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参数资料
型号： M3727GM8-XXXSP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封装： 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件页数： 73/129页
文件大小： 1357K
代理商： M3727GM8-XXXSP
M3727GM6/M8–XXXSP/FP M37272E8SP/FP
Rev.1.00
Apr 01, 2001
page 48 of 127
REJ03B0132-0100Z
8.10 DATA SLICER
This microcomputer includes the data slicer function for the closed
caption decoder (referred to as the CCD). This function takes out the
caption data superimposed in the vertical blanking interval of a com-
posite video signal. A composite video signal which makes the sync
chip’s polarity negative is input to the CVIN pin.
When the data slicer function is not used, the data slicer circuit and
the timing signal generating circuit can be cut off by setting bit 0 of
the data slicer control register 1 (address 00E016) to “0.” These set-
tings can realize the low-power dissipation.
Fig. 8.10.1 Data Slicer Block Diagram
Composite
video
signal
1 M
Sync pulse counter
register
(address 00E916)
Data slicer control register 2
(address 00E116)
Data slicer control register 1
(address 00E016)
Clock run-in defect register
(address 00E416)
Caption position register
(address 00E616)
Data clock position register
(address 00E516)
Interrupt request
generating circuit
Data slicer
interrupt
request
Synchronizing
signal counter
Synchronizing
separation
circuit
Sync slice
circuit
Clamping
circuit
Low-pass
filter
Timing signal
generating
circuit
Clock run-in
determination
circuit
Data slice line
specification
circuit
Start bit detecting
circuit
Data clock
generating circuit
16-bit shift register
Caption data register 1
(address 00E216)
Caption data register 2
(address 00E316)
Data bus
Comparator
0.1 F
470
560 pF
CVIN
1 F
1 k
200 pF
HSYNC
HLF
+
–
Reference
voltage
generating
circuit
VHOLD
1000 pF
high-order
low-order
Data slicer ON/OFF
Caption data register 4
(address 00CF16)
Caption data register 3
(address 00CE16)
External circuit
Note : Make the length of wiring which is
connected to VHOLD, HLF, and CVIN pin as
short as possible so that a leakage current
may not be generated when mounting a
resistor or a capacitor on each pin.
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相关代理商/技术参数
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