Figure 302. Transfer Sequence Flow For Smbus Slave Receiver N Bytes + Pec - STMicroelectronics STM32WL5 Series Reference Manual

RM0453

Figure 302. Transfer sequence flow for SMBus slave receiver N bytes + PEC

SMBus slave
reception
Slave initialization
No
I2C_ISR.ADDR =
1?
Yes
Read ADDCODE and DIR in I2C_ISR
I2C_CR2.NBYTES = 1, RELOAD =1
PECBYTE=1
Set I2C_ICR.ADDRCF
I2C_ISR.RXNE =1?
I2C_ISR.TCR = 1?
Yes
Read I2C_RXDR.RXDATA
Program I2C_CR2.NACK = 0
I2C_CR2.NBYTES = 1
N = N - 1
N = 1?
Yes
Read I2C_RXDR.RXDATA
Program RELOAD = 0
NACK = 0 and NBYTES = 1
No
I2C_ISR.RXNE =1?
Yes
Read I2C_RXDR.RXDATA
End
RM0453 Rev 5
Inter-integrated circuit (I2C) interface
No
No
SCL
stretched
MS19868V2
1089/1450
1113