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AM24LC21BIN データシート(PDF) 7 Page - List of Unclassifed Manufacturers

部品番号 AM24LC21BIN
部品情報  Dual Mode, 1K-bits (128 x 8) 2-Wire Serial EEPROM
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AM24LC21B
Dual Mode, 1K-bits (128 x 8) 2-Wire Serial EEPROM
(Preliminary)
Anachip Corp.
www.anachip.com.tw
Rev 0.1 Jul 2, 2003
7/13
SCL
SDA
(A)
(C)
(D)
(D)
(B)
(A)
START
Condition
Address or
acknowledge
valid
Data allowed to change
STOP
condition
Figure 3-3. Data transfer sequence on the serial bus
3.1.4 Data Valid (D)
The state of the data line represents valid data
when, after a START condition, the data line is
stable for the duration of the HIGH period of the
clock signal. The data on the line must be changed
during the LOW period of the clock signal. There is
one clock pulse per bit of data. Each data transfer
is initiated with a START condition and terminated
with a STOP condition. The number of the data
bytes transferred between the START and STOP
conditions is determined by the master device and
is theoretically unlimited, although only the last
eight will be stored when doing a write operation.
When an overwrite does occur it will replace data in
a first in first out fashion.
3.1.5 Acknowledge
Each receiving device, when addressed, is obliged
to generate an acknowledge after the reception of
each byte. The master device must generate an
extra clock pulse which is associated with this
acknowledge bit.
Note:
The
AM24LC21B
does
not
generate
any
acknowledge bits if an internal programming cycle
is in progress.
The device that acknowledges has to pull down the
SDA line during the acknowledge clock pulse in
such a way that the SDA line is stable LOW during
the HIGH period of the acknowledge related clock
pulse. Of course, setup and hold times must be
taken into account. A master must signal an end of
data to the slave by not generating an acknowledge
bit on the last byte that has been clocked out of the
slave. In this case, the slave must leave the data
line HIGH to enable the master to generate the
STOP condition.
SCL
SDA
START
STOP
T
SU(STP)
V
HYS
T
HD(ST)
T
SU(ST)
Figure 3-4. Bus timing start/stop


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