bh3866as ROHM Co. Ltd., bh3866as Datasheet - Page 15

• Manufacturer Part Number: bh3866as
• Description: Dual-line Serial Control Sound Processor Ic
• Manufacturer: ROHM Co. Ltd.

(2) I
• S = Start condition (recognition of start bit)
• Slave Address = Recognition of IC. First 7 bits may consist of any data. The last bit must be LOW for writing pur-
• A = Acknowledge bit (recognition of recognition response)
• Selected Address = Selection of volume, bass, treble, or matrix surround.
• Data = Various items of volume and sound quality data.
• P = Stop condition (recognition of stop bit)
(3) Interface protocol
(Examples) q Data 1 is set as the data of the address specified by the "Selected Address" parameter.
1) Basic format
2) Auto increment (the selected address is incremented ( + 1) by the number of data)
3) Configuration which cannot be transmitted (in this case, only selected address 1 is set)
Video ICs
poses.
1bit
S
S
S
S
2
C BUS format
MSB
MSB
MSB
MSB
Slave Address
Slave Address
Slave Address
Slave Address
w Data 2 is set as the data of the address specified by the "Selected Address" parameter + 1.
e Data 3 is set as the data of the address specified by the "Selected Address" parameter + N.
CAUTION: If Selected Address 2 was sent as data following the data parameter,
8bit
LSB
the contents will be recognized as data, and not as Selected Address 2.
A
LSB
LSB
LSB
MSB
Selected Address 1
1bit
A
A
A
MSB
MSB
MSB
Selected Address
Selected Address
Selected Address
LSB
8bit
A
MSB LSB
Data
LSB
LSB
LSB
1bit
A
A
A
A
MSB
MSB LSB
MSB
MSB LSB
Selected Address 2
Data
Data
8bit
Data 1, Data 2, ..., Data N
1bit
A
A
LSB
1bit
P
P
A
MSB LSB
LSB
Data
BH3866AS
A
A
P
P
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