Figure 239. I2C Block Diagram For Stm32F40X/41X - STMicroelectronics STM32F405 Reference Manual

Inter-integrated circuit (I
SDA
SCL
SMBA
832/1731
2
C) interface
2
Figure 239. I C block diagram for STM32F40x/41x
Data
control
Clock
control
Clock control
Register (CCR)
Control registers
(CR1&CR2)
Status registers
(SR1&SR2)
DocID018909 Rev 11
Data register
Data shift register
Comparator
Own address register
Dual address register
PEC register
Control
logic
Interrupts DMA requests & ACK
RM0090
PEC calculation