2000 Feb 15

10

Philips Semiconductors

Product specification

256

× 8-bit CMOS EEPROMs with

PCF85102C-2; PCF85103C-2

8.5

Read operations

The read operations are initiated in the same way as write

operations, with the exception that the LSB of the slave

address is set to logic 1.

There are three basic read operations; current address

read, random read and sequential read sequential read.

8.5.1

The lower eight bits of the word address are incremented

after each transmission of a data byte (read or write).

The MSB of the word address, which is defined in the

slave address, is not changed when the word address

count overflows. Thus, the word address overflows from

255 to 0.

handbook, full pagewidth

S0 A

SLAVE ADDRESS

WORD ADDRESS

A

A

SLAVE ADDRESS

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

R/W

acknowledge

from master

A

DATA

auto increment

word address

MBA703 - 1

P

no acknowledge

from master

1

DATA

auto increment

word address

last byte

R/W

S1

n bytes

at this moment master

transmitter becomes

master receiver and

EEPROM slave receiver

becomes slave transmitter

Fig.8 Master reads PCF8510xC-2 slave after setting word address (write word address; read data).

handbook, full pagewidth

S

1A

SLAVE ADDRESS

DATA

A1

DATA

acknowledge

from slave

acknowledge

from master

no acknowledge

from master

R/W

auto increment

word address

MBA704 - 1

auto increment

word address

n bytes

last bytes

P

Fig.9 Master reads PCF8510xC-2 immediately after first byte (read mode).