Renesas PCA7429G02 Informations techniques télécharger pdf (Page 52)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37272M6/M8–XXXSP/FP, M37272MA–XXXSP

M37272E8SP/FP, M37272EFSP

MITSUBISHI MICROCOMPUTERS

Rev. 1.3

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 MΩ

Sync pulse counter

(address 00E9

)

Data slicer control register 2

(address 00E1

)

Data slicer control register 1

(address 00E0

)

Clock run-in defect register

(address 00E4

)

Caption position register

(address 00E6

)

Data clock position register

(address 00E5

)

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 00E2

16)

Caption data register 2

(address 00E3

16)

Data bus

Comparator

0.1 µF

470 Ω

560 pF

1 µF

1 kΩ

200 pF

SYNC

HLF

–

Reference

voltage

generating

circuit

HOLD

1000 pF

high-order low-order

Data slicer ON/OFF

Caption data register 4

(address 00CF

16)

Caption data register 3

(address 00CE16)

External circuit

Note : Make the length of wiring which is

connected to V

HOLD, 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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Renesas PCA7429G02 Informations techniques Page 52

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