ST STM32F40 Series Reference Manual page 791

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Universal synchronous asynchronous receiver transmitter (USART)

Bit 2 IRLP: IrDA low-power

Bit 1 IREN: IrDA mode enable

Bit 0 EIE: Error interrupt enable

This bit is used for selecting between normal and low-power IrDA modes

0: Normal mode

1: Low-power mode

This bit is set and cleared by software.

0: IrDA disabled

1: IrDA enabled

Error Interrupt Enable Bit is required to enable interrupt generation in case of a framing

error, overrun error or noise flag (FE=1 or ORE=1 or NF=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 NF=1 in the USART_SR register.

Doc ID 018909 Rev 4

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