BU9414FV Datasheet, PDF (8/61 Pages) Rohm – 32bit Audio DSP

BU9414FV
Technical Note
Writing procedure
Step Clock
Master
Slave(BU9414FV)
Note
1
Start Condition
2
7 Slave Address
3
1 R/W (0)
&h80 (&h82)
4
1
Acknowledge
5
8 Select Address
Writing object register 8 bit
6
1
Acknowledge
7
8 Data
Writing data 8 bit
8
1
Acknowledge
9
Stop Condition
- The select address add +1 by auto increment function when the data is transferred continuously.
Repeat of Step 7~8.
1-2. Data readout
First of all, the readout target address(ex.&h20h) is written in &hD0 address register at the time of readout.
In the following stream, data is read out after the slave address. Please do not return the acknowledge when ending the
reception.
S Slave Address A Req_Addr
（example） 80h
D0h
A Select Address A P
20h
S Slave Address A Data 1
A Data 2
A
A Data N
ĀP
（example） 81h
**h
**h
**h
： Master to slave，
： Slave to master， A：With acknowledge， Ā：without acknowledge
Readout Procedure
Step Clock
Master
Slave(BU9414FV)
Note
1
Start Condition
2
7 Slave Address
3
1 R/W (0)
&h80 (&h82)
4
1
5
8 Req_Addr
Acknowledge
Address for I²C readout &hD0
6
1
Acknowledge
7
8 Select Address
Readout object register 8 bit
8
1
Acknowledge
9
1 Stop Condition
10
1 Start Condition
11
7 Slave Address
12
1 R/W (1)
&h81 (&h82)
13
1
Acknowledge
14
8
Data
Readout data 8 bit
15
1 Acknowledge
16
Stop Condition
○ The select address adds +1 by auto increment function when continuous data is transferred.
Repeat Step14~15.
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2012.03 - Rev.A