參數(shù)資料
型號(hào)： AD9985KSTZ-140
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 其它接口
英文描述： 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays
中文描述： SPECIALTY INTERFACE CIRCUIT, PQFP80
封裝： LEAD FREE, MS-026BEC, LQFP-80
文件頁(yè)數(shù)： 27/32頁(yè)
文件大?。?/td> 349K
代理商： AD9985KSTZ-140
AD9985
Data is read from the control registers of the AD9985 in a
similar manner. Reading requires two data transfer operations:
Rev. 0 | Page 27 of 32
The base address must be written with the R/W bit of the slave
address byte low to set up a sequential read operation.
Reading (the R/W bit of the slave address byte high) begins at
the previously established base address. The address of the read
register autoincrements after each byte is transferred.
To terminate a read/write sequence to the AD9985, a stop signal
must be sent. A stop signal comprises a low-to-high transition
of SDA while SCL is high.
A repeated start signal occurs when the master device driving
the serial interface generates a start signal without first
generating a stop signal to terminate the current communi-
cation. This is used to change the mode of communication
(read, write) between the slave and master without releasing the
serial interface lines.
Serial Interface Read/Write Examples
Write to one control register
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Data Byte to Base Address
Stop Signal
Write to four consecutive control registers
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Data Byte to Base Address
Data Byte to (Base Address + 1)
Data Byte to (Base Address + 2)
Data Byte to (Base Address + 3)
Stop Signal
Read from one control register
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Start Signal
Slave Address Byte (R/W Bit = High)
Data Byte from Base Address
Stop Signal
Read from four consecutive control registers
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Start Signal
Slave Address Byte (R/W Bit = High)
Data Byte from Base Address
Data Byte from (Base Address + 1)
Data Byte from (Base Address + 2)
Data Byte from (Base Address + 3)
Stop Signal
BIT 7
ACK
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SDA
SCL
0
Figure 13. Serial Interface—Typical Byte Transfer
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