STM32F412RGH6P datasheet(37/201 Pages) STMICROELECTRONICS

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STM32F412xE/G

Functional overview

3.25

Universal synchronous/asynchronous receiver transmitters

(USART)

The devices embed four universal synchronous/asynchronous receiver transmitters

(USART1, USART2, USART3 and USART6).

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

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

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

communicate at speeds of up to 12.5 Mbit/s. USART2 and USART3 interfaces

communicate at up to 6.25 bit/s.

All USART interfaces 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.

3.26

Serial peripheral interface (SPI)

The devices feature five SPIs in slave and master modes in full-duplex and simplex

communication modes. SPI1, SPI4 and SPI5 can communicate at up to 50 Mbit/s, SPI2 and

SPI3 can communicate at up to 25 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.

The SPI interfaces can be configured to operate in TI mode for communications in master

mode and slave mode.

Table 7. USART feature comparison

USART

name

Standard

features

Modem

(RTS/CTS)

LIN

SPI

master

irDA

Smartcard

(ISO 7816)

Max. baud

rate in Mbit/s

(oversampling

by 16)

Max. baud

rate in Mbit/s

(oversampling

by 8)

APB

mapping

USART1

6.25

12.5

APB2

(max.

100 MHz)

USART2

3.12

6.25

APB1

(max.

50 MHz)

USART3

(1)

3.12

6.25

APB1

(max.

50 MHz)

USART6

6.25

12.5

APB2

(max.

100 MHz)

1. The RX is not available for the UFQFPN48 package.

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