11.2 Overview

Sleep modes are used to shut down peripherals and clock domains in the device in order to save power. The Sleep Controller (SLPCTRL) controls and handles the transitions between active mode and sleep mode.

There are in total four modes available, one active mode in which software is executed, and three sleep modes. The available sleep modes are: Idle, Standby and Power Down.

When the device enters a sleep mode, program execution is stopped, and depending on the entered sleep mode, different peripherals and clock domains are turned off.

To enter a sleep mode, the SLPCTRL must be enabled and the desired sleep mode must be stated. The software decides when to enter that sleep mode by using a dedicated sleep instruction (SLEEP).

Interrupts are used to wake up the device from sleep. The available Interrupt wake-up sources depend on the configured sleep mode. When an interrupt occurs, the device will wake up and execute the interrupt service routine before continuing normal program execution from the first instruction after the sleep instruction. Any Reset will also take the device out of a sleep mode.