SAM4L Datasheet, PDF (612/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
Figure 24-55. Automatic Echo Mode Configuration
Receiver
RXD
Transmitter
TXD
24.6.17.3
Local Loopback Mode
Local loopback mode connects the output of the transmitter directly to the input of the receiver,
as shown in Figure 24-56. 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 24-56. Local Loopback Mode Configuration
Receiver
RXD
Transmitter
TXD
1
24.6.17.4
Remote Loopback Mode
Remote loopback mode connects the RXD pin to the TXD pin, as shown in Figure 24-57. The
transmitter and the receiver are disabled and have no effect. This mode allows bit-by-bit
retransmission.
Figure 24-57. Remote Loopback Mode Configuration
Receiver
1
RXD
Transmitter
TXD
24.6.18 Interrupts
23
–
15
LINTC
22
–
14
LINID
21
–
13
NACK/LINBK
20
MANE
12
RXBUFF
19
CTSIC
11
–
18
DCDIC
10
ITER/UNRE
17
DSRIC
9
TXEMPTY
MANEA
16
RIIC
8
TIMEOUT
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