µPD6222

10

I2C-BUS FORMAT

STA

SLAVE ADDRESS DATA

W

ACK

SUB ADDRESS DATA

ACK

D/A DATA

ACK

STP

•

STA : START condition

•

W

: This bit is a data-transfer direction bit. A ‘Zero’ (LOW) is set at sending a data from master to slave.

•

ACK: This is an acknowledge bit. The receiver responses a ‘Zero’ (LOW) to the transmitter when the receiver

acknowledges data reception.

•

STP : STOP condition

•

SLAVE ADDRESS DATA

First

Last

MSB

LSB

1

0

0

1

A2

A1

A0

Chip Select Data

Chip Select Data

MSB

LSB

A2

A1

A0

CS2

CS1

CS0

00

0

0

00

00

1

0

01

01

0

0

10

..

.

...

..

.

...

..

.

...

11

1

1

11

This chip will be selected only when A0,

A1 and A2 are equal to CS0, CS1 and

CS2.

DIGITAL DATA FORMAT

•

SUB ADDRESS DATA

First

Last

MSB

LSB

×××

×

S3

S2

S1

S0

Don’t care

Channel Select Data

Channel Select Data

MSB

LSB

S3

S2

S1

S0

Channel Select

0

0

0

0

Don’t care

0

0

0

1

ch1

0

0

1

0

ch2

..

.

.

.

..

.

.

.

..

.

.

.

1

0

1

1

ch11

1

1

0

0

ch12

1

1

0

1

Don’t care

11

1

0

1

1

1

1

InhibitNote

Note Internally Test Mode