Universal synchronous receiver transmitter (USART) /universal asynchronous receiver transmit-
668/771 RM0401 Rev 3
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.
24.5 USART interrupts
The USART interrupt events are connected to the same interrupt vector (see Figure 238).
• 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 122. USART interrupt requests
Interrupt event Event flag Enable control bit
Transmit Data Register Empty TXE TXEIE
CTS flag CTS CTSIE
Transmission Complete TC TCIE
Received Data Ready to be Read RXNE
RXNEIE
Overrun Error Detected ORE
Idle Line Detected IDLE IDLEIE
Parity Error PE PEIE
Break Flag LBD LBDIE
Noise Flag, Overrun error and Framing Error
in multibuffer communication
NF or ORE or FE EIE
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