參數(shù)資料
型號： 24FC256
英文描述： 24AA256/LC256/FC256 Datasheet
中文描述： 24AA256/LC256/FC256數(shù)據(jù)表
文件頁數(shù)： 11/28頁
文件大?。?/td> 449K
代理商： 24FC256
2003 Microchip Technology Inc.
DS21203L-page 11
24AA256/24LC256/24FC256
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 24XX256 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 24XX256 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
24XX256 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
24XX256 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
internal address pointer is set. The master then issues
the control byte again but with the R/W bit set to a one.
The 24XX256 will then issue an acknowledge and
transmit the 8-bit data word. The master will not
acknowledge the transfer, though it does generate a
Stop condition, which causes the 24XX256 to discon-
tinue 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 24XX256 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 24XX256 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 sequen-
tial reads, the 24XX256 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
automatically roll over from address 7FFF to address
0000 if the master acknowledges the byte received
from the array address 7FFF.
address
pointer
will
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
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
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
24FC32-SM 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
24FC256/S15K 制造商:Microchip Technology Inc 功能描述:256K, 32K X 8, 2.5V HI-SPEED S - Gel-pak, waffle pack, wafer, diced wafer on film
24FC256/W15K 制造商:Microchip Technology Inc 功能描述:256K, 32K X 8, 2.5V HI-SPEED S - Gel-pak, waffle pack, wafer, diced wafer on film
24FC256/WF15K 制造商:Microchip Technology Inc 功能描述:256K, 32K X 8, 2.5V HI-SPEED S - Gel-pak, waffle pack, wafer, diced wafer on film
24FC256E/MF 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:256K I2C CMOS Serial EEPROM
24FC256-E/MF 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:256K I2C CMOS Serial EEPROM
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*