STM32F051K4 datasheet(24/104 Pages) STMICROELECTRONICS

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Functional overview

STM32F051x

24/105

Doc ID 022265 Rev 3

3.17

Universal synchronous/asynchronous receiver transmitters

(USART)

The device embeds up to two universal synchronous/asynchronous receiver transmitters

(USART1 and USART2), which communicate at speeds of up to 6 Mbit/s.

They provide hardware management of the CTS, RTS and RS485 DE signals,

multiprocessor communication mode, master synchronous communication and single-wire

half-duplex communication mode. The USART1 supports also SmartCard communication

(ISO 7816), IrDA SIR ENDEC, LIN Master/Slave capability, auto baud rate feature and has a

clock domain independent from the CPU clock, allowing the USART1 to wake up the MCU

from Stop mode.

The USART interfaces can be served by the DMA controller.

Refer to Table 10 for the differences between USART1 and USART2.

3.18

Serial peripheral interface (SPI)/Inter-integrated sound

interfaces (I2S)

Up to two SPIs are able to communicate up to 18 Mbits/s in slave and master modes in full-

duplex and simplex communication modes. The 3-bit prescaler gives 8 master mode

frequencies and the frame size is configurable from 4 bits to 16 bits.

One standard I2S interface (multiplexed with SPI1) supporting four different audio standards

can operate as master or slave at simplex communication mode. It can be configured to

transfer 16 and 24 or 32 bits with16-bit or 32-bit data resolution and synchronized by a

specific signal. Audio sampling frequency from 8 kHz up to 192 kHz can be set by 8-bit

Table 10.

STM32F051x USART implementation

USART modes/features(1)

X = supported.

USART1

USART2

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

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