ST STM32WL55JC Reference Manual page 1205

RM0453
36 Low-power universal asynchronous receiver
transmitter (LPUART)
This section describes the low-power universal asynchronous receiver transmitted
(LPUART).
36.1 LPUART introduction
The LPUART is an UART which enables bidirectional UART communications with a limited
power consumption. Only 32.768 kHz LSE clock is required to enable UART
communications up to 9600 baud. Higher baud rates can be reached when the LPUART is
clocked by clock sources different from the LSE clock.
Even when the device is in low-power mode, the LPUART can wait for an incoming UART
frame while having an extremely low energy consumption. The LPUART includes all
necessary hardware support to make asynchronous serial communications possible with
minimum power consumption.
It supports Half-duplex Single-wire communications and modem operations (CTS/RTS).
It also supports multiprocessor communications.
DMA (direct memory access) can be used for data transmission/reception.
Low-power universal asynchronous receiver transmitter (LPUART)
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