AM652X datasheet(278/299 Pages) TI1

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278

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Detailed Description

6.11.25 UART

The UART is a slave peripheral that utilizes the DMA for data transfer or interrupt polling via host CPU.

There are five UART modules in the device. All UART modules support IrDA and CIR modes when 48

MHz function clock is used. Each UART can be used for configuration and data exchange with a number

of external peripheral devices or interprocessor communication between devices.

The UART include the following features:

•

16C750-compatible

•

RS-485 external transceiver auto flow control support

•

64-byte FIFO buffer for receiver and 64-byte FIFO for transmitter

•

Programmable interrupt trigger levels for FIFOs

•

Programmable sleep mode

•

The 48 MHz functional clock option allows baud rates up to 3.6Mbps

•

The 192 MHz functional clock option allows baud rates up to 12Mbps

•

Auto-baud between 1200 bits/s and 115.2 Kbits/s (only when 48 MHz function clock is used)

•

Optional multi-drop transmission

•

Configurable time-guard feature

•

Configurable data format:

–

Data bit: 5, 6, 7, or 8 bits

–

Parity bit: Even, odd, none

–

Stop-bit: 1, 1.5, 2 bit(s)

•

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

•

False start bit detection

•

Line break generation and detection

•

Fully prioritized interrupt system controls

•

Internal test and loopback capabilities

•

Modem control functions (CTS, RTS)

•

USART0 module in MAIN domain has extended modem control signals (DCD, RI, DTR, DSR)

The IrDA includes the following features:

•

Support of IrDA 1.4 slow infrared (SIR), medium infrared (MIR), and fast infrared (FIR)

communications:

–

Slow infrared (SIR 115.2 KBAUD), medium infrared (MIR 0.576 MBAUD) and fast infrared (FIR 4.0

MBAUD) operations (very fast infrared (VFIR) is not supported)

–

Frame formatting: Addition of variable beginning-of-frame (xBOF) characters and end-of-frame

(EOF) characters

–

Uplink/downlink cyclic redundancy check (CRC) generation/detection

–

Asynchronous transparency (automatic insertion of break character)

–

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

–

Framing error, CRC error, illegal symbol (FIR), and abort pattern (SIR, MIR) detection

•

IrDA mode when 48 MHz function clock is used

The CIR mode uses a variable pulse-width modulation (PWM) technique (based on multiples of a

programmable t period) to encompass the various formats of infrared encoding for remote-control

applications. The CIR logic transmits data packets based on a user-definable frame structure and packet

content.

The CIR includes the following features to provide CIR support for remote-control applications:

•

Transmit and receive mode

•

Free data format (supports any remote-control private standards)

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