STM32F446RC datasheet(34/202 Pages) STMICROELECTRONICS

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Functional overview

STM32F446xC/E

34/202

DocID027107 Rev 6

3.23

Universal synchronous/asynchronous receiver transmitters

(USART)

The devices embed four universal synchronous/asynchronous receiver transmitters

(USART1, USART2, USART3 and USART6) and four universal asynchronous receiver

transmitters (UART4, and UART5).

These six interfaces provide asynchronous communication, IrDA SIR ENDEC support,

multiprocessor communication mode, single-wire half-duplex communication mode and

have LIN Master/Slave capability. The USART1 and USART6 interfaces are able to

communicate at speeds of up to 11.25 Mbit/s. The other available interfaces communicate

at up to 5.62 bit/s.

USART1, USART2, USART3 and USART6 also provide hardware management of the CTS

and RTS signals, Smart Card mode (ISO 7816 compliant) and SPI-like communication

capability. All interfaces can be served by the DMA controller.

3.24

Serial peripheral interface (SPI)

The devices feature up to four SPIs in slave and master modes in full-duplex and simplex

communication modes. SPI1, and SPI4 can communicate at up to 45 Mbits/s, SPI2 and

SPI3 can communicate at up to 22.5 Mbit/s. The 3-bit prescaler gives 8 master mode

frequencies and the frame is configurable to 8 bits or 16 bits. The hardware CRC

generation/verification supports basic SD Card/MMC modes. All SPIs can be served by the

DMA controller.

Table 8. USART feature comparison(1)

USART

name

Standard

features

Modem

(RTS/CTS)

LIN

SPI

maste

irD

Smartcard

(ISO 7816)

Max. baud

rate in Mbit/s

(oversamplin

g by 16)

Max. baud

rate in Mbit/s

(oversamplin

g by 8)

APB

mapping

USART1

5.62

11.25

APB2

(max.

90 MHz)

USART2

2.81

5.62

APB1

(max.

45 MHz)

USART3

2.81

5.62

APB1

(max.

45 MHz)

UART4

2.81

5.62

APB1

(max.

45 MHz)

UART5

2.81

5.62

APB1

(max.

45 MHz)

USART6

5.62

11.25

APB2

(max.

90 MHz)

1. X = feature supported.

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