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X40626 Datasheet

  • X40626

  • Dual Voltage CPU Supervisor with 64K Serial EEPROM

  • 516.51KB

  • XICOR   XICOR

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X40626
Figure 7. Acknowledge Response From Receiver
SCL from
Master
Data Output
from Transmitter
1
8
9
Data Output
from Receiver
Start
Acknowledge
Serial Write Operations
Byte Write
For a write operation, the device requires the Slave
Address Byte and a Word Address Byte. This gives the
master access to any one of the words in the array. After
receipt of the Word Address Byte, the device responds
with an acknowledge, and awaits the next eight bits of
Figure 8. Byte Write Sequence
S
T
A
R
T
data. After receiving the 8 bits of the Data Byte, the
device again responds with an acknowledge. The mas-
ter then terminates the transfer by generating a stop
condition, at which time the device begins the internal
write cycle to the nonvolatile memory. During this inter-
nal write cycle, the device inputs are disabled, so the
device will not respond to any requests from the master.
The SDA output is at high impedance. See Figure 8.
Signals from
the Master
SDA Bus
Signals from
the Slave
Slave
Address
Word Address
Byte 1
Word Address
Byte 0
Data
S
T
O
P
P
S 1 0 1 0 0
S
1
S
0
0
A
C
K
A
C
K
A
C
K
A
C
K
A write to a protected block of memory will suppress
the acknowledge bit.
Page Write
The device is capable of a page write operation. It is
initiated in the same manner as the byte write opera-
tion; but instead of terminating the write cycle after the
鏗乺st data byte is transferred, the master can transmit an
unlimited number of 8-bit bytes. After the receipt of
each byte, the device will respond with an acknowl-
edge, and the address is internally incremented by
one. The page address remains constant. When the
counter reaches the end of the page, it 鈥渞olls over鈥?and
goes back to 鈥?鈥?on the same page. This means that the
master can write 64 bytes to the page starting at any
location on that page. If the master begins writing at
location 60, and loads 12 bytes, then the 鏗乺st 4 bytes
are written to locations 60 through 63, and the last 8
bytes are written to locations 0 through 7. Afterwards,
the address counter would point to location 8 of the
page that was just written. If the master supplies more
than 64 bytes of data, then new data over-writes the
previous data, one byte at a time.
REV 1.1.15 2/11/04
www.xicor.com
Characteristics subject to change without notice.
9 of 23

X40626 PDF文件相關(guān)型號(hào)

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