Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
919
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
Figure 38-40. Normal Mode Configuration
38.7.9.2 Automatic Echo Mode
Automatic echo mode allows bit-by-bit retransmission. When a bit is received on the RXD pin, it is sent to the TXD
pin, as shown in
pin, as shown in
. Programming the transmitter has no effect on the TXD pin. The RXD pin is still
connected to the receiver input, thus the receiver remains active.
Figure 38-41. Automatic Echo Mode Configuration
38.7.9.3 Local Loopback Mode
Local loopback mode connects the output of the transmitter directly to the input of the receiver, as shown in
. The TXD and RXD pins are not used. The RXD pin has no effect on the receiver and the TXD pin is
continuously driven high, as in idle state.
Figure 38-42. Local Loopback Mode Configuration
38.7.9.4 Remote Loopback Mode
. The transmitter
and the receiver are disabled and have no effect. This mode allows bit-by-bit retransmission.
Figure 38-43. Remote Loopback Mode Configuration
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
1
Receiver
Transmitter
RXD
TXD
1