Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

800

0: CHRL defines character length.
1: 9-bit character length.

0: The USART does not drive the SCK pin.
1: The USART drives the SCK pin if USCLKS does not select the external clock SCK.

0: 16x Oversampling.
1: 8x Oversampling.

0: The NACK is generated.
1: The NACK is not generated.

0: NACK is sent on the ISO line as soon as a parity error occurs in the received character (unless INACK is set).
1: Successive parity errors are counted up to the value specified in the MAX_ITERATION field. These parity errors gener-

ate a NACK on the ISO line. As soon as this value is reached, no additional NACK is sent on the ISO line. The flag 

ITERATION is asserted.

0: The data field transmitted on TXD line is the same as the one written in US_THR register or the content read in US_RHR 

is the same as RXD line. Normal mode of operation.
1: The data field transmitted on TXD line is inverted (voltage polarity only) compared to the value written on US_THR reg-

ister or the content read in US_RHR is inverted compared to what is received on RXD line (or ISO7816 IO line). Inverted 

mode of operation, useful for contactless card application. To be used with configuration bit MSBF.

0: User defined configuration of command or data sync field depending on MODSYNC value.
1: The sync field is updated when a character is written into US_THR register.

0–7: Defines the maximum number of iterations in mode ISO7816, protocol T = 0.

0: The USART does not filter the receive line.
1: The USART filters the receive line using a three-sample filter (1/16-bit clock) (2 over 3 majority).

0: Manchester encoder/decoder are disabled.
1: Manchester encoder/decoder are enabled.

0:The Manchester start bit is a 0 to 1 transition