5.3.1 SAM D21 Curiosity Nano Evaluation Kit

Two SAM D21 Curiosity Nano Evaluation Kit are connected to each other by SERCOM USART lines (TxD and RxD), and connected to the PC terminal through EDBG port.

Note: Click here to access the source code for this application configuration. Alternatively, it is also available in the GitHub reference_apps repository.

Figure 5-36. Block Diagram (SAM D21 Curiosity Nano Evaluation Kit)

The fractional baud equation must be used to calculate the baud value:

fbaud = fref /S(BAUD+(FP/8))

Where,


	fbaud – fractional baud frequency
	fref – SERCOM generic clock frequency
	S – Number of samples per bit
	BAUD – BAUD value
	FP – fractional part of baud value

From the Fractional baud equation,


BAUD + FP/8	= fref / (fbaud x S)
	= 8000000 / (11000 x 16)
	= 45.454

Here the integer part corresponds to the BAUD value and the decimal part corresponds to the fractional part.

BAUD = 45,

FP/8 = .454

FP = 3.6, which is 3