AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 265

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Universal Synchronous/Asynchronous Receiver/Transmitter (USART)
Overview
6071A–ATARM–28-Oct-04
The Universal Synchronous Asynchronous Receiver Transceiver (USART) provides one full
duplex universal synchronous asynchronous serial link. Data frame format is widely program-
mable (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 commu-
nications with slow remote devices. Multi-drop communications are also supported through
address bit handling 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 buses, with
ISO7816 T = 0 or T = 1 smart card slots, infrared transceivers and connection to modem ports.
The hardware handshaking feature enables an out-of-band flow control by automatic manage-
ment of the pins RTS and CTS.
The USART supports the connection to the Peripheral Data Controller, which enables data
transfers to the transmitter and from the receiver. The PDC provides chained buffer manage-
ment without any intervention of the processor.
AT91SAM7S32 Preliminary
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