30.4.2.2 Clock Generation

In SPI host operation, the serial clock (SCK) is generated internally by the SERCOM baud rate generator. The 8-bit Baud register (BAUD) value is used for generating SCK and to clock the shift register. Refer to Clock Generation – Baud-Rate Generator for more details.

In SPI client operation, the clock is provided by an external host on the SCK pin. This clock is used to clock the SPI shift register directly.