STM32F769AI datasheet(42/255 Pages) STMICROELECTRONICS

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Functional overview

STM32F765xx STM32F767xx STM32F768Ax STM32F769xx

42/255

DocID029041 Rev 4

2.25

Universal synchronous/asynchronous receiver transmitters

(USART)

The devices embed USART. Refer to Table 8: USART implementation for the features

implementation.

The universal synchronous asynchronous receiver transmitter (USART) offers a flexible

means of full-duplex data exchange with external equipment requiring an industry standard

NRZ asynchronous serial data format.

The USART peripheral supports:

•

Full-duplex asynchronous communications

•

Configurable oversampling method by 16 or 8 to give flexibility between speed and

clock tolerance

•

Dual clock domain allowing convenient baud rate programming independent from the

PCLK reprogramming

•

A common programmable transmit and receive baud rate of up to 27 Mbit/s when the

USART clock source is system clock frequency (max is 216 MHz) and oversampling by

8 is used.

•

Auto baud rate detection

•

Programmable data word length (7 or 8 or 9 bits) word length

•

Programmable data order with MSB-first or LSB-first shifting

•

Progarmmable parity (odd, even, no parity)

•

Configurable stop bits (1 or 1.5 or 2 stop bits)

•

Synchronous mode and clock output for synchronous communications

•

Single-wire half-duplex communications

•

Separate signal polarity control for transmission and reception

•

Swappable Tx/Rx pin configuration

•

Hardware flow control for modem and RS-485 transceiver

•

Multiprocessor communications

•

LIN master synchronous break send capability and LIN slave break detection capability

•

IrDA SIR encoder decoder supporting 3/16 bit duration for normal mode

•

Smartcard mode ( T=0 and T=1 asynchronous protocols for Smartcards as defined in

the ISO/IEC 7816-3 standard )

•

Support for Modbus communication

Table 8 summarizes the implementation of all U(S)ARTs instances

Table 8. USART implementation

features(1)

USART1/2/3/6

UART4/5/7/8

Data Length

7, 8 and 9 bits

Hardware flow control for modem

Continuous communication using DMA

Multiprocessor communication

Synchronous mode

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