BU9409FV_12 datasheet(7/58 Pages) ROHM

Part #	BU9409FV

Description	32bit Audio DSP

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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Technical Note

7/54

BU9409FV

www.rohm.com

2012.03 - Rev.A

1.Command interface

I

2C bus method is used in command interface with host CPU on BU9409FV.

In BU9409FV, not only writing but read-out is possible except for some registers.

Besides the slave address in BU9409FV, one byte select address can be Specified, written and readout.

The format of I

2C bus slave mode is shown below.

MSB

LSB

MSB

LSB

MSB

LSB

S

Slave Address

A

Select Address

A

Data

A

P

S: Start condition

Slave Address:

Putting up the bit of read mode (H") or write mode (L") after slave address (7bit) set with ADDR,

the data of eight bits in total will be sent. (MSB first)

A: The acknowledge bit in each byte adds into the data when acknowledge is sent and received.

When data is correctly sent and received, "L" will be sent and received.

There was no acknowledge for "H".

Select Address: 1 byte select address is used in BU9409FV. (MSB first)

Data: Data-byte, data(MSB first)sent and received

P: Stop Condition

1

1--1

1.. D

Da

atta

a w

wrriittiin

ng

g

S

Slave Address

A

Select Address

A

Data

A

P

: From master to slave

: From slave to master

ADDR=0

MSB

LSB

A6

A5

A4

A3

A2

A1

A0

R/W

1

0

ADDR=1

MSB

LSB

A6

A5

A4

A3

A2

A1

A0

R/W

1

0

1

0

S

Slave Address

A Select Address

A

Data

A

Data

A

Data

A

P

(example)

80h

20h

00h

: From master to slave

: From slave to master

Setting of BU9409FV slave address

Terminal setting

Write-mode

Slave-address

ADDR

0

80h

1

82h

SDA

SCL

MSB

6

5

LSB

Start Condition

↓

When SDA

, SCL=”H”

Stop Condition

↑

When SDA

, SCL=”H”

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