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参数资料
| 型号： | M37271EFSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP52 |
| 封装： | 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-52 |
| 文件页数： | 28/64页 |
| 文件大小： | 1252K |
| 代理商： | M37271EFSP |
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MITSUBISHI MICROCOMPUTERS
M37271MF-XXXSP
M37271EF-XXXSP, M37271EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
31
(1) Clamping Circuit and Low-pass Filter
This filter attenuates the noise of the composite video signal input
from the CVIN pin. The CVIN pin to which composite video signal is
input requires a capacitor (0.1
F) coupling outside. Pull down the
CVIN pin with a resistor of hundreds of kiloohms to 1 M . In addition,
we recommend to install externally a simple low-pass filter using a
resistor and a capacitor at the CVIN pin (refer to Figure 22).
(2) Sync Slice Circuit
This circuit takes out a composite sync signal from the output signal
of the low-pass filter. Figure 24 shows the structure of the sync slice
register.
(3) Synchronizing Signal Separation Circuit
This circuit separates a horizontal synchronizing signal and a vertical
synchronizing signal from the composite sync signal taken out in the
sync slice circuit.
1Horizontal synchronizing signal (Hsep)
A one-shot horizontal synchronizing signal Hsep is generated at
the falling edge of the composite sync signal.
2 Vertical synchronizing signal (Vsep)
As a Vsep signal generating method, it is possible to select one of
the following 2 methods by using bit 7 of the sync slice register
(address 00E316).
Method 1
The “L” level width of the composite sync signal is
measured. If this width exceeds a certain time, a Vsep
signal is generated in synchronization with the rising
of the timing signal immediately after this “L” level.
Method 2
The “L” level width of the composite sync signal is
measured. If this width exceeds a certain time, it is
detected whether a falling of the composite sync
signal exits or not in the “L” level period of the timing
signal immediately after this “L” level. If a falling exists,
a Vsep signal is generated in synchronization with
the rising of the timing signal (refer to Figure 25).
Figure 25 shows a Vsep generating timing. The timing signal shown
in the figure is generated from the reference clock which the timing
generating circuit outputs.
Reading bit 5 of data slicer control register 2 permits determinating
the shape of the V-pulse portion of the composite sync signal. As
shown in Figure 26, when the A level matches the B level, this bit is
“0.” In the case of a mismatch, the bit is “1.”
For the pins RVCO and the HLF, connect a resistor and a capacitor
as shown in Figure 22. Make the length of wiring which is connected
to these pins as short as possible so that a leakage current may not
be generated.
Note: It takes a few tens of milliseconds until the reference clock
becomes stable after the data slicer and the timing signal
generating circuit are started. In this period, various timing
signals, Hsep signals and Vsep signals become unstable. For
this reason, take stabilization time into consideration when
programming.
Fig. 24. Structure of sync slice register
Fig. 25. Vsep generating timing (method 2)
Composite
sync signal
Timing
signal
Vsep signal
Measure “L” period
A Vsep signal is generated at a rising of the timing signal
immediately after the “L” level width of the composite
sync signal exceeds a certain time.
00
0
7
Sync slice register
(SSL : address 00E316)
Fix these bits to “00001012”
Vertical synchronizing
signal (Vsep) generating
method selection bit
0 : Method 1
1 : Method 2
00
1
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PDF描述 |
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| M37271MF-XXXSP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP52 |
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| M37273MF-XXXSP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP52 |
| M37274EFSP | 8-BIT, OTPROM, MICROCONTROLLER, PDIP52 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37271EFSS | 功能描述:EPROM MCU/8BIT CMOS EMULATION CH RoHS:否 类别:编程器，开发系统 >> 配件 系列:- 标准包装:1 系列:- 附件类型:适配器板 适用于相关产品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE |
| M37271EF-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-213SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-219SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
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