25.6.2.1 Initialization

The SERCOM must be configured to the desired mode by writing the Operating Mode bits in the Control A register (CTRLA.MODE) as shown in the table below.

Table 25-1. SERCOM Modes
CTRLA.MODEDescription
0x0USART with external clock
0x1USART with internal clock
0x2SPI in client operation
0x3SPI in host operation
0x4I2C client operation
0x5I2C host operation
0x6-0x7Reserved

For further initialization information, see the respective SERCOM mode chapters: