The client data register I/O
location (DATA.DATA) provides access to the host transmit
and receive data buffers. Reading valid data or writing data to be transmitted can be
successfully done only when SCL is held low by the client
(STATUS.CLKHOLD is set). An exception occurs when reading the last data byte after
the stop condition has been received.
Accessing DATA.DATA auto-triggers
I2C bus operations. The operation performed depends on the state of
CTRLB.ACKACT, CTRLB.SMEN and the type of access (read/write).
When CTRLC.DATA32B=1, read and write transactions from/to the DATA register are 32
bit in size. Otherwise, reads and writes are 8 bit.