参数资料
型号: ST72774S9T1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 17/144页
文件大小: 1280K
代理商: ST72774S9T1/XXX
ST72774/ST727754/ST72734
113/144
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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