Datasheet
520
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
Figure 31-56. Automatic Echo Mode Configuration
31.7.9.3 Local Loopback Mode
Local loopback mode connects the output of the transmitter directly to the input of the receiver, as shown in Figure
31-57. The TXD and RXD pins are not used. The RXD pin has no effect on the receiver and the TXD pin is contin-
uously driven high, as in idle state.
Figure 31-57. Local Loopback Mode Configuration
31.7.9.4 Remote Loopback Mode
Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in Figure 31-58. The transmitter
and the receiver are disabled and have no effect. This mode allows bit-by-bit retransmission.
Figure 31-58. Remote Loopback Mode Configuration
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
1
Receiver
Transmitter
RXD
TXD
1