Datasheet

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STM32H743xI Functional overview
46
3.30 Inter-integrated circuit interface (I2C)
STM32H743xI devices embed four I
2
C interfaces.
The I
2
C bus interface handles communications between the microcontroller and the serial
I
2
C bus. It controls all I
2
C bus-specific sequencing, protocol, arbitration and timing.
The I2C peripheral supports:
• I
2
C-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 (PMBus
TM
) 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
3.31 Universal synchronous/asynchronous receiver transmitter
(USART)
STM32H743xI 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 6 for a summary of
USARTx and UARTx features.
These interfaces provide asynchronous c
ommunication, 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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