Low-power universal asynchronous receiver transmitter (LPUART) RM0453
1226/1450 RM0453 Rev 5
Figure 345. Wake-up event verified (wake-up event = address match,
FIFO disabled)
Figure 346 shows the behavior when the wake-up event is not verified.
Figure 346. Wake-up event not verified (wake-up event = address match,
FIFO disabled)
Note: The above figures are valid when address match or any received frame is used as wake-up
event. In the case the wake-up event is the start bit detection, the LPUART sends the wake-
up event to the MCU at the end of the start bit.
MSv40860V2
lpuart_ker_ck
RX line
Idle
Start bit
Rx data 1 Rx data 2
Start bit
Stop bit
Stop bit
Startup time
OFF
ON
Low-power mode Run mode
Address match event WUF =’1'
LPUART sends a wakeup event to the MCU
Data reception goes on
MSv40861V2
lpuart_ker_ck
RX line
Idle
Start bit
Rx data 1
Stop bit
Startup time
OFF
ON
Low-power mode
Address does not match
Idle
OFF
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