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S

A

0

0A

slave address

CONTROL BYTE

A

1

Co

DATA

A

1 1

CONTROL

A

R/W

0

Co

2 bytes

DATA

A

acknowledgement

from PCF2105

MGK849

S

A

0

S

1A

DATA

A

1

P

SLAVE

ADDRESS

DATA

acknowledgement

from PCF2105

no acknowledgement

from master

R/W

n bytes

last byte

update

data pointer

(1)

2n

Fig.21 Master reads after setting word address; write word address, set RS and R/W; read data.

(1) Last data byte is a dummy byte (may be omitted).