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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).

This figure eliminates the command byte transfer and a restart between the initial slave address call and the actual data transfer from P port (see Figure 9).

Fig 11. Read input port register, scenario 2

1101

A1 A0

1

A

S1

START condition

R/W

acknowledge

from slave

002aah408

A

SCL

SDA

A

read from port 0

P

9

8

7

6

5

4

3

2

1

I0.x

slave address

STOP condition

acknowledge

from master

A

I1.x

acknowledge

from master

A

I0.x

acknowledge

from master

1

I1.x

non acknowledge

from master

data into port 0

read from port 1

data into port 1

INT

DATA 00

DATA 10

DATA 03

DATA 12

DATA 00

DATA 01

DATA 02

DATA 03

DATA 10

DATA 11

DATA 12