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参数资料
| 型号： | M37272M6H-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： | 86/132页 |
| 文件大小： | 1736K |
| 代理商： | M37272M6H-XXXSP |
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56
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37272M6H/M8H/MAH/MFH–XXXSP/FP
M37272E8SP/FP, M37272EFSP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.10.7 Reference Voltage Generating Circuit
and Comparator
The composite video signal clamped by the clamping circuit is input
to the reference voltage generating circuit and the comparator.
(1) Reference voltage generating circuit
This circuit generates a reference voltage (slice voltage) by us-
ing the amplitude of the clock run-in pulse in line specified by the
data slice line specification circuit. Connect a capacitor between
the VHOLD pin and the VSS pin, and make the length of wiring as
short as possible so that a leakage current may not be gener-
ated.
(2) Comparator
The comparator compares the voltage of the composite video
signal with the voltage (reference voltage) generated in the refer-
ence voltage generating circuit, and converts the composite video
signal into a digital value.
Fig. 8.10.10 Clock Run-in Detect Register
8.10.8 Start Bit Detecting Circuit
This circuit detects a start bit at line decided in the data slice line
specification circuit.
The detection of a start bit is described below.
A sampling clock is generated by dividing the reference clock out-
put by the timing signal.
A clock run-in pulse is detected by the sampling clock.
After detection of the pulse, a start bit pattern is detected from the
comparator output.
8.10.9 Clock Run-in Determination Circuit
This circuit determinates clock run-in by counting the number of pulses
in a window of the composite video signal.
The reference clock count value in one pulse cycle is stored in bits 3
to 7 of the clock run-in detect register (address 00E416). Read out
these bits after the occurrence of a data slicer interrupt (refer to
“8.10.12 Interrupt Request Generating Circuit”).
Figure 8.10.10 shows the structure of clock run-in detect register.
b7 b6 b5 b4 b3 b2 b1 b0
Clock run-in detect register (CRD) [Address 00E4 16]
R W
Clock Run-in Detect Register
0
to
2
0R —
Test bits
3
to
7
Number of reference clocks to
be counted in one clock run-in
pulse period.
Clock run-in detection bit
(CRD3 to CRD7)
0R —
Read-only
B
After reset
Functions
Name
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| MC9S12DJ128EMFU | 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37272M6-XXXFP | 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 |
| M37272M6-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 |
| M37272M8 | 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 |
| M37272M8-062FP | 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 |
| M37272M8-084FP | 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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