Serial Data I/O Methods

Data is input to and output from the LC72151V using the Sanyo CCB (Computer Control Bus) format, which is the serial

bus format used by SANYO audio ICs. This IC adopts a CCB format with an 8-bit address.

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LC72151V

I/O mode

Address

Content

B0

B1

B2

B3

A0

A1

A2

A3

• Control data input (serial input) mode.

[1]

IN1 (82)

0

0

0

1

0

1

0

0

• 32 bits of data are input.

• See the “DI Control Data (Serial Data Input) Structure” item for details on the content of

the input data.

• Control data input (serial input) mode.

[2]

IN2 (92)

1

0

0

1

0

1

0

0

• 32 bits of data are input.

• See the “DI Control Data (Serial Data Input) Structure” item for details on the content of

the input data.

• Data output (serial data output) mode.

[3]

OUT (A2)

0

1

0

1

0

1

0

0

• The number of bits output is equal to the number of clock cycles.

• See the “DO Output Data (Serial Data Output) Structure” item for details on the content

of the output data.

Fir

I/O mode determined

st Data IN1/2

First Data OUT

First Data OUT

A3

A2

A1

A0

B3

B2

B1

B0

DI

CE

1

CL

CL: Normally Hi

CL: Normally Low

DO

2

1

1

2

2

Continued from preceding page.

Pin No.

Symbol

Usage

Function

Pin circuit

• Output buffer for the crystal oscillator circuit

• When XB in the serial data is set to 1, the output buffer operates and

the crystal oscillator signal (a pulse signal) is output.

When XB is 0, XBUF outputs a low level.

After the power-on reset, the output buffer is fixed at the low level.

4

XBUF

Crystal oscillator buffer

XOUT