RM0444 Rev 5 1113/1390
RM0444 Low-power universal asynchronous receiver transmitter (LPUART)
1138
34.6 LPUART interrupts
Refer to Table 195 for a detailed description of all LPUART interrupt requests.
Table 195. LPUART interrupt requests
Interrupt
vector
Interrupt event
Event
flag
Enable
Control
bit
Interrupt clear
method
Exit from
Sleep
mode
Exit from
Stop
(1)
modes
Exit from
Standby
mode
LPUART
Transmit data
register empty
TXE TXEIE Write TDR
YES
NO
NO
Transmit FIFO Not
Full
TXFNF TXFNFIE TXFIFO full NO
Transmit FIFO
Empty
TXFE TXFEIE
Write TDR or write 1
in TXFRQ
YES
Transmit FIFO
threshold reached
TXFT TXFTIE Write TDR YES
CTS interrupt CTSIF CTSIE Write 1 in CTSCF NO
Transmission
Complete
TC TCIE
Write TDR or write 1
in TCCF
NO
Receive data
register not empty
(data ready to be
read)
RXNE RXNEIE
Read RDR or write
1 in RXFRQ
YES
YES
Receive FIFO Not
Empty
RXFNE RXFNEIE
Read RDR until
RXFIFO empty or
write 1 in RXFRQ
YES
Receive FIFO Full RXFF
(2)
RXFFIE Read RDR YES
Receive FIFO
threshold reached
RXFT RXFTIE Read RDR YES
Overrun error
detected
ORE
RX-
NEIE/RX
FNEIE
Write 1 in ORECF NO
Idle line detected IDLE IDLEIE Write 1 in IDLECF NO
Parity error PE PEIE Write 1 in PECF NO
Noise error in
multibuffer
communication.
NE
EIE
Write 1 in NFCF NO
Overrun error in
multibuffer
communication.
ORE
(3)
Write 1 in ORECF NO
Framing Error in
multibuffer
communication.
FE Write 1 in FECF NO
Character match CMF CMIE Write 1 in CMCF NO
Wakeup from low-
power mode
WUF WUFIE Write 1 in WUC YES
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