19.1 Overview

Depending on the application, peripherals may require specific clock frequencies to operate correctly. The Generic Clock controller (GCLK) features 12 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 48 Peripheral Channels, which provide the Generic Clock (GCLK_PERIPH) to the peripheral modules, as shown in Figure 19-2. 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.