1997 Oct 21

20

Philips Semiconductors

Product specification

PCF8584

The diagrams (Figs 10 to 13) illustrate typical timing diagrams for the PCF8584 in master/slave functions. For detailed

ordering number 9398 393 40011.

Fig.10 Bus timing diagram; master transmitter mode.

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MBE709

STOP

condition

interrupt

ACK

nbyte

ACK

interrupt

first-byte (E4H)

interrupt

R/W = 0

ACK

7-bit address (76H)

START

condition

from slave receiver

SDA

SCL

INT

Master PCF8584 writes data to slave transmitter.

Fig.11 Bus timing diagram; master receiver mode.

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MBE710

STOP

condition

no ACK

nbyte

ACK

interrupt

first-byte (discard)

interrupt

R/W = 1

ACK

7-bit address (76H)

START

condition

from slave

SDA

SCL

INT

'DUMMY READ'

must be executed here

from master

receiver

Master PCF8584 reads data from slave transmitter.