參數(shù)資料
型號: ST72774S9T1/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封裝: TQFP-44
文件頁數(shù): 102/144頁
文件大小: 1280K
代理商: ST72774S9T1/XXX
ST72774/ST727754/ST72734
60/144
Figure 41. Moire Output (instead of Clamping Output)
4.4.5.1 Blanking output signal
The Video Blanking function uses VSYNCO,
HFBACK,
VFBACK
as
input
signals
and
BLANKOUT output as Video Blanking Output. This
output pin is a 5V open-drain output and can be
AND-wired with any external video blanking signal.
Note: HFBACK, VFBACK, VSYNCO signals must have
positive polarity.
To use the video blanking signal:
– Program the polarity:
BLKINV bit in POLR register
– Enable the BLANKOUT output:
BLKEN bit in ENR register
Figure 42. Video Blanking Stage Simplified Schematic
HFBACK
Moire
VFBACK
BLANKOUT
BLKEN
HFBACK
VFBACK
VSYNCO
To Edge detector (LATR)
R
S
To Edge detector (LATR)
BLKINV
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