Low-power universal asynchronous receiver transmitter (LPUART) RM0440
1708/2126 RM0440 Rev 4
CTS interrupt CTSIF CTSIE
CTSIF cleared by software by
setting CTSCF bit.
YES NO
Transmission Complete TC TCIE
TC cleared when a data is
written in TDR or by setting
TCCF bit.
YES NO
Receive data register not
empty (data ready to be
read)
RXNE RXNEIE
RXNE cleared by reading RDR
or by setting RXFRQ bit.
YES YES
Receive FIFO Not Empty RXFNE RXFNEIE
RXFNE cleared when the
RXFIFO is empty or by setting
RXFRQ bit.
YES YES
Receive FIFO Full RXFF
(1)
RXFFIE
RXFF cleared when the
RXFIFO contains at least one
data.
YES YES
Receive FIFO threshold
reached
RXFT RXFTIE
RXFT is cleared by hardware
when the RXFIFO content is
less than the programmed
threshold
YES YES
Overrun error detected ORE
RX-
NEIE/RX
FNEIE
ORE cleared by setting
ORECF bit.
YES NO
Idle line detected IDLE IDLEIE
IDLE cleared by setting
IDLECF bit.
YES NO
Parity error PE PEIE PE cleared by setting PECF bit. YES NO
Noise Flag, Overrun error
and Framing Error in
multibuffer communication.
NE or
ORE or
FE
EIE
NE cleared by setting NECF
bit.
ORE cleared by setting
ORECF bit.
FE flag cleared by setting
FECF bit.
YES NO
Character match CMF CMIE
CMF cleared by setting CMCF
bit.
YES NO
Wakeup from low-power
mode
WUF WUFIE
WUF is cleared by setting
WUCF bit.
YES YES
Transmit FIFO threshold
reached
TXFT TXFTIE
TXFT is cleared by hardware
when the TXFIFO content is
less than the programmed
threshold
YES YES
Receive FIFO threshold
reached
RXFT RXFTIE
RXFT is cleared by hardware
when the RXFIFO content is
less than the programmed
threshold.
YES YES
1. RXFF flag is asserted if the LPUART receives n+1 data (n being the RXFIFO size): n data in the RXFIFO and 1 data in
LPUART_RDR. In Stop mode, LPUART_RDR is not clocked. As a result, this register is not written, and once n data are
received and written in the RXFIFO, the RXFF interrupt is asserted (RXFF flag is not set).
Table 355. LPUART interrupt requests (continued)
Interrupt event
Event
flag
Enable
Control
bit
Interrupt clear method
Interrupt activated
lpuart_it lpuart_wkup
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