Universal synchronous asynchronous receiver transmitter (USART) UM0306
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Bit 3
HDSEL: Half-Duplex Selection.
Selection of Single-wire Half-duplex mode
0: Half duplex mode is not selected
1: Half duplex mode is selected
Bit 2
IRLP: IrDA Low-Power.
This bit is used for selecting between normal and low-power IrDA modes
0: Normal mode
1: Low-power mode
Bit 1
IREN: IrDA mode Enable.
This bit is set and cleared by software.
0: IrDA disabled
1: IrDA enabled
Bit 0
EIE: Error Interrupt Enable.
Error Interrupt Enable Bit is required to enable interrupt generation in case of a
framing error, overrun error or noise error (FE=1 or ORE=1 or NE=1 in the
USART_SR register) in case of Multi Buffer Communication (DMAR=1 in the
USART_CR3 register).
0: Interrupt is inhibited
1: An interrupt is generated whenever DMAR=1 in the USART_CR3 register and
FE=1 or ORE=1 or NE=1 in the USART_SR register.