Figure 331. Wakeup Event Verified; Fifo Disabled); Figure 332. Wakeup Event Not Verified - STMicroelectronics STM32WLEx Reference Manual

RM0461
lpuart_ker_ck
Figure 332
Figure 332. 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 331. 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
RM0461 Rev 5
Data reception goes on
Rx data 2
Run mode
Idle
OFF
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