參數(shù)資料
型號(hào)： PCF8522ET
英文描述： I2C Serial EEPROM
中文描述： I2C串行EEPROM的
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 179K
代理商： PCF8522ET
1997 Feb 13
10
Philips Semiconductors
Product specification
256 to 1024
×
8-bit CMOS EEPROMs with
I
2
C-bus interface
PCF85xxC-2 family
8.5
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 sequential read.
8.5.1
R
EMARK
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 defined in the slave address,
is not changed when the word address count overflows.
Thus, the word address overflows from 255 to 0 and from
511 to 256.
Fig.8 Master reads PCF85xxC-2 slave after setting word address (write word address; read data).
handbook, full pagewidth
S
0 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
S
1
n bytes
at this moment master
transmitter becomes
master receiver and
EEPROM slave receiver
becomes slave transmitter
Fig.9 Master reads PCF85xxC-2 immediately after first byte (read mode).
handbook, full pagewidth
S
1 A
SLAVE ADDRESS
DATA
A
1
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
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