M37271MF-252SP datasheet(29/97 Pages) MITSUBISHI

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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

DATA SLICER

The M37271MF-XXXSP 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 composite 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 can

be cut off by setting bit 0 of the data slicer control register 1 (address

00EA16) to “0.” Also, the timing signal generating circuit can be cut

off by setting bit 0 of data slicer control register 2 (address 00EB16)

to “0.” These settings can realize the low-power dissipation.

Fig. 22. Data slicer block diagram

10 0

00 00 10 1

Composite

video

signal

Hundred of kiloohms

to 1 M

Ω

Sync pulse counter

(address 020F16)

Clock run-in register 2

(address 00E716)

Data slicer control register 2

(address 00EB16)

Data slicer control register 1

(address 00EA16)

Window register

(address 00E216)

Clock run-in register 1

(address 00E616)

Caption position register

(address 00E016)

Start bit position register

(address 00E116)

Clock run-in detect register 1

(address 00E816)

Clock run-in detect register 2

(address 00E916)

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

Data register 1

(address 00E416)

Data register 2

(address 00E516)

Sync slice register 3

(address

00E316)

Data bus

Comparator

0 111

00 0

0 10 1

0.1

µF

470

Ω

560 pF

CVIN

µF

1 k

Ω

200 pF

15 k

Ω

HSYNC

HLF

RVCO

–

Reference

voltage

generating

circuit

VHOLD

1000 pF

high-order

low-order

Data slicer ON/OFF

Data register 4

(address 00ED16)

Data register 3

(address 00EC16)

Data slicer control

(address 021016)

Clock run-in detect

(address 020816)

Clock run-in

(address 020916)

External circuit

Note: Make the length of wiring which is

connected to VHOLD, HLF, RVCO

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.

M37271MF-252SP Datasheet(PDF) 29 Page - Mitsubishi Electric Semiconductor

M37271MF-252SP Datasheet(HTML) 29 Page - Mitsubishi Electric Semiconductor

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