13.8.6.1.3 Sleep Modes

The device can be set in a sleep mode. In sleep mode, the CPU is stopped and the peripherals are either active or idle, according to the sleep mode depth:

• Idle sleep mode: The CPU is stopped. Synchronous clocks are stopped except when requested. The logic is retained.
• Standby sleep mode: The CPU is stopped as well as the peripherals. The logic is retained, and power domain gating can be used to reduce power consumption further.
• Backup sleep mode: Only the backup domain is kept powered to allow few features to run (RTC, 32KHz clock sources, and wake-up from external pins).