Table 233. Examples Of Timeouta Settings For Various I2Cclk Frequencies; Table 234. Examples Of Timeoutb Settings For Various I2Cclk Frequencies; (Max T Timeout = 25 Ms); (Max T Idle = 50 Μs) - ST STM32WL55JC Reference Manual

Inter-integrated circuit (I2C) interface
Figure 301. Transfer sequence flowchart for SMBus slave receiver N Bytes + PEC
1092/1454
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 2
No
No
RM0453
SCL
stretched
MS19868V2