74.10.3.1.1 Idle Mode Operation
In Idle mode, the device power consumption is optimized versus response time. In this mode, only the processor clock is stopped. The peripheral clocks, including the DDR controller clock, can be enabled. The current consumption in this mode is application-dependent.
This mode is entered via the WFI instruction and CPU_CLK disabling.
The processor can be awakened from an interrupt. The system resumes where it was before entering WFI mode.