Datasheet

589
42023E–SAM–07/2013
ATSAM4L8/L4/L2
Figure 24-16. 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 24-17.
Figure 24-17. Example of RTS Drive with Timeguard Enabled
24.6.6 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 24-
18.
Figure 24-18. 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