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MBD974

S

0

1

0

0

A2

A1

A0

0

A

start condition

DATA 1

R/W

acknowledge

from slave

A

DATA 2

A

SDA

SCL

WRITE TO

PORT

t pv

DATA OUT

FROM PORT

slave address (PCF8574)

data to port

data to port

12

345

678

acknowledge

from slave

acknowledge

from slave

t pv

DATA 2 VALID

DATA 1 VALID

Fig.11 WRITE mode (output).