20.1 Overview
Depending on the application, peripherals may require specific clock frequencies to operate correctly. The Generic Clock controller (GCLK) features 16 Generic Clock Generators [15:0] that can provide a wide range of clock frequencies.
Generators can be set to use different external or
internal oscillators as source. The clock of each Generator can be divided according to
the user’s requirements. The outputs from the Generators are used as sources for the 64
Peripheral Channels, which provide the Generic Clock (GCLK_PERIPH) to the peripheral
modules, as shown in Figure 20-2. The number of Peripheral Clocks,
GCLK_PERIPH, depends on how many peripherals the device has.
Note: The Generator 0
is always the direct source of the GCLK_MAIN signal.