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OE is LOW to observe a change in the outputs.

Two, three, or four adjacent banks can be programmed by using the Auto-Increment feature (AI = 1) and change at the corresponding output port becomes effective at

each acknowledge.

Fig 12. Write to a specific output port

002aab497

0

1

0

0 A2 A1 A0 0

slave address

R/W

S

START condition

SDA

A

acknowledge

from slave

AI 0001 D2 D1 D0 A

acknowledge

from slave

DATA BANK X

A

acknowledge

from slave

P

STOP

condition

A

write to port

data out from port

data X

valid

The programming becomes effective at the acknowledge.

Less than 5 bytes can be programmed by using this scheme. D5, D4, D3, D2, D1, D0 refers to the first register to be programmed.

If more than 5 bytes are written, previous data are overwritten (the sixth Configuration register will roll over to the first addressed Configuration register, the sixth Polarity

Inversion register will roll over to the first addressed Polarity Inversion register and the sixth Mask Interrupt register will roll over to the first addressed Mask Interrupt

register).

Fig 13. Write to the I/O Configuration, Polarity Inversion or Mask Interrupt registers

002aab498

0

1

0

0 A2 A1 A0 0

slave address

R/W

S

START condition

SDA

A

acknowledge

from slave

1

0 D5 D4 D3 D2 D1 D0

command register

AI = 1

A

acknowledge

from slave

DATA BANK 0

A

DATA BANK 1

A

DATA BANK 2

A

DATA BANK 3

P

STOP

condition

A

acknowledge

from slave

DATA BANK 4

A

acknowledge

from slave

acknowledge

from slave

D[5:0] = 01 0000 for Polarity Inversion register programming bank 0

D[5:0] = 01 1000 for Configuration register programming bank 0

acknowledge

from slave

acknowledge

from slave

D[5:0] = 10 0000 for Mask Interrupt register programming bank 0