M37151MA datasheet(49/138 Pages) RENESAS

49 / 138 page

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

Rev.1.00

Nov 01, 2002

page 49 of 136

REJ03B0129-0100Z

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

data slicer control register 1 (address 00E016) to “0.” These settings

support low-power dissipation.

Fig. 8.10.1 Data Slicer Block Diagram

Composite

video

signal

1 M

Ω

Sync pulse counter

(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

µF

470

Ω

560 pF

CVIN

µF

1 k

Ω

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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