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MC44BC374T1 Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc

Part No. MC44BC374T1
Description  PLL Tuned PAL/NTSC UHF and VHF Audio/Video High Integration Modulator IC
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC44BC374T1 Datasheet(HTML) 20 Page - Freescale Semiconductor, Inc

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MC44BC374T1 Technical Data
High Speed I2C Compatible Bus
14.4 High Speed I2C Compatible Bus Format
14.5 I2C Write Mode Format and Bus Receiver
The bus receiver operates the I2C compatible data format. The chip address (I2C bus) is:
In write mode, each ninth data bit (bits 9, 18, 27, 36, and 45) is an acknowledge bit (ACK) during which
the MCU sends a logic 1 and the Modulator circuit answers on the data line by pulling it low. Besides the
chip address, the circuit needs two (2) or four (4) data bytes for operation. The following sequences of data
bytes are the permitted incoming information:
After the chip address, two or four data bytes may be received.
If three data bytes are received, the third one is ignored.
If five or more data bytes are received, the fifth and following ones are ignored, and the last ACK
pulse is sent at the end of the fourth data byte.
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.
11001010 (ACK) =$CA(hex) in write mode
Example 1
STA
CA
C1
C0
STO
Example 2
STA
CA
FM
FL
STO
Example 3
STA
CA
C1
C0
FM
FL
STO
Example 4
STA
CA
FM
FL
C1
C0
STO
With:
STA = Start condition
CA = Chip Address
FM = Frequency information, high order bits
FL = Frequency information, low order bits
C1 = Control information, high order bits
CO = Control information, low order bits
STO = Stop condition
1
2
3
4
5
6
7
8
9 10
14
11 12 13
45
44
15
19
16 17 18
STA
Chip Address ($CA)
ACK
ACK
First Data Byte (C1 or FM)
Data
ACK
Stop
SCL
SDA
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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