- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371396 > 24FC128 (Microchip Technology Inc.) The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each PDF資料下載
參數(shù)資料
| 型號： | 24FC128 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | EEPROM |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | 該CAT24FC02是一個(gè)2 KB的EEPROM的國內(nèi)256個(gè)8位每字舉辦的串行CMOS |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 450K |
| 代理商： | 24FC128 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當(dāng)前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁
24AA128/24LC128/24FC128
DS21191M-page 10
2004 Microchip Technology Inc.
8.0
READ OPERATION
Read operations are initiated in much the same way as
write operations with the exception that the R/W bit of
the control byte is set to ‘
1
’. There are three basic types
of read operations: current address read, random read
and sequential read.
8.1
Current Address Read
The 24XX128 contains an address counter that main-
tains the address of the last word accessed, internally
incremented by ‘
1
’. Therefore, if the previous read
access was to address ‘
n
’ (
n
is any legal address), the
next current address read operation would access data
from address
n + 1
.
Upon receipt of the control byte with R/W bit set to ‘
1
’,
the 24XX128 issues an acknowledge and transmits the
8-bit data word. The master will not acknowledge the
transfer, but does generate a Stop condition and the
24XX128 discontinues transmission (Figure 8-1).
FIGURE 8-1:
CURRENT ADDRESS
READ
8.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, the word address must first
be set. This is done by sending the word address to the
24XX128 as part of a write operation (R/W bit set to
‘
0
’
). Once the word address is sent, the master gener-
ates a Start condition following the acknowledge. This
terminates the write operation, but not before the inter-
nal address pointer is set. The master then issues the
control byte again, but with the R/W bit set to a ‘
1
’. The
24XX128 will then issue an acknowledge and transmit
the 8-bit data word. The master will not acknowledge
the transfer but does generate a Stop condition, which
causes the 24XX128 to discontinue transmission
(Figure 8-2). After a random Read command, the
internal address counter will point to the address
location following the one that was just read.
8.3
Sequential Read
Sequential reads are initiated in the same way as a
random read except that after the 24XX128 transmits
the first data byte, the master issues an acknowledge
as opposed to the Stop condition used in a random
read. This acknowledge directs the 24XX128 to
transmit the next sequentially addressed 8-bit word
(Figure 8-3). Following the final byte transmitted to the
master, the master will NOT generate an acknowledge
but will generate a Stop condition. To provide
sequential reads, the 24XX128 contains an internal
address pointer which is incremented by one at the
completion of each operation. This address pointer
allows the entire memory contents to be serially read
during one operation. The internal address pointer will
automatically roll over from address 3FFF to address
0000
if the master acknowledges the byte received
from the array address 3FFF.
FIGURE 8-2:
RANDOM READ
FIGURE 8-3:
SEQUENTIAL READ
Control
Byte
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
P
S
S
T
O
P
Control
Byte
S
T
A
R
T
Data
Byte
A
C
K
N
O
A
C
K
1
1
0
02 1 0
X X
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
A
C
K
N
O
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
S
T
A
R
T
S 1 0 1 02 1 0
Control
Byte
Address
High Byte
Address
Low Byte
Control
Byte
Data
Byte
S
T
A
R
T
S 1 0 1 02 1 0
X = don’t care bit
P
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
Data (n)
Data (n + 1)
Data (n + 2)
Data (n + X)
N
O
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
S
T
O
P
P
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24FC256 | 24AA256/LC256/FC256 Datasheet |
| 24FC32 | 32K 5.0V 1 MHz I 2 C Smart Serial EEPROM |
| 24FC32-IP | 32K 5.0V 1 MHz I 2 C Smart Serial EEPROM |
| 24FC32-ISM | 32K 5.0V 1 MHz I 2 C Smart Serial EEPROM |
| 24FC32-P | 32K 5.0V 1 MHz I 2 C Smart Serial EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24FC128-E/CS15K | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:128K I2Ca?￠ CMOS Serial EEPROM |
| 24FC128-E/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:128K I2C CMOS Serial EEPROM |
| 24FC128E/MF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EEPROM |
| 24FC128-E/MF | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:128K I2C CMOS Serial EEPROM |
| 24FC128-E/MNY | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:128K I2Ca?￠ CMOS Serial EEPROM |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。