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Universal synchronous asynchronous receiver transmitter (USART)
29.4
USART implementation
USART
(1)
modes/features
Hardware flow control for
modem
Continuous
communication using
DMA
Multiprocessor
communication
Synchronous mode
Smartcard mode
Single-wire Half-duplex
communication
IrDA SIR ENDEC block
LIN mode
Dual clock domain and
wakeup from Stop mode
Receiver timeout
interrupt
Modbus communication
Auto baud rate detection
Driver Enable
USART data length
1. X = supported.
2. CK output is disabled when UE bit = 0.
3. With the following limitation for STM32F302xB/C: If the USART is used in smartcard mode and the card cannot use the
default communication parameters after Answer To Reset and doesn't support clock stop, it is not possible to use CK to clock
the card. This is due to the fact that the USART and its clock output must be disabled while reprogramming some of the
parameters.
4.
CK is always available when CLKEN = 1, regardless of the UE bit value.
837/1080
Table 152. STM32F302xx USART features
STM32F302xB/C
USART1/
USART2/
UART4
UART5
USART3
X
-
X
X
X
X
X
-
(2)(3)
X
-
X
X
X
X
X
X
X
X
X
X
X
X
X
-
(4 modes)
X
-
8 and 9 bits
DocID025202 Rev 7
STM32F302xD/E
USART1/
USART2/
UART4
USART3
-
X
-
-
X
X
X
X
X
-
X
-
(4)
-
X
-
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
-
-
(4 modes)
-
X
-
7, 8 and 9 bits
RM0365
STM32F302x6/8
USART2/
UART5
USART1
USART3
-
X
-
X
X
X
-
X
(4)
-
X
X
X
X
X
X
X
X
X
X
X
X
X
X
-
(4 modes)
-
X
7, 8 and 9 bits
X
X
X
X
-
X
-
-
-
-
-
-
X
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