CM6206 C-MEDIA ELECTRONICS, CM6206 Datasheet - Page 22

• Manufacturer Part Number: CM6206
• Description: USB Audio I/O Controller
• Manufacturer: C-MEDIA ELECTRONICS

CM6206
High Integrated USB Audio I/O Controller
The figure below shows typical transactions between MCU and CM6206. After a START, MCU should send
7-bit slave address (7‟b0111000) first, and then the 8
transfer when it‟s low.
MCU write:
MCU read:
In a write transfer, MCU keeps acting as the transmitter. CM6206 regards the first DATA byte as start
register address. The second and third DATA bytes are the content that MCU writes to the register
addresses.
In a read transfer, two transactions are necessary. MCU resets start register address by the first transaction.
Then MCU changes to be the receiver during the second transaction to get four bytes of data.
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0
S
S
S
S
Byte
8‟h70
8‟h70
8‟h71
From CM6206 to MCU
START condition
Positive acknowledge
One byte data
0
0
0
Byte[0]
8‟h01
8‟h00
Figure 6-3. IIC transaction example
0
1
0
Byte[1]
Byte[1]
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th
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bit denotes a read transfer when it‟s high; or a write
P
1
0
0
Byte[2]
Byte[2]
From MCU to CM6206
STOP condition
Negative acknowledge
1
0
P
Byte[3]
1
P
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