ST STM32F446 Series User Manual

Fast-mode Plus Inter-integrated circuit (FMPI2C) interface RM0390
734/1328 RM0390 Rev 4
Figure 268. Bus transfer diagrams for SMBus slave receiver (SBC=1)
This section is relevant only when SMBus feature is supported. Refer to Section 23.3:
FMPI2C implementation.
In addition to FMPI2C master transfer management (refer to Section 23.4.8: FMPI2C
master mode) some additional software flowcharts are provided to support SMBus.
SMBus Master transmitter
When the SMBus master wants to transmit the PEC, the PECBYTE bit must be set and the
number of bytes must be programmed in the NBYTES[7:0] field, before setting the START
bit. In this case the total number of TXIS interrupts will be NBYTES-1. So if the PECBYTE
bit is set when NBYTES=0x1, the content of the FMPI2C_PECR register is automatically
transmitted.
If the SMBus master wants to send a STOP condition after the PEC, automatic end mode
should be selected (AUTOEND=1). In this case, the STOP condition automatically follows
the PEC transmission.
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ST STM32F446 Series Specifications

General

Brand	ST
Model	STM32F446 Series
Category	Microcontrollers
Language	English