Usart Main Features - ST STM32WL5 Series Reference Manual

Universal synchronous/asynchronous receiver transmitter (USART/UART)
35.2

USART main features

• Full-duplex asynchronous communication
•
NRZ standard format (mark/space)
• Configurable oversampling method by 16 or 8 to achieve the best compromise
between speed and clock tolerance
•
Baud rate generator systems
•
Two internal FIFOs for transmit and receive data
Each FIFO can be enabled/disabled by software and come with a status flag.
•
A common programmable transmit and receive baud rate
•
Dual clock domain with dedicated kernel clock for peripherals independent from PCLK
•
Auto baud rate detection
•
Programmable data word length (7, 8 or 9 bits)
• Programmable data order with MSB-first or LSB-first shifting
•
Configurable stop bits (1 or 2 stop bits)
• Synchronous master/slave mode and clock output/input for synchronous
communications
•
SPI slave transmission underrun error flag
•
Single-wire Half-duplex communications
•
Continuous communications using DMA
•
Received/transmitted bytes are buffered in reserved SRAM using centralized DMA.
•
Separate enable bits for transmitter and receiver
•
Separate signal polarity control for transmission and reception
•
Swappable Tx/Rx pin configuration
•
Hardware flow control for modem and RS-485 transceiver
•
Communication control/error detection flags
•
Parity control:
–
–
•
Interrupt sources with flags
•
Multiprocessor communications: wakeup from Mute mode by idle line detection or
address mark detection
•
Wakeup from Stop mode
1128/1461
Transmits parity bit
Checks parity of received data byte
RM0453 Rev 1
RM0453