Figure 568. Wakeup Event Verified; Fifo Disabled); Figure 569. Wakeup Event Not Verified - ST STM32G4 Series Reference Manual

RM0440
lpuart_ker_ck
Figure 569
Figure 569. Wakeup event not verified (wakeup event = address match,
lpuart_ker_ck
Note: The above figures are valid when address match or any received frame is used as wakeup
event. In the case the wakeup event is the start bit detection, the LPUART sends the
wakeup event to the MCU at the end of the start bit.
Low-power universal asynchronous receiver transmitter (LPUART)
Figure 568. Wakeup event verified (wakeup event = address match,
Idle
RX line
Startup time
OFF
Low-power mode
shows the behavior when the wakeup event is not verified.
Idle
RX line
Startup time
OFF

FIFO disabled)

Address match event WUF ='1'
LPUART sends a wakeup event to the MCU
Rx data 1
ON
FIFO disabled)
Address does not match
Rx data 1
ON
Low-power mode
RM0440 Rev 1
Data reception goes on
Rx data 2
Run mode
Idle
OFF
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