HMP8112A 查看數據表（PDF） - Harris Semiconductor

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HMP8112A

NTSC/PAL Video Decoder

Harris Semiconductor 

HMP8112A

TABLE 6. VIDEO INPUT CONTROL

SUB ADDRESS = 0x00

BIT

NUMBER

FUNCTION

DESCRIPTION

RESET

STATE

7 - 6 Video Input

These bits select the video input standard.

11B

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);

5

Color Trap Filter This bit enables the color subcarrier trap filter. The filter removes the color subcarrier infor-

1B

Disable

mation from the luminance channel. The filter should be enabled for PAL Standard systems.

0 = Enabled

1 = Disabled (default)

4

Chrominance Low This bit enables the chrominance low pass filter. This filter band limits the chrominance

1B

Pass Filter Disable channel to remove luminance artifacts. This filter should be enabled for PAL Standard

systems.

0 = Enabled

1 = Disabled (default)

3

Automatic Color

This bit enables the color AGC function. When this bit is set the color AGC will automati-

1B

Gain Control

cally adjust the chrominance channel gain, to drive the color reference burst to a nominal

±20 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)

2 - 1 A/D Converter

These bits control the A/D input select multiplexers and whether S-Video is being input as

00B

Multiplexer Selects 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)

0

Not Used

Write Ignored, Read 0’s

0B

TABLE 7. LUMINANCE BRIGHTNESS CONTROL

SUB ADDRESS = 0x01

BIT

NUMBER

FUNCTION

DESCRIPTION

RESET

STATE

7

IRE Setup

This bit enables the black setup cancellation circuit for NTSC sources. When this bit is set

1B

Cancellation Control 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

6-0

Luminance

Brightness Control

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.

000 0000B

4-15

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