ST STM32F100 Series Reference Manual page 641

Advanced arm-based 32-bit mcus
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RM0041
Bit 5 RXNEIE: RXNE interrupt enable
This bit is set and cleared by software.
0: Interrupt is inhibited
1: An USART interrupt is generated whenever ORE=1 or RXNE=1 in the USART_SR
register
Bit 4 IDLEIE: IDLE 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 TE: Transmitter enable
This bit enables the transmitter. It is set and cleared by software.
0: Transmitter is disabled
1: Transmitter is enabled
Note: During transmission, a "0" pulse on the TE bit ("0" followed by "1") sends a preamble
Bit 2 RE: 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
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
Note: Before selecting Mute mode (by setting the RWU bit) the USART must first receive a
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 is reset by hardware during the stop bit of break.
0: No break character is transmitted.
1: Break character is transmitted.
Universal synchronous asynchronous receiver transmitter (USART)
(idle line) after the current word, except in smartcard mode.
When TE is set, there is a 1 bit-time delay before the transmission starts.
data byte, otherwise it cannot function in Mute mode with wakeup by Idle line detection.
In Address Mark Detection wakeup configuration (WAKE bit=1) the RWU bit cannot be
modified by software while the RXNE bit is set.
RM0041 Rev 6
641/709
646

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