Usart Interrupts; Table 172. Usart Interrupt Requests - ST STM32F423 Reference Manual

RM0430 Universal synchronous receiver transmitter (USART) /universal asynchronous receiver
Note: Special behavior of break frames: when the CTS flow is enabled, the transmitter does not
check the nCTS input state to send a break.
28.5

USART interrupts

Transmit Data Register Empty
CTS flag
Transmission Complete
Received Data Ready to be Read
Overrun Error Detected
Idle Line Detected
Parity Error
Break Flag
Noise Flag, Overrun error and Framing Error
in multibuffer communication
The USART interrupt events are connected to the same interrupt vector (see
• During transmission: Transmission Complete, Clear to Send or Transmit Data Register
empty interrupt.
•
While receiving: Idle Line detection, Overrun error, Receive Data register not empty,
Parity error, LIN break detection, Noise Flag (only in multi buffer communication) and
Framing Error (only in multi buffer communication).
These events generate an interrupt if the corresponding Enable Control Bit is set.

Table 172. USART interrupt requests

Interrupt event
RM0430 Rev 8
Event flag Enable control bit
TXE TXEIE
CTS CTSIE
TC TCIE
RXNE
RXNEIE
ORE
IDLE IDLEIE
PE PEIE
LBD LBDIE
NF or ORE or FE EIE
Figure 316).
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