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Remark: Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).

It is assumed that the command byte has previously been set to ‘00’ (read Input Port register).

Fig 11. Read Input Port register, scenario 1

1

0

0

A2 A1 A0

1

A

S0

START condition

R/W

acknowledge

from slave

002aac223

A

SCL

SDA

A

read from port 0

P

9

8

7

6

5

4

3

2

1

I0.x

slave address

6543210

7

STOP condition

acknowledge

from master

A

I1.x

6543210

7

acknowledge

from master

A

I0.x

6543210

7

acknowledge

from master

1

I1.x

6543210

7

non acknowledge

from master

data into port 0

read from port 1

data into port 1

INT