Equip a "clock switch" for a single peripheral / functional block: Every device in the chip (such as ADC, UART) operates relying on a "clock signal"(equivalent to a "heartbeat"). This function is to install an individual "switch" for each device: when a certain device is not in use, turn off its "heartbeat", and the device will consume no power; turn on the switch again when it is needed.

Automatic clock gating based on processor sleep state: For example, when the processor "goes to sleep (enters sleep state)", the system will automatically turn off the "heartbeat" signals of all unused devices, eliminating the need for you to manually disable them one by one, which is both convenient and power-efficient.

Switch the "speed/source" of the system clock at any time: The "operating rhythm (clock frequency)" of the chip can be adjusted at any time: for example, use a "fast rhythm"(high frequency) to work normally, and switch to a "slow rhythm"(low frequency) when power saving is needed; you can even switch to a more power-saving "clock source"(for example, switch from an external crystal oscillator to the internal oscillator of the chip, which is equivalent to using a "built-in battery" instead of an "external power supply"), and turn off unused clock components at the same time to further save power.

Deep Sleep (DORMANT): It features near-zero dynamic power consumption while remaining wakeable. This is a "deep standby" state where dynamic power consumption is practically zero — analogous to a phone being powered off yet still able to be woken by an alarm. The chip will idle to the point of performing almost no operations, yet it can be instantly awakened to resume work as soon as an external signal is detected on a GPIO pin (such as a button press) or the real-time clock reaches a preset trigger time.