Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual page 481

17.3.1.1 START and STOP Conditions
START and STOP conditions are used to initiate and stop transactions on the I
condition (S) and end with a STOP condition (P). As shown in
condition is generated by pulling the SDA line low while SCL is high, and a STOP condition is generated by pulling the SDA line high
while SCL is high.
The START and STOP conditions are easily identifiable bus events as they are the only conditions on the bus where a transition is
allowed on SDA while SCL is high. During the actual data transmission, SDA is only allowed to change while SCL is low, and must be
stable while SCL is high. One bit is transferred per clock pulse on the I
page 481.
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SDA
SCL
S
START condition
Figure 17.4. I2C START and STOP Conditions
SDA
SCL
Data change
allowed
Figure 17.5. I2C Bit Transfer on I
2
C-bus. All transactions on the bus begin with a START
Figure 17.4 I2C START and STOP Conditions on page
STOP condition
2
C-bus as shown in Figure 17.5 I2C Bit Transfer on I
Data change
Data stable
allowed
2
C-Bus
Reference Manual
I2C - Inter-Integrated Circuit Interface
481, a START
P
Rev. 1.1 | 481
2
C-Bus on