ST72774 datasheet(113/144 Pages) STMICROELECTRONICS

Part #	ST72774

Description	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

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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113 / 144 page

ST72774/ST727754/ST72734

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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.

ADD7

ADD6

ADD5

ADD4

ADD3

ADD2

ADD1

ADD0

ST72774 Datasheet(PDF) 113 Page - STMicroelectronics