17.1 Overview
Depending on the application, peripherals may require specific clock frequencies to operate correctly. The Generic Clock controller (GCLK) features up to 8 Generic Clock Generators that can provide a wide range of clock frequencies.
Generators can be set to use different external and
internal oscillators as source. The clock of each Generator can be divided. The outputs
from the Generators are used as sources for the Peripheral Channels, which provide the
Generic Clock (GCLK_PERIPH) to the peripheral modules, as shown in Block
Diagram. The number of
Peripheral Clocks depends on how many peripherals the device has.
Note: The Generator 0 is always the direct
source of the GCLK_MAIN signal.