Datasheet
DocID022265 Rev 6 25/121
STM32F051x4 STM32F051x6 STM32F051x8 Functional overview
26
3.17 Universal synchronous/asynchronous receiver/transmitter
(USART)
The device embeds up to two universal synchronous/asynchronous receivers/transmitters
(USART1, USART2) which communicate at speeds of up to 6 Mbit/s.
They provide hardware management of th
e CTS, RTS and RS485 DE signals,
multiprocessor communication mode, master synchronous communication and single-wire
half-duplex communication mode. USART1 supports also SmartCard communication (ISO
7816), IrDA SIR ENDEC, LIN Master/Slave capability and auto baud rate feature, and has a
clock domain independent of the CPU clock, allowing to wake up the MCU from Stop mode.
The USART interfaces can be served by the DMA controller.
SMBus X -
Wakeup from STOP X -
1. X = supported.
Table 9. STM32F051xx I
2
C implementation (continued)
I2C features
(1)
I2C1 I2C2
Table 10. STM32F051xx USART implementation
USART modes/features
(1)
1. X = supported.
USART1 USART2
Hardware flow control for modem X X
Continuous communication using DMA X X
Multiprocessor communication X X
Synchronous mode X X
Smartcard mode X -
Single-wire half-duplex communication X X
IrDA SIR ENDEC block X -
LIN mode X -
Dual clock domain and wakeup from Stop mode X -
Receiver timeout interrupt X -
Modbus communication X -
Auto baud rate detection X -
Driver Enable X X
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