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Philips Semiconductors
PCF8582C-2
256 × 8-bit CMOS EEPROM with I 2 C-bus interface
8.1.5
Read operations
Read operations are initiated in the same manner 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.
Remark: The lower 8 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
de?ned in the slave address, is not changed when the word address count over?ows.
Thus, the word address over?ows from 255 to 0, and from 511 to 256.
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from master
S
SLAVE ADDRESS
0 A
WORD ADDRESS
A
S
SLAVE ADDRESS
1 A
DATA
A
R/W
at this moment master
transmitter becomes
master receiver and
R/W
n bytes
auto increment
word address
EEPROM slave receiver
becomes slave transmitter
no acknowledge
from master
DATA
last byte
1
P
MBA703
auto increment
word address
Fig 7. Master reads PCF8582C-2 slave after setting word address (write word address; read data);
sequential read.
acknowledge
from slave
acknowledge
from master
no acknowledge
from master
S
SLAVE ADDRESS
1 A
DATA
A
DATA
1
P
R/W
n bytes
auto increment
word address
last bytes
auto increment
word address
MBA704 - 1
Fig 8. Master reads PCF8582C-2 immediately after ?rst byte (read mode); current address read.
9397 750 14222
? Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 04 — 25 October 2004
9 of 21
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