pca24s08a NXP Semiconductors, pca24s08a Datasheet - Page 7

• Manufacturer Part Number: pca24s08a
• Description: 1024 ? 8-bit Cmos Eeprom With Access Protection
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA24S08A_1
Product data sheet
Fig 7.
Fig 8.
S
START condition
1
Page write operation (16 bytes)
Master reads PCA24S08A slave after setting word address (write word address: read data);
sequential read
0
(cont.)
1
master receiver and EEPROM slave transmitter
0
6.3 Read operations
START condition
ReSTART
condition
S
at this moment master transmitter becomes
S
1
1
1
address
B2 B1
word
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.
The lower 7 bits of the word address are incremented after each transmission of a data
byte during a read. The three MSBs of the word address are not changed when the word
counter overflows. Thus, the word address overflows from 127 to 0, and from 255 to 128.
After the read of the last byte within a block, the internal serial address wraps around to
point at the beginning of that block.
0
0
1
1
R/W acknowledge
0
0
0
A
from slave
1
1
word address
B0
first part
B2 B1
X
P2 P1 P0 A3 A2 A1 A0
X
R/W
R/W
word address
0
1
Rev. 01 — 19 January 2010
A
acknowledge
from slave
A
acknowledge
from master
B0
P2 P1 P0 A3 A2 A1 A0
acknowledge
from slave
n bytes
DATA
word address
second part
1024 × 8-bit CMOS EEPROM with access protection
acknowledge
A
from master
auto-increment
word address
acknowledge
from slave
A
DATA
acknowledge
A
auto-increment
from slave
word address
(cont.)
(cont.)
last byte
A
DATA
no acknowledge
PCA24S08A
from master
STOP condition
auto-increment
word address
DATA + 15
DATA + 1
last byte
© NXP B.V. 2010. All rights reserved.
A
002aae793
acknowledge
acknowledge
STOP condition
auto-increment
auto-increment
from slave
from slave
word address
word address
P
A
A
002aae792
(cont.)
P
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