ST STM32G4 Series Reference Manual page 1640

Low-power universal asynchronous receiver transmitter (LPUART)
37 Low-power universal asynchronous receiver
transmitter (LPUART)
This section describes the low-power universal asynchronous receiver transmitted
(LPUART).
37.1 LPUART introduction
The LPUART is an UART which allows bidirectional UART communications with a limited
power consumption. Only 32.768 kHz LSE clock is required to allow UART communications
up to 9600 baud/s. Higher baud rates can be reached when the LPUART is clocked by clock
sources different from the LSE clock.
Even when the microcontroller 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.
1640/2083 RM0440 Rev 1
RM0440