Datasheet

This bit is not synchronized.

Value Description

Asynchronous communication.

Synchronous communication.

Bits 27:24 – FORM[3:0] Frame Format

These bits define the frame format.

These bits are not synchronized.

FORM[3:0] Description

0x0 USART frame

0x1 USART frame with parity

0x2-0x3 Reserved

0x4 Auto-baud - break detection and auto-baud.

0x5 Auto-baud - break detection and auto-baud with parity

0x6-0xF Reserved

Bits 23:22 – SAMPA[1:0] Sample Adjustment

These bits define the sample adjustment.

These bits are not synchronized.

SAMPA[1:0] 16x Over-sampling (CTRLA.SAMPR=0 or

8x Over-sampling (CTRLA.SAMPR=2 or

0x0 7-8-9 3-4-5

0x1 9-10-11 4-5-6

0x2 11-12-13 5-6-7

0x3 13-14-15 6-7-8

Bits 21:20 – RXPO[1:0] Receive Data Pinout

These bits define the receive data (RxD) pin configuration.

These bits are not synchronized.

RXPO[1:0] Name Description

0x0 PAD[0] SERCOM PAD[0] is used for data reception

0x1 PAD[1] SERCOM PAD[1] is used for data reception

0x2 PAD[2] SERCOM PAD[2] is used for data reception

0x3 PAD[3] SERCOM PAD[3] is used for data reception

Bits 17:16 – TXPO[1:0] Transmit Data Pinout

These bits define the transmit data (TxD) and XCK pin configurations.

SAM D21 Family

SERCOM USART

Datasheet Complete

DS40001882D-page 488