STV2236 datasheet(56/86 Pages) STMICROELECTRONICS

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STV224X, STV228X, STV223X - I²C BUS SELECTION

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6.5 POWER-ON RESET - INITIAL BUS REGISTER CONDITIONS

Power-On Reset is active when the power supply VCCD is below 3 Volts.

All data from all registers must be written by microprocessor after power-on. Unused data must be set to

0. POR values are not tested during production.

Reg.

Addr.

(Hex)

Initial Data Value

Comments

d7 d6 d5 d4 d3 d2 d1 d0

100000

PIFVCO free running fine adjustment Typical.

000001

PIFVCO coarse typ, BG = 38.9 MHz, Negative modulation, AFC active,

no PIF over-modulation regulation.

000100

CVBS amplitude Typical, 2VPP.

001000

Tuner AGC starting point Typical, Tuner AGC gain Min.

000000

FM/AM out selected, FM de-emphasis and FM deviation auto-control, FM demod.

active, FM out selected, QSS and AM demod. active.

011111

Volume control attenuation at maximum, linear curve (dB).

000000

PIF < 42 MHz, 6.5 MHz sound carrier selected, auto AGC SIF time constant, saw

filter switch control at low level, CVBS out enabled, QSS mode.

001000

Contrast at middle, blue screen disabled.

001000

Saturation at middle, half contrast disabled, oversize blanking disabled.

001000

Brightness at middle, RGB Blanking not active.

001000

Red drive at middle, RGBext insertion enabled (FBext Pin control).

001000

Green drive at middle, black stretch disabled, black stretch ref 0IRE.

001000

Blue drive at middle, cut-off loop active.

001000

Red cut-off at middle, automatic cut-off loop.

001000

Green cut-off at middle.

000010

Peaking on luma at middle, coring off, trap ON (CVBS & color identified), CVBS2

ON, white insertion not active.

000100

APR disabled, APR threshold at middle, RGB OSD contrast disabled.

000000

No shift of bell filter center frequency, 0dB P/N demod. gain, 90° matrix selection,

ACC overload ON.

000000

No shift of bandpass center frequency, chroma reference output off, chroma delay

line on.

000000

Two crystals application P/S/N, PAL XTAL1 forced mode, two crystal applications.

001000

Hue at middle, flesh disabled, normal flesh characteristic.

000000

CVBS1 selected on main CVBS output, CVBS1 selected on second CVBS output,

CVBS mode.

001000

Horizontal shift at middle, horizontal output enabled, interlace mode.

001000

Vertical amplitude at middle, auto 50/60 Hz identification.

000010

Vertical position at middle, automatic time constant selection on PLL1, PLL1 active,

Vertical synchronization active.

000000

0.1 V low level at pin VERT, frame blanking adapted to standard, noise detector low

threshold.

000000

Not active, auto cut-off.

000000

Not active, auto cut-off.

000000

Not active, auto cut-off.

000000

R-Y output at pin 29 (SDIP56)

000000

Not to be used, except d4: Auto. SIF AGC time constant control in L/L’ standards.

000000

VERT pulse active, standard luma delay, AVL off, AM/FM mono sound selected.

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