Datasheet

589
32072H–AVR32–10/2012
AT32UC3A3
Figure 25-55. Automatic Echo Mode Configuration
25.6.17.3 Local Loopback Mode
Local loopback mode connects the output of the transmitter directly to the input of the receiver,
as shown in Figure 25-56. 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 25-56. Local Loopback Mode Configuration
25.6.17.4 Remote Loopback Mode
Remote loopback mode connects the RXD pin to the TXD pin, as shown in Figure 25-57. The
transmitter and the receiver are disabled and have no effect. This mode allows bit-by-bit
retransmission.
Figure 25-57. Remote Loopback Mode Configuration
25.6.18 Interrupts
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
1
Receiver
Transmitter
RXD
TXD
1
–– MANEA
23 22 21 20 19 18 17 16
– – – MANE CTSIC DCDIC DSRIC RIIC
15 14 13 12 11 10 9 8
LINTC LINIR NACK RXBUFF – ITER/UNRE TXEMPTY TIMEOUT