STM32H747AI datasheet(48/252 Pages) STMICROELECTRONICS

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Functional overview

STM32H747xI/G

38/242

DS12930 Rev 1

3.31

Inter-integrated circuit interface (I2C)

STM32H747xI/G devices embed four I2C interfaces.

The I2C bus interface handles communications between the microcontroller and the serial

I2C bus. It controls all I2C bus-specific sequencing, protocol, arbitration and timing.

The I2C peripheral supports:

•

I2C-bus specification and user manual rev. 5 compatibility:

–

Slave and Master modes, multimaster capability

–

Standard-mode (Sm), with a bitrate up to 100 kbit/s

–

Fast-mode (Fm), with a bitrate up to 400 kbit/s

–

Fast-mode Plus (Fm+), with a bitrate up to 1 Mbit/s and 20 mA output drive I/Os

–

7-bit and 10-bit addressing mode, multiple 7-bit slave addresses

–

Programmable setup and hold times

–

Optional clock stretching

•

System Management Bus (SMBus) specification rev 2.0 compatibility:

–

Hardware PEC (Packet Error Checking) generation and verification with ACK

control

–

Address resolution protocol (ARP) support

–

SMBus alert

•

Power System Management Protocol (PMBusTM) specification rev 1.1 compatibility

•

Independent clock: a choice of independent clock sources allowing the I2C

communication speed to be independent from the PCLK reprogramming.

•

Wakeup from Stop mode on address match

•

Programmable analog and digital noise filters

•

1-byte buffer with DMA capability

3.32

Universal synchronous/asynchronous receiver transmitter

(USART)

STM32H747xI/G devices have four embedded universal synchronous receiver transmitters

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

transmitters (UART4, UART5, UART7 and UART8). Refer to Table 5 for a summary of

USARTx and UARTx features.

These interfaces provide asynchronous communication, IrDA SIR ENDEC support,

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

have LIN Master/Slave capability. They provide hardware management of the CTS and RTS

signals, and RS485 Driver Enable. They are able to communicate at speeds of up to

12.5 Mbit/s.

USART1, USART2, USART3 and USART6 also provide Smartcard mode (ISO 7816

compliant) and SPI-like communication capability.

The USARTs embed a Transmit FIFO (TXFIFO) and a Receive FIFO (RXFIFO). FIFO mode

is enabled by software and is disabled by default.

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