Datasheet

561
32072H–AVR32–10/2012
AT32UC3A3
Figure 25-15. Typical Connection to a RS485 Bus
If a timeguard has been configured the RTS pin will remain high for the duration specified in TG,
as shown in Figure 25-16.
Figure 25-16. Example of RTS Drive with Timeguard Enabled
25.6.6 Hardware Handshaking
The USART features an out-of-band hardware handshaking flow control mechanism, imple-
mentable by connecting the RTS and CTS pins with the remote device, as shown in Figure 25-
17.
Figure 25-17. Connection with a Remote Device for Hardware Handshaking
USART
RTS
TXD
RXD
Differential
Bus
D0 D1 D2 D3 D4 D5 D6 D7
TXD
Start
Bit
Parity
Bit
Stop
Bit
Baud Rate
Clock
TG = 4
Write
THR
TXRDY
TXEMPTY
RTS
USART
TXD
CTS
Remote
Device
RXD
TXDRXD
RTS
RTS
CTS