Low-power universal asynchronous receiver transmitter (LPUART) RM0440
1706/2126 RM0440 Rev 4
Figure 569. Wakeup event verified (wakeup event = address match,
FIFO disabled)
Figure 570 shows the behavior when the wakeup event is not verified.
Figure 570. Wakeup event not verified (wakeup event = address match,
FIFO disabled)
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.
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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