參數(shù)資料
型號(hào): PCA24S08
廠商: NXP Semiconductors N.V.
元件分類: EEPROM
英文描述: 1024 ?8-bit CMOS EEPROM with access protection
中文描述: 1024?8位CMOS EEPROM,帶有訪問保護(hù)
文件頁數(shù): 6/16頁
文件大?。?/td> 122K
代理商: PCA24S08
Philips Semiconductors
Product data
PCA24S08
1024
×
8-bit CMOS EEPROM with access protection
2004 May 10
6
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.
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.
1
B2
1
0
B1
1
0
S
0
A
A
ACKNOWLEDGE
FROM SLAVE
R/W
A0
B0
P2
P1
P0
A3 A2
A1
DATA
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM MASTER
WORD
ADDRESS
FIRST PART
WORD
ADDRESS
SECOND PART
AUTO INCREMENT
WORD ADDRESS
SW02223
P
DATA
A
AUTO INCREMENT
WORD ADDRESS
LAST BYTE
NO ACKNOWLEDGE
FROM MASTER
S
A
A
ACKNOWLEDGE
FROM MASTER
R/W
n BYTES
AT THIS MOMENT MASTER
TRANSMITTER BECOMES
MASTER RECEIVER AND
EEPROM SLAVE TRANSMITTER
1
X
1
X
1
0
1
0
Figure 7. Master reads PCA24S08 slave after setting word address (write word address: read data); sequential read
DATA
ACKNOWLEDGE
FROM SLAVE
AUTO INCREMENT
WORD ADDRESS
SW02224
P
DATA
A
AUTO INCREMENT
WORD ADDRESS
LAST BYTES
NO ACKNOWLEDGE
FROM MASTER
S
A
A
ACKNOWLEDGE
FROM MASTER
R/W
n BYTES
1
X
1
X
1
0
1
0
Figure 8. Master read PCA24S08 immediately after first byte (read mode); current address read
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