at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 376

• Manufacturer Part Number: at91cap7e
• Description: Customizable Microcontroller
• Manufacturer: ATMEL Corporation

Figure 29-38. Normal Mode Configuration
29.6.8.2
Figure 29-39. Automatic Echo Mode Configuration
29.6.8.3
Figure 29-40. Local Loopback Mode Configuration
29.6.8.4
376
AT91CAP7E
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
29-40. The TXD and RXD pins are not used. The RXD pin has no effect on
Figure
1
29-39. Programming the transmitter has no effect on
RXD
TXD
RXD
TXD
RXD
TXD
8549A–CAP–10/08
Figure
29-41.