參數(shù)資料
型號: X4C105
元件分類: CPU監(jiān)測
英文描述: RTC Module With CPU Supervisor
中文描述: 時鐘模塊CPU監(jiān)控
文件頁數(shù): 5/18頁
文件大?。?/td> 93K
代理商: X4C105
X4C105
5
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
data. After receiving the 8 bits of the Data Byte, the
device again responds with an acknowledge. The master
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 internal
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 5.
An attempted write to a protected block of memory will
suppress the acknowledge bit and the operation will
terminate.
Page Write
The device is capable of 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 an
unlimited number of 8-bit bytes. After the receipt of each
byte, the device will respond with an acknowledge, and
the address is internally incremented by one. The page
address remains constant. When the counter reaches
the end of the page, it “rolls over” and goes back to ‘0’ on
the same page. This means that the master can write 16
bytes to the page starting at any location on that page. If
the master begins writing at location 10, and loads 12
bytes, then the first 5 bytes are written to locations 10
through 15, and the last 7 bytes are written to locations 0
through 6. Afterwards, the address counter would point to
location 7 of the page that was just written. See figure 6. If
the master supplies more than 16 bytes of data, then
new data over-writes the previous data, one byte at a time.
address
n-1
address
10
5 bytes
7 bytes
address
= 6
address pointer
ends here
Addr = 7
Figure 6. Writing 12 bytes to a 16-byte page starting at location 10.
S
t
a
r
t
S
t
o
p
Slave
Address
Byte
Address
Data
A
C
K
A
C
K
A
C
K
SDA Bus
Signals from
the Slave
Signals from
the Master
0
Figure 5. Byte Write Sequence
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