STM32L432KB Datasheet, PDF (39/149 Pages) STMicroelectronics – Batch acquisition mode

STM32L432KB STM3L432KC
Functional overview
3.24
Universal synchronous/asynchronous receiver transmitter
(USART)
The STM32L432xx devices have two embedded universal synchronous receiver
transmitters (USART1 and USART2).
These interfaces provide asynchronous communication, IrDA SIR ENDEC support,
multiprocessor communication mode, single-wire half-duplex communication mode and
have LIN Master/Slave capability. They provide hardware management of the CTS and RTS
signals, and RS485 Driver Enable. They are able to communicate at speeds of up to
10Mbit/s.
USART1 and USART2 also provide Smart Card mode (ISO 7816 compliant) and SPI-like
communication capability.
All USART have a clock domain independent from the CPU clock, allowing the USARTx
(x=1,2) to wake up the MCU from Stop mode using baudrates up to 200 Kbaud. The wake
up events from Stop mode are programmable and can be:
• Start bit detection
• Any received data frame
• A specific programmed data frame
All USART interfaces can be served by the DMA controller.
Table 10. STM32L432xx USART/LPUART features
USART modes/features⁽¹⁾
USART1 USART2
LPUART1
Hardware flow control for modem
Continuous communication using DMA
Multiprocessor communication
X
X
X
X
X
X
X
X
X
Synchronous mode
Smartcard mode
Single-wire half-duplex communication
IrDA SIR ENDEC block
LIN mode
Dual clock domain
Wakeup from Stop 0 / Stop 1 modes
Wakeup from Stop 2 mode
Receiver timeout interrupt
X
X
-
X
X
-
X
X
X
X
X
-
X
X
-
X
X
X
X
X
X
-
-
X
X
X
-
Modbus communication
Auto baud rate detection
Driver Enable
LPUART/USART data length
X
X
-
X (4 modes)
-
X
X
X
7, 8 and 9 bits
1. X = supported.
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