M306V2EEFS datasheet(166/271 Pages) RENESAS

166 / 271 page

Rev.1.40

Oct 06, 2004 page 166 of 269

M306V2ME-XXXFP, M306V2EEFP

2.14 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 composite

video signal. A composite video signal which makes the sync tip’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 026016) to “0.” These settings can

realize the low-power dissipation.

Note: When using the data slicer, set bit 7 of the peripheral mode register (address 027D16) according to

the main clock frequency.

Figure 2.14.1 Data slicer block diagram

Composite

video

signal

1 M

Ω

Data slicer control register 2

(address 026116)

Data slicer control register 1

(address 026016)

Clock run-in detect

(address 026916)

Caption position register

(address 026616)

Data clock position register

(address 026A16)

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

(addresses 026316, 026216)

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

Data slicer ON/OFF

Caption data register 2

(addresses 026516, 026416)

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.

Rev. 1.2

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