ST STM32G473

Inter-integrated circuit (I2C) interface RM0440
1906/2126 RM0440 Rev 4
Figure 658. Bus transfer diagrams for SMBus master receiver
MS19872V2
Example SMBus master receiver 2 bytes + PEC, automatic end mode (STOP)
Address
S
INIT: program Slave address, program NBYTES = 3, AUTOEND=1, set PECBYTE, set START
EV1: RXNE ISR: rd data1
EV2: RXNE ISR: rd data2
EV3: RXNE ISR: rd PEC
A
data1
A
RXNE RXNE
data2
A
NBYTES
NA
legend:
transmission
reception
SCL stretch
3VE1VE
xx 3
INIT
Example SMBus master receiver 2 bytes + PEC, software end mode (RESTART)
Address
S
INIT: program Slave address, program NBYTES = 3, AUTOEND=0, set PECBYTE, set START
EV1: RXNE ISR: rd data1
EV2: RXNE ISR: rd data2
EV3: RXNE ISR: read PEC
EV4: TC ISR: program Slave address, program NBYTES = N, set START
A
data1
A
RXNE RXNE
data2
A
NBYTES
Restart
legend:
transmission
reception
SCL stretch
EV1 EV2
xx
INIT
Address
N
PEC
P
RXNE
EV2
NA
PEC
RXNE
3
EV3
TC
EV4