AM3892 datasheet(283/299 Pages) TI

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AM3894

AM3892

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SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

8.20 Universal Asynchronous Receiver/Transmitter (UART)

The UART performs serial-to-parallel conversions on data received from a peripheral device and

parallel-to-serial conversion on data received from the CPU. The device provides up to three UART

peripheral interfaces, depending on the selected pin multiplexing.

Each UART has the following features:

•

Selectable UART/IrDA (SIR/MIR)/CIR modes

•

Dual 64-entry FIFOs for received and transmitted data payload

•

Programmable and selectable transmit and receive FIFO trigger levels for DMA and interrupt

generation

•

Baud-rate generation based upon programmable divisors N (N=1…16384)

•

Two DMA requests and one interrupt request to the system

•

Can connect to any RS-232 compliant device.

UART functions include:

•

Baud-rate up to 3.6 Mbit/s

•

Programmable serial interfaces characteristics

–

5, 6, 7, or 8-bit characters

–

Even, odd, or no parity-bit generation and detection

–

1, 1.5, or 2 stop-bit generation

–

Flow control: hardware (RTS/CTS) or software (XON/XOFF)

•

Additional modem control functions (UART0_DTR, UART0_DSR, UART0_DCD, and UART0_RIN) for

UART0 only; UART1 and UART2 do not support full-flow control signaling.

IR-IrDA functions include:

•

Support of IrDA 1.4 slow infrared (SIR, baud-rate up to 115.2 Kbits/s), medium infrared (MIR,

baud-rate up to 1.152 Mbits/s) and fast infrared (FIR baud-rate up to 4.0 Mbits/s) communications

•

Supports framing error, cyclic redundancy check (CRC) error, illegal symbol (FIR), and abort pattern

(SIR, MIR) detection

•

8-entry status FIFO (with selectable trigger levels) available to monitor frame length and frame errors.

IR-CIR functions include:

•

Consumer infrared (CIR) remote control mode with programmable data encoding

•

Free data format (supports any remote control private standards)

•

Selectable bit rate and configurable carrier frequency.

For more detailed information on the UART peripheral, see the UART chapter in the AM38x Sitara ARM

Microprocessors (MPUs) Technical Reference Manual (literature number SPRUGX7).

Peripheral Information and Timings

283

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