參數(shù)資料
型號(hào): X1243
英文描述: Real Time Clock/Calendar/Alarm with EEPROM
中文描述: 實(shí)時(shí)時(shí)鐘/日歷/鬧鐘帶有EEPROM
文件頁數(shù): 12/18頁
文件大?。?/td> 90K
代理商: X1243
X1243
12
DEVICE ADDRESSING
Following a start condition, the master must output a
Slave Address Byte. The first four bits of the Slave
Address Byte specify access to the EEPROM array or
to the CCR. Slave bits ‘1010’ access the EEPROM
array. Slave bits ‘1101’ access the CCR.
Bit 3 through Bit 1 of the slave byte specify the device
select bits. These are set to ‘111’.
The last bit of the Slave Address Byte defines the
operation to be performed. When this R/W bit is a one,
then a read operation is selected. A zero selects a
write operation. Refer to Figure 12.
After loading the entire Slave Address Byte from the
SDA bus, the device compares the device identifier
and device select bits with ‘1010111’ or ‘1101111’.
Upon a correct compare, the device outputs an
acknowledge on the SDA line.
Following the Slave Byte is a two byte word address.
The word address is either supplied by the master
device or obtained from an internal counter. On power
up the internal address counter is set to address 0h,
so a current address read of the EEPROM array starts
at address 0. When required, as part of a random
read, the master device must supply the 2 Word
Address Bytes.
In a random read operation, the slave byte in the
“dummy write” portion must match the slave byte in
the “read” section. That is if the random read is from
the array the slave byte must be ‘1010111x’ in both
instances. Similarly, for a random read of the Clock/
Control Registers, the slave byte must be ‘1101111x’
in both places.
Figure 12. 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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X1243S8 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Real Time Clock/Calendar/Alarm with EEPROM
X1243S8I 制造商:Intersil Corporation 功能描述: 制造商:XICOR 功能描述:
X1243V8 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Real Time Clock/Calendar/Alarm with EEPROM
X-1244 制造商:Pulse 功能描述:TRANSFORMERS - Rail/Tube
X124K 制造商:IQD Frequency Products 功能描述:CRYSTAL OSCILLATOR 8.192000MHZ