參數(shù)資料
型號(hào)： M37274MA-052SP
廠商： Mitsubishi Electric Corporation
英文描述： PHOTO SM DETECTOR
中文描述： 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器
文件頁數(shù)： 47/147頁
文件大小： 2042K
代理商： M37274MA-052SP
47
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
(8) Clock run-in determination circuit
This circuit sets a window in the clock run-in portion in the composite
video signal, and then determinates clock run-in by counting the
number of pulses in this window. Set the time from a falling of the
horizontal synchronizing signal to a start of the window by bits 0 to 5
of the window register (address 00E2
16
; refer to Figure 43). The
window ends according to the contents of the setting of the start bit
position register (refer to Figure 40).
Fig. 43. Window Register
b7 b6 b5 b4 b3 b2 b1 b0
0
0
Window register (WN) [Address 00E2
16
]
Window Register
0
to
5
0
R W
0
R W
Window start time
(WN0 to WN5)
6, 7 Fix these bits to “0.”
B
After reset
Functions
Name
R W
ime from a falling of the horizontal
synchronous signal to start of the
window =
4
set value (“00
16
” to “3F
16
”)
reference clock period
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