Figure 286. Transfer Sequence Flow For Slave Receiver With Nostretch = 0 - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
Slave receiver
RXNE is set in I2C_ISR when the I2C_RXDR is full, and generates an interrupt if RXIE is
set in I2C_CR1. RXNE is cleared when I2C_RXDR is read.
When a STOP is received and STOPIE is set in I2C_CR1, STOPF is set in I2C_ISR and an
interrupt is generated.

Figure 286. Transfer sequence flow for slave receiver with NOSTRETCH = 0

Inter-integrated circuit (I2C) interface
Slave reception
Slave initialization
No
I2C_ISR.ADDR
=1?
Yes
Read ADDCODE and DIR in I2C_ISR
Set I2C_ICR.ADDRCF
I2C_ISR.RXNE
=1?
Yes
Write I2C_RXDR.RXDATA
RM0453 Rev 5
SCL
stretched
No
MS19855V2
1067/1450
1113