The Power Management Controller provides the following clocks:
- Master Clock (MCK), programmable from a few hundred Hz to the maximum operating frequency of the device. It is available to the modules running permanently, such as the Enhanced Embedded Flash Controller
- Processor Clock (HCLK), automatically switched off when entering the processor in Sleep mode
- Free-running processor Clock (FCLK)
- The Cortex-M7 SysTick external clock
- USB Clock (USB_48M), required by the USB peripheral
- Peripheral Clocks with independent ON/OFF control, provided to the peripherals
- Programmable Clock Outputs (PCKx), selected from the clock generator outputs to drive the device PCK pins
- Clock sources independent of MCK and HCLK, provided by internal PCKx for USART, UART, TC, Embedded Trace Macrocell (ETM) and CAN Clocks
- Generic Clock (GCLK) with controllable division and ON/OFF control, independent of MCK and HCLK. Provided to selected peripherals.
The Power Management Controller also provides the following features on clocks:
- A Main crystal oscillator failure detector
- A 32.768 kHz crystal oscillator frequency monitor
- A frequency counter on Main crystal oscillator or Main RC oscillator
- An on-the-fly adjustable Main RC oscillator frequency