RM0312 datasheet(247/275 Pages) STMICROELECTRONICS

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DocID022352 Rev 3

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RM0312

Universal synchronous/asynchronous receiver transmitter (USART)

249

21.6.6

Control register 2 (USART_CR2)

Address offset: 0x05

Reset value: 0x00

654

3210

TIEN

TCIEN

RIEN

ILIEN

TEN

REN

RWU

SBK

Bit 7 TIEN: Transmitter interrupt enable

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An USART interrupt is generated whenever TXE=1 in the USART_SR register

Bit 6 TCIEN: Transmission complete interrupt enable

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An USART interrupt is generated whenever TC=1 in the USART_SR register

Bit 5 RIEN: Receiver interrupt enable

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An USART interrupt is generated whenever OR=1 or RXNE=1 in the USART_SR register

Bit 4 ILIEN: IDLE Line interrupt enable

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An USART interrupt is generated whenever IDLE=1 in the USART_SR register

Bit 3 TEN: Transmitter enable (1) (2)

This bit enables the transmitter. It is set and cleared by software.

0: Transmitter is disabled

1: Transmitter is enabled

Bit 2 REN: Receiver enable

This bit enables the receiver. It is set and cleared by software.

0: Receiver is disabled

1: Receiver is enabled and begins searching for a start bit

Bit 1 RWU: Receiver wakeup(3) (4)

This bit determines if the USART is in mute mode or not. It is set and cleared by software and can be

cleared by hardware when a wakeup sequence is recognized.

0: Receiver in active mode

1: Receiver in mute mode

Bit 0 SBK: Send break

This bit set is used to send break characters. It can be set and cleared by software. It should be set by

software, and will be reset by hardware during the STOP bit of break.

0: No break character is transmitted

1: Break character will be transmitted

1. During transmission, a “0” pulse on the TEN bit (“0” followed by “1”) sends a preamble (idle line) after the current word.

2. When TEN is set there is a 1 bit-time delay before the transmission starts.

3. Before selecting Mute mode (by setting the RWU bit) the USART must first receive a data byte, otherwise it cannot function

in Mute mode with wakeup by Idle line detection.

4. In address mark detection wakeup configuration (WAKE bit=1) the RWU bit cannot be modified by software while the

RXNE bit is set.

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