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ST72774 Datasheet(PDF) 113 Page - STMicroelectronics

No. de pieza ST72774
Descripción Electrónicos  8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
PDF  144 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72774 Datasheet(HTML) 113 Page - STMicroelectronics

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DDC INTERFACE (Cont’d)
DDC DATA REGISTER (DR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D7-D0
8-bit Data Register.
These bits contain the byte to be received or
transmitted on the bus.
– Transmitter mode: Byte transmission start auto-
matically when the software writes in the DR reg-
ister.
– Receiver mode: the first data byte is received au-
tomatically in the DR register using the least sig-
nificant bit of the address.
Then, the next data bytes are received one by
one after reading the DR register.
DDC OWN ADDRESS REGISTER (OAR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:1 = ADD7-ADD1
Interface address.
These bits define the I2C bus programmable
address of the interface. They are not cleared
when the interface is disabled (PE=0).
Bit 0 = ADD0
.
This bit is Don’t Care, the interface acknowledges
either 0 or 1. It is not cleared when the interface is
disabled (PE=0).
Note: Address 01h is always ignored.
70
D7
D6
D5
D4
D3
D2
D1
D0
70
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
ADD0



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