hmp8112acn Harris Corporation, hmp8112acn Datasheet - Page 15

• Manufacturer Part Number: hmp8112acn
• Description: Ntsc/pal Video Decoder
• Manufacturer: Harris Corporation

NUMBER
NUMBER
7 - 6
2 - 1
6 - 0
BIT
BIT
5
4
3
0
7
Video Input
Standard
Color Trap Filter
Disable
Chrominance Low
Pass Filter Disable
Automatic Color
Gain Control
A/D Converter
Multiplexer Selects
Not Used
IRE Setup
Cancellation Control
Luminance
Brightness Control
FUNCTION
FUNCTION
These bits select the video input standard.
00 = PAL B, G, H, I, N; 4.43MHz subcarrier; 50fps; 625 lines/frame;
01 = PAL M; 3.58MHz subcarrier; 60fps; 525 lines/frame;
10 = Special PAL N; 3.58MHz subcarrier; 50fps; 625 lines/frame;
11 = NTSC M; 3.58MHz subcarrier; 60fps; 525 lines/frame (default);
This bit enables the color subcarrier trap filter. The filter removes the color subcarrier infor-
mation from the luminance channel. The filter should be enabled for PAL Standard systems.
0 = Enabled
1 = Disabled (default)
This bit enables the chrominance low pass filter. This filter band limits the chrominance
channel to remove luminance artifacts. This filter should be enabled for PAL Standard
systems.
0 = Enabled
1 = Disabled (default)
This bit enables the color AGC function. When this bit is set the color AGC will automati-
cally adjust the chrominance channel gain, to drive the color reference burst to a nominal
r20 IRE’s. When this bit is cleared the color AGC gain factor is set to 1.0 and the color
saturation must be adjusted to obtain nominal CrCb values.
0 = Disabled
1 = Enabled (default)
These bits control the A/D input select multiplexers and whether S-Video is being input as
follows:
0, 0 = Select Composite Video Input = LIN0 (Pin 7), set decoder for Composite
1, 0 = Select Composite Video Input = LIN1 (Pin 6), set decoder for Composite
0, 1 = Select Composite Video Input = LIN2 (Pin 5), set decoder for Composite
1, 1 = Select S-Video Y Input = LIN2 (Pin 5) and C Input = CIN (Pin 19)
Write Ignored, Read 0’s
This bit enables the black setup cancellation circuit for NTSC sources. When this bit is set
a value of 73 is used to strip the sync information from the video signal. When this bit is
cleared a value of 64 is used to strip the sync information.
0 = subtract 64 from the luminance signal
1 = subtract 73 from the luminance signal
These bits control the brightness adjustment to the luminance channel. The brightness
adjustment value is a number that ranges from +63 to -64. This register is in the two’s
complement format, where bit 6 is the sign bit.
TABLE 7. LUMINANCE BRIGHTNESS CONTROL
TABLE 6. VIDEO INPUT CONTROL
SUB ADDRESS = 0x00
SUB ADDRESS = 0x01
HMP8112A
4-15
DESCRIPTION
DESCRIPTION
000 0000
RESET
RESET
STATE
STATE
11
00
1
1
1
0
1
B
B
B
B
B
B
B
B