Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
790
Figure 36-40. Normal Mode Configuration
36.7.9.2 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
. 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 36-41. Automatic Echo Mode Configuration
36.7.9.3 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 36-42. Local Loopback Mode Configuration
36.7.9.4 Remote Loopback Mode
Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in
. The transmitter
and the receiver are disabled and have no effect. This mode allows bit-by-bit retransmission.
Figure 36-43. Remote Loopback Mode Configuration
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
Receiver
Transmitter
RXD
TXD
1
Receiver
Transmitter
RXD
TXD
1