High Speed I2C Compatible Bus

MC44BC373C/374C Technical Data

The first and third data bytes contain a function bit, which lets the IC distinguish between frequency

information and control information. If the function bit is a logic 1, the two following bytes contain control

information. The first data byte after the chip address, may be byte CO or byte FM. The two bytes of

frequency information are preceded by a logic 0.

The incoming information consists of the read mode chip address byte. The device then answers with an

ACK followed by one byte containing three bits of status information. No acknowledge is answered by the

modulator after this byte.

11001011 (ACK) =$CB(hex) in read mode

Freescale Semiconductor, Inc.

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