at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 453

• Manufacturer Part Number: at91sam9260-cj
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 32-28. Normal Mode Configuration
32.6.8.2
Figure 32-29. Automatic Echo Mode Configuration
32.6.8.3
Figure 32-30. Local Loopback Mode Configuration
32.6.8.4
6221G–ATARM–31-Jan-08
Automatic Echo Mode
Local Loopback Mode
Remote Loopback 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
the TXD pin. The RXD pin is still connected to the receiver input, thus the receiver remains
active.
Local loopback mode connects the output of the transmitter directly to the input of the receiver,
as shown in
the receiver and the TXD pin is continuously driven high, as in idle state.
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
Transmitter
Transmitter
Transmitter
Receiver
Receiver
Receiver
32-30. The TXD and RXD pins are not used. The RXD pin has no effect on
Figure
1
32-29. Programming the transmitter has no effect on
RXD
TXD
RXD
TXD
RXD
TXD
AT91SAM9260
Figure
32-31.
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