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6174B–ATARM–07-Nov-05
AT91FR40162S Preliminary
17.9
Channel Modes
The USART can be programmed to operate in three different test modes, using the field
CHMODE in US_MR.
Automatic Echo Mode allows bit by bit re-transmission. When a bit is received on the RXD line, it
is sent to the TXD line. Programming the transmitter has no effect.
Local Loopback Mode allows the transmitted characters to be received. TXD and RXD pins are
not used and the output of the transmitter is internally connected to the input of the receiver. The
RXD pin level has no effect and the TXD pin is held high, as in idle state.
Remote Loopback Mode directly connects the RXD pin to the TXD pin. The Transmitter and the
Receiver are disabled and have no effect. This mode allows bit by bit re-transmission.
Figure 17-7. Channel Modes
Receiver
Transmitter
Disabled
RXD
TXD
Receiver
Transmitter
Disabled
RXD
TXD
V
DD
Disabled
Receiver
Transmitter
Disabled
RXD
TXD
Disabled
Automatic Echo
Local Loopback
Remote Loopback
V
DD
Содержание AT91FR40162S
Страница 180: ...180 6174B ATARM 07 Nov 05 AT91FR40162S Preliminary Figure 19 2 MCKO Relative to NRST NRST tD MCKO...
Страница 195: ...195 6174B ATARM 07 Nov 05 AT91FR40162S Preliminary 20 5 2 CE Controlled Figure 20 15 CE Controlled...
Страница 204: ...204 6174B ATARM 07 Nov 05 AT91FR40162S Preliminary 23 AT91FR40162S Errata There is no known errata for the AT91FR40162S...