STV2247H 查看數據表（PDF） - STMicroelectronics

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STV2247H

I2C BUS-CONTROLLED MULTISTANDARD SINGLE CHIP TV PROCESSOR

STMicroelectronics 

STV224XH/228XH/223XH - I²C BUS SELECTION

Reg.

Addr

(Hex)

Description

Data

Bits

d7 d6 d5 d4 d3 d2 d1 d0

Comments

06

PIF VCO Compen-

sation

1

X X X X X X X 0 0 = Optimized for PIF from 33.9 to 38.9 MHz

X X X X X X X 1 1 = Optimized for PIF 45.75 & 58.75 MHz

2 X X X X X 0 0 X 6.5 MHz sound selected.

Sound Standard

Selection

X X X X X 0 1 X 6.0 MHz sound selected.

X X X X X 1 0 X 5.5 MHz sound selected.

X X X X X 1 1 X 4.5 MHz sound selected.

AGC SIF time

constant (AM)

1 X X X X 0 X X X 0 = Auto Time constant.

X X X X 1 X X X 1 = Fast Time constant forced.

SAW filter switch 1 X X X 0 X X X X 0 = output low (0.4 V Max.).

output

X X X 1 X X X X 1 = output high (4 V Min.).

CVBS output

(from PIF circuit)

1

X X 0 X X X X X 0 = CVBS output enable.

X X 1 X X X X X 1 = CVBS output muted.

QSS/Inter-carrier

Application

1

X 0 X X X X X X 0 = QSS application, intercarrier filter OFF

X 1 X X X X X X 1 = Intercarrier application

Not to be used

1 0 XXXXXXX

6.3.6 Video Controls

Reg.

Addr

(Hex)

Description

Data

Bits

d7 d6 d5 d4 d3 d2 d1 d0

Comments

07

Contrast Control

6 X X 0 0 0 0 0 0 -24 dB gain (Min. contrast).

X X 1 1 1 1 1 1 0 dB gain (Max. contrast).

RGB Peak

Limitation

0 = APR, APR Threshold, tracked with contrast.

1 X 0 X X X X X X 1 = RGB Peak Limitation, threshold not tracked with

X 1 X X X X X X contrast.

Note: RGB Peak Limitation active when WR10 d0 =

1

Blue Screen

Feature

1 0 X X X X X X X 0 = Blue screen OFF.

1 X X X X X X X 1 = Blue screen ON.

08

Saturation Control

6

X X 0 0 0 0 0 0 -40 dB gain (Min. saturation).

X X 1 1 1 1 1 1 +9 dB gain (Max. saturation).

Half Contrast Ena- 1 X 0 X X X X X X 0 = Disabled.

ble

X 1 X X X X X X 1 = Enabled.

Oversize Blanking 1 0 X X X X X X X 0 = Disabled.

Enable

1 X X X X X X X 1 = Enabled.

09

Brightness Control 6

X X 0 0 0 0 0 0 -30% of B/W at Max. contrast.

X X 1 1 1 1 1 1 +30% of B/W at Max. contrast.

RGB Blanking

1 X 0 X X X X X X 0 = Not active (normal operation).

X 1 X X X X X X 1 = Active.

Cut-off Blanking

1 0 X X X X X X X 0 = Enable: RGB output blanked when ICATH voltage

is far from internal cut-off reference (cut-off loop not

locked), during IC start-up.

1 X X X X X X X 1 = Disable: RGB output not blanked by cut-off loop.

49/86

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