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STV2236 数据表(PDF) 49 Page - STMicroelectronics |
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STV2236 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 86 page ![]() STV224XH/228XH/223XH - I²C BUS SELECTION 49/86 6.3.6 Video Controls 06 PIF VCO Compen- sation 1 X X X X X X X X X X X X X X 0 1 0 = Optimized for PIF from 33.9 to 38.9 MHz 1 = Optimized for PIF 45.75 & 58.75 MHz Sound Standard Selection 2X X X X X X X X X X X X X X X X X X X X 0 0 1 1 0 1 0 1 X X X X 6.5 MHz sound selected. 6.0 MHz sound selected. 5.5 MHz sound selected. 4.5 MHz sound selected. AGC SIF time constant (AM) 1X X X X X X X X 0 1 X X X X X X 0 = Auto Time constant. 1 = Fast Time constant forced. SAW filter switch output 1X X X X X X 0 1 X X X X X X X X 0 = output low (0.4 V Max.). 1 = output high (4 V Min.). CVBS output (from PIF circuit) 1 X X X X 0 1 X X X X X X X X X X 0 = CVBS output enable. 1 = CVBS output muted. QSS/Inter-carrier Application 1 X X 0 1 X X X X X X X X X X X X 0 = QSS application, intercarrier filter OFF 1 = Intercarrier application Not to be used 1 0 X X X X X X X Reg. Addr (Hex) Description Bits Data Comments d7 d6 d5 d4 d3 d2 d1 d0 Reg. Addr (Hex) Description Bits Data Comments d7 d6 d5 d4 d3 d2 d1 d0 07 Contrast Control 6X X X X 0 1 0 1 0 1 0 1 0 1 0 1 -24 dB gain (Min. contrast). 0 dB gain (Max. contrast). RGB Peak Limitation 1X X 0 1 X X X X X X X X X X X X 0 = APR, APR Threshold, tracked with contrast. 1 = RGB Peak Limitation, threshold not tracked with contrast. Note: RGB Peak Limitation active when WR10 d0 = 1 Blue Screen Feature 10 1 X X X X X X X X X X X X X X 0 = Blue screen OFF. 1 = Blue screen ON. 08 Saturation Control 6X X X X 0 1 0 1 0 1 0 1 0 1 0 1 -40 dB gain (Min. saturation). +9 dB gain (Max. saturation). Half Contrast Ena- ble 1X X 0 1 X X X X X X X X X X X X 0 = Disabled. 1 = Enabled. Oversize Blanking Enable 10 1 X X X X X X X X X X X X X X 0 = Disabled. 1 = Enabled. 09 Brightness Control 6X X X X 0 1 0 1 0 1 0 1 0 1 0 1 -30% of B/W at Max. contrast. +30% of B/W at Max. contrast. RGB Blanking 1X X 0 1 X X X X X X X X X X X X 0 = Not active (normal operation). 1 = Active. Cut-off Blanking 10 1 X X X X X X X 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 = Disable: RGB output not blanked by cut-off loop. |
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