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TW2864D Folha de dados(PDF) 49 Page - Renesas Technology Corp

Nome de Peças TW2864D
Descrição Electrónicos  4-Channel Video Decoders and Audio Codecs For Security Applications
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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TW2864D Folha de dados(HTML) 49 Page - Renesas Technology Corp

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TW2864
FN7745 Rev. 0.00
Page 49 of 110
September 28, 2012
Host Interface
Serial Interface
The two wire serial bus interface is used to allow an external micro-controller to write to or read from the data through
the TW2864 register. The SCLK is the serial clock and SDAT is the data line. Both lines are pulled high by the resistors
connected to VDD. The SADD[1:0] defines two LSB of the slave device address by tying the SADD pins either to VDD or
GND.
SLAVE ADDRESS
R/W
0
1
0
1
0
SADD[1]
SADD[0]
1 = Read
0 = Write
The TW2864 supports auto index increments in write/read mode if the data are in sequential order. Data transfer
rate on the bus is up to 400 Kbits/s.
MSB
LSB
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Data
Ack
Stop
SDAT
SCLK
(a) Write Mode
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Stop
SDAT
SCLK
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Data
NoAck
Stop
“0”
“1”
(b) Read Mode
FIGURE 36. TIMING CHART OF SERIAL INTERFACE



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