Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK データシート

 469

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The Universal Synchronous Asynchronous Receiver Transmitter (USART) provides one full duplex universal syn-
chronous asynchronous serial link. Data frame format is widely programmable (data length, parity, number of stop
bits) to support a maximum of standards. The receiver implements parity error, framing error and overrun error
detection. The receiver time-out enables handling variable-length frames and the transmitter timeguard facilitates
communications with slow remote devices. Multidrop communications are also supported through address bit han-
dling in reception and transmission.

The USART features three test modes: remote loopback, local loopback and automatic echo.

The USART supports specific operating modes providing interfaces on RS485, LIN and SPI buses, with ISO7816 T
= 0 or T = 1 smart card slots and infrared transceivers. The hardware handshaking feature enables an out-of-band
flow control by automatic management of the pins RTS and CTS.

The USART supports the connection to the Peripheral DMA Controller, which enables data transfers to the trans-
mitter and from the receiver. The PDC provides chained buffer management without any intervention of the
processor.

• Programmable Baud Rate Generator

• 5- to 9-bit full-duplex synchronous or asynchronous serial communications

– 1, 1.5 or 2 stop bits in Asynchronous Mode or 1 or 2 stop bits in Synchronous Mode

– Parity generation and error detection

– Framing error detection, overrun error detection

– MSB- or LSB-first

– Optional break generation and detection

– By 8 or by-16 over-sampling receiver frequency

– Hardware handshaking RTS-CTS

– Receiver time-out and transmitter timeguard

– Optional Multi-drop Mode with address generation and detection

– Optional Manchester Encoding

• RS485 with driver control signal

• ISO7816, T = 0 or T = 1 Protocols for interfacing with smart cards

– NACK handling, error counter with repetition and iteration limit

• IrDA modulation and demodulation

– Communication at up to 115.2 Kbps

• Test Modes

– Remote Loopback, Local Loopback, Automatic Echo