mc44bc373c Freescale Semiconductor, Inc, mc44bc373c Datasheet - Page 22

• Manufacturer Part Number: mc44bc373c
• Description: Pll Tuned Uhf And Vhf Audio/video High Integration Modulator
• Manufacturer: Freescale Semiconductor, Inc

High Speed I2C Compatible Bus
14.3 Levels Definition
14.4 High Speed I
14.5 I
The bus receiver operates the I
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 or four 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.
SDA
SCL
STA
•
•
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.
1 1 0 0 1 0 1 0 (ACK) = $CA (hex) in write mode
Example 1
Example 2
Example 3
Example 4
With:
STA = Start condition
FM = Frequency information, high order bits
C1 = Control information, high order bits
STO = Stop condition
2
C Write Mode Format and Bus Receiver
1
Chip Address ($CA)
2
3
4
STA
STA
STA
STA
Freescale Semiconductor, Inc.
SDA
5
2
For More Information On This Product,
2
C Compatible Bus Format
C compatible data format. The chip address (I
6
MC44BC373C/374C Technical Data
...
7
CA
CA
CA
CA
8
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Vcc
Vil
0V
Vih
ACK
9 10
First Data Byte (C1 or FM)
FM
FM
C1
C1
11 12 13
CA = Chip Address
FL = Frequency information, low order bits
CO = Control information, low order bits
C0
FL
C0
FL
14
dead band
15
STO
STO
FM
C1
16 17 18
ACK
C0
FL
2
C bus) is:
19
Data
STO
STO
44
ACK
45
Stop