33.2 Embedded Characteristics

The Power Management Controller provides the following clocks:

• Main System Bus Clock (MCK)—programmable from a few hundred Hz to the maximum operating frequency of the device. It is available to the modules running permanently.
• Processor Clock (PCK)—must be switched off when processor is entering Idle mode
• HS USB Device Clock (UDPCK)
• H64MX Matrix Clock (MCK) and H32MX Matrix Clock (MCK or MCK/2)
• Peripheral Clocks—provided to the embedded peripherals and independently controllable
• Programmable Clock Outputs—can be selected from the clocks provided by the Clock Generator and driven on the PCKx pins
• Generic Clock (GCLK)—for peripherals that can accept a second clock source
• Asynchronous Partial Wake-up—for FLEXCOMx, SPIx, TWIx, UARTx and ADC