参数资料
型号: ST72T774S9T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 6/144页
文件大小: 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
103/144
Figure 63. DDC1/2B Operation Flowchart
SDA Hi-Z
Vsync Counter = 0
Start 2-sec Timer
N
Y
SCL
N
Received valid
Device Address?
Y
N
Vsync Counter += 1
Counter = 128
or Timer expired ?
Send Next Bit
Relative Address (ALR) = 0
Wait for HWPE = 1
Vsync Counter = 0
Re-Start 2-sec Timer
Y
N
D
DC1
mode
DDC
2B
m
ode
Tr
ansit
ion
m
ode
HWPE bit = 0
Vsync
SCL
CF0 = 0
Vsync
N
Y
N
Received valid
Device Address?
N
Respond to Command
Send Acknowledge
Y
Relative Address (ALR) = 0
CF2 = 0 ?
and
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