Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
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
as shown in
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
mentable by connecting the RTS and CTS pins with the remote device, as shown in
.
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
TXD
RXD
RTS
RTS
CTS