12.3.4.1.2 Internal 32.768 kHz Oscillator (OSC32K)

The 32.768 kHz oscillator is optimized for Ultra-Low Power (ULP) operation. Power consumption is decreased at the cost of decreased accuracy compared to an external crystal oscillator.

This oscillator provides a 32.768 kHz clock to the Main Clock (CLK_MAIN). It also provides a 1.024 kHz and/or 32.768 kHz clock for several peripherals. See the CLKCTRL Block Diagram for details.

For the start-up time of this oscillator, refer to the Electrical Characteristics chapter.