參數(shù)資料
型號(hào): X40626S14-2.7A
元件分類: CPU監(jiān)測(cè)
英文描述: RTC Module With CPU Supervisor
中文描述: 時(shí)鐘模塊CPU監(jiān)控
文件頁(yè)數(shù): 13/23頁(yè)
文件大?。?/td> 516K
代理商: X40626S14-2.7A
X40626
REV 1.1.15 2/11/04
Characteristics subject to change without notice.
13 of 23
www.xicor.com
Figure 14. Sequential Read Sequence
Data
(2)
S
t
o
p
Slave
Address
Data
(n)
A
C
K
A
C
K
SDA Bus
Signals from
the Slave
Signals from
the Master
1
Data
(n-1)
A
C
K
A
C
K
(n is any integer greater than 1)
Data
(1)
S
1
S
0
X40626 Addressing
Slave Address Byte
Following a start condition, the master must output a
Slave Address Byte. This byte consists of several parts:
– a device type identifier that is ‘1010’ to access the
array
– one bit of ‘0’.
– next two bits are the device address. (S1 and S0)
– one bit of the slave command byte is a R/W bit. The
R/W bit of the Slave Address Byte defines the opera-
tion to be performed. When the R/W bit is a one, then
a read operation is selected. A zero selects a write
operation. Refer to Figure 15.
– After loading the entire Slave Address Byte from the
SDA bus, the device compares the input slave byte
data to the proper slave byte. Upon a correct compare,
the device outputs an acknowledge on the SDA line.
Word Address
The word address is either supplied by the master or
obtained from an internal counter. The internal counter
is 00H on a power up condition.
The master must supply the two word address byte as
shown in Figure 15.
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