MITSUBISHI < STD. LINEAR ICs >

M62320P,FP

2/20,1998(rev) (

/ 9 )

MITSUBISHI ELECTRIC

8-BIT I/O EXPANDER for I C BUS

2

FUNCTIONAL DESCRIPTION

• In a case of a data conversion from parallel to serial.

Transmission from a master (MCU etc.)

Transmission from a slave (M62320)

All I/O setting resistors are set to low (input) in the write mode, before a parallel data is read. (All I/O

setting resistors are set to the input mode after power-on.)

• In a case of a data conversion from serial to parallel.

Transmission from a master (MCU etc.)

Transmission from a slave (M62320)

D0 to D7

output

SCL

SDA

0

1

1

1 A2 A1A0 0

A

P7P6 P5P4P3 P2P1P0 A

12

34

5678

12

34

5678

Hi-Z

start

condition slave address

I/O setting byte

SCL

SDA

01

1

1 A2 A1 A0 1

A

12

3

4

5

67

8

12

3

4

5

67

8

DATA

DATA

Hi-Z

DATA

D0 to D7

Input

(example)

slave address

start

condition

stop condition

data latch

data latch

data latch

D0

to

D7

SCL

SDA

011

1 A2 A1 A0 0

A

123

4

5

6

7

8

123

4

5

6

7

8

DATA

DATA

Hi-Z

starting

condition slave address

I/O setting byte

stop condition

Data output

Data output

D0 to D7

Output

7

All parallel data I/O terminals are set to the input-state after power-on. In case any terminals need to be set to

the output state, the corresponding terminals should be set during the write mode. This setting is hold until a

next setting.

In the write mode, 8 bits data can be transmitted from the I C BUS interface to the parallel ports continually after

the slave address and I/O setting.

In the read mode, 8 bits data can be transmitted from the parallel ports to the I C BUS interface continually after

the slave address setting.

In the case of a changing between the write- and read-mode, the data must be transmitted again from the

starting condition.

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2