=> R0 = device address, (bit 0 set to read, clear to write)
R1 = pointer to block
R2 = size of block (bytes)
Reads from or writes to the specified I²C device (eg. the clock chip and I²C compatible devices on podules).
Possible errors include 'No acknowledge from IIC device' and 'IIC system busy' if reentered.
See PRM 1, page 944.
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