參數(shù)資料
型號(hào)： X1226V8IZT1
廠商： Intersil
文件頁(yè)數(shù)： 5/25頁(yè)
文件大?。?/td> 0K
描述： IC RTC/CALENDAR/ALARM 4K 8-TSSOP
標(biāo)準(zhǔn)包裝： 1
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 2.7 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 8-TSSOP
包裝： 剪切帶 (CT)
其它名稱： X1226V8IZT1CT
13
FN8098.3
May 8, 2006
A write to a protected block of memory is ignored, but
will still receive an acknowledge. At the end of the
write command, the X1226 will not initiate an internal
write cycle, and will continue to ACK commands.
Page Write
The X1226 has a page write operation. It is initiated in
the same manner as the byte write operation; but
instead of terminating the write cycle after the first data
byte is transferred, the master can transmit up to 63
more bytes to the memory array and up to 7 more
bytes to the clock/control registers. (Note: Prior to writ-
ing to the CCR, the master must write a 02h, then 06h
to the status register in two preceding operations to
enable the write operation. See “Writing to the
Clock/Control Registers.”
After the receipt of each byte, the X1226 responds
with an acknowledge, and the address is internally
incremented by one. When the counter reaches the
end of the page, it “rolls over” and goes back to the
first address on the same page. This means that the
master can write 64 bytes to a memory array page or 8
bytes to a CCR section starting at any location on that
page. For example, if the master begins writing at
location 60 of the memory and loads 30 bytes, then
the first 23 bytes are written to addresses 40 through
63, and the last 7 bytes are written to columns 0
through 6. Afterwards, the address counter would
point to location 7 on the page that was just written. If
the master supplies more than the maximum bytes in
a page, then the previously loaded data is over written
by the new data, one byte at a time. Refer to Figure 8.
The master terminates the Data Byte loading by issu-
ing a stop condition, which causes the X1226 to begin
the nonvolatile write cycle. As with the byte write oper-
ation, all inputs are disabled until completion of the
internal write cycle. Refer to Figure 9 for the address,
acknowledge, and data transfer sequence.
Stops and Write Modes
Stop conditions that terminate write operations must be
sent by the master after sending at least 1 full data byte
and it’s associated ACK signal. If a stop is issued in the
middle of a data byte, or before 1 full data byte + ACK is
sent, then the X1226 resets itself without performing the
write. The contents of the array are not affected.
Figure 9. Page Write Sequence
Word
Address 0
S
t
a
r
t
S
t
o
p
Slave
Address
Word
Address 1
Data
(n)
A
C
K
A
C
K
A
C
K
SDA Bus
Signals from
the Slave
Signals from
the Master
0
Data
(1)
A
C
K
1
≤ n ≤ 64 for EEPROM array
1
≤ n ≤ 8 for CCR
1
000 0 0 0 0
X1226
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