Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet
Product codes
ATSAM4L-XPRO
575
42023E–SAM–07/2013
ATSAM4L8/L4/L2
frame lengths with the time-out feature. The USART supports several operating modes, provid-
ing an interface to RS485, LIN, and SPI buses, with ISO7816 T=0 and T=1 smart card slots, and
infrared transceivers, and modem port connections. Communication with slow and remote
devices is eased by the timeguard. Duplex multidrop communication is supported by address
and data differentiation through the parity bit. The hardware handshaking feature enables an
out-of-band flow control, automatically managing RTS and CTS pins. The Peripheral DMA Con-
troller connection enables memory transactions, and the USART supports chained buffer
management without processor intervention. Automatic echo, remote-, and local loopback test
modes are also supported.
ing an interface to RS485, LIN, and SPI buses, with ISO7816 T=0 and T=1 smart card slots, and
infrared transceivers, and modem port connections. Communication with slow and remote
devices is eased by the timeguard. Duplex multidrop communication is supported by address
and data differentiation through the parity bit. The hardware handshaking feature enables an
out-of-band flow control, automatically managing RTS and CTS pins. The Peripheral DMA Con-
troller connection enables memory transactions, and the USART supports chained buffer
management without processor intervention. Automatic echo, remote-, and local loopback test
modes are also supported.
24.3
Block Diagram
Figure 24-1. USART Block Diagram
Peripheral DMA
Controller
Channel
Channel
Interrupt
Controller
Power
Manager
DIV
Receiver
Transmitter
Modem
Signals
Signals
Control
User
Interface
I/O
Controller
RXD
RTS
TXD
CTS
DTR
DSR
DCD
RI
CLK
BaudRate
Generator
Generator
USART
Interrupt
CLK_USART
CLK_USART/DIV
USART
Peripheral bus