ST STM32L4x6 User Manual

Universal synchronous asynchronous receiver transmitter (USART) RM0351
1220/1693 DocID024597 Rev 3
36.6 USART low-power modes
36.7 USART interrupts
Table 197. Effect of low-power modes on the USART
Mode Description
Sleep No effect. USART interrupt causes the device to exit Sleep mode.
Low-power run No effect.
Low-power sleep
No effect. USART interrupt causes the device to exit Low-power sleep
mode.
Stop 0 / Stop 1
The USART registers content is kept. The USART is able to wake up the
MCU from Stop 0 and Stop 1 modes when the UESM bit is set and the
USART clock is set to HSI16 or LSE.
The MCU wakeup from Stop 0 and Stop 1 modes can be done using either
a standard RXNE or a WUF interrupt.
Stop 2
The USART registers content is kept. The USART must either be disabled
or put in reset state.
Standby
The USART is powered down and must be reinitialized when the device
has exited from Standby or Shutdown mode.
Shutdown
Table 198. USART interrupt requests
Interrupt event Event flag
Enable Control
bit
Transmit data register empty TXE TXEIE
CTS interrupt CTSIF CTSIE
Transmission Complete TC TCIE
Receive data register not empty (data ready to be read) RXNE
RXNEIE
Overrun error detected ORE
Idle line detected IDLE IDLEIE
Parity error PE PEIE
LIN break LBDF LBDIE
Noise Flag, Overrun error and Framing Error in multibuffer
communication.
NF or ORE or FE EIE
Character match CMF CMIE
Receiver timeout RTOF RTOIE
End of Block EOBF EOBIE
Wakeup from Stop mode WUF
(1)
1. The WUF interrupt is active only in Stop mode.
WUFIE

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English