Datasheet

31. Power Management Controller (PMC)

31.1 Description

The Power Management Controller (PMC) optimizes power consumption by controlling all system and user

peripheral clocks. The PMC enables/disables the clock inputs to many of the peripherals and the

Cortex-M7

processor.

The Supply Controller selects either the Slow RC oscillator or the 32.768 kHz crystal oscillator as the source of

SLCK. The unused oscillator is disabled automatically so that power consumption is optimized.

By default, at startup, the chip runs out of MCK using the Main RC oscillator running at 12 MHz.

31.2 Embedded Characteristics

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

SAM E70/S70/V70/V71 Family

Power Management Controller (PMC)

echnology Inc.

Datasheet

DS60001527D-page 250