakeup latency and the PPI task response will be constant and kept at a minimum. This is secured by a set of resources that are always enabled. Compared to Low-power mode, the advantage of having a constant and predictable latency comes at a cost of increased power consumption. Constant latency mode is selected by triggering the CONSTLAT task.
In Low-power mode, the most power efficient supply option is chosen by the automatic power management system. Achieving the lowest power possible is at the expense of variations in CPU wakeup latency and PPI task response. Low-power mode is selected by triggering the LOWPWR task.
When the system enters System ON, it is by default in the Low-power submode.