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1745D–ATARM–04-Nov-05
AT91M55800A
• NBSTOP: Number of Stop Bits
The interpretation of the number of stop bits depends on SYNC.
• CHMODE: Channel Mode
• MODE9: 9-Bit Character Length (Code Label US_MODE9)
0 = CHRL defines character length.
1 = 9-Bit character length.
• CKLO: Clock Output Select (Code Label US_CLKO)
0 = The USART does not drive the SCK pin.
1 = The USART drives the SCK pin if USCLKS[1] is 0.
NBSTOP Asynchronous (SYNC = 0) Synchronous (SYNC = 1) Code Label: US_NBSTOP
0 0 1 stop bit 1 stop bit US_NBSTOP_1
0 1 1.5 stop bits Reserved US_NBSTOP_1_5
1 0 2 stop bits 2 stop bits US_NBSTOP_2
1 1 Reserved Reserved –
CHMODE Mode Description
Code Label: US_CHMODE
0 0
Normal Mode
The USART Channel operates as an Rx/Tx USART.
US_CHMODE_NORMAL
0 1
Automatic Echo
Receiver Data Input is connected to TXD pin.
US_CHMODE_AUTOMATIC_ECHO
1 0
Local Loopback
Transmitter Output Signal is connected to Receiver Input Signal.
US_CHMODE_LOCAL_LOOPBACK
1 1
Remote Loopback
RXD pin is internally connected to TXD pin.
US_CHMODE_REMODE_LOOPBACK