Inter-Integrated Circuit (IIC)
MCF51CN128 Reference Manual, Rev. 6
Freescale Semiconductor
17-11
Reading the IICD returns the last byte received while the IIC is configured in either master receive or slave
receive modes. The IICD does not reflect every byte that is transmitted on the IIC bus, nor can software
verify that a byte has been written to the IICD correctly by reading it back.
In master transmit mode, the first byte of data written to IICD following assertion of MST (Start bit) or
assertion of RSTA bit (repeated Start ) is used for the address transfer and should comprise of the calling
address (in bit 7 to bit 1) concatenated with the required R/W bit (in position bit 0).
