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ABOV Semiconductor Co., Ltd.
11.9.5 Data Transfer
Every byte put on the SDA line must be 8-bits long. The number of bytes that can be transmitted per transfer is
unlimited. Each byte has to be followed by an acknowledge bit. Data is transferred with the most significant bit (MSB)
first. If a slave can’t receive or transmit another complete byte of data until it has performed some other function, it can
hold the clock line SCL LOW to force the master into a wait state. Data transfer then continues when the slave is ready
for another byte of data and releases clock line SCL.
Figure 11.38 Data Transfer on the I2C-Bus
START or Repeated
START Condition
STOP or Repeated
START Condition
Acknowledgement
Signal form Slave
Acknowledgement
Signal form Slave
Byte Complete,
Interrupt within Device
Clock line held low while
interrupts are served.
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