1999 Jan 06

7

Philips Semiconductors

Product specification

256

× 8-bit static low-voltage RAM with

PCF8570

8.5

PCF8570 WRITE and READ cycles is shown in Figs 7, 8 and 9.

Fig.7 Master transmits to slave receiver (WRITE) mode.

handbook, full pagewidth

S

0A

SLAVE ADDRESS

WORD ADDRESS

A

A

DATA

P

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from slave

R/W

auto increment

memory word address

MBD822

n bytes

Fig.8 Master reads after setting word address (WRITE word address; READ data).

handbook, full pagewidth

S

0A

SLAVE ADDRESS

WORD ADDRESS

A

A

SLAVE ADDRESS

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from slave

R/W

acknowledgement

from master

A

DATA

auto increment

memory word address

MLB930

P

no acknowledgement

from master

1

DATA

auto increment

memory word address

last byte

R/W

S1

n bytes

at this moment master -

transmitter becomes

master - receiver and

PCF8570 slave -

receiver becomes

slave - transmitter