ADV7192 datasheet(40/69 Pages) AD

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ADV7192

–40–

REV. 0

HUE ADJUST CONTROL REGISTER (HCR)

(Address (SR5–SR0) = 20H)

The hue control register is an 8-bit-wide register used to adjust

the hue on the composite and chroma outputs. Figure 81 shows

the operation under control of this register.

HCR7 – HCR0

HUE ADJUST VALUE

HCR7

HCR6

HCR5

HCR4

HCR3

HCR2

HCR1

HCR0

Figure 81. Hue Control Register

HCR BIT DESCRIPTION

Hue Adjust Value (HCR0–HCR7)

These eight bits represent the value required to vary the hue of

the video data, i.e., the variance in phase of the subcarrier during

active video with respect to the phase of the subcarrier during

the colorburst. The ADV7192 provides a range of

±22.5° incre-

ments of 0.17578125

°. For normal operation (zero adjustment),

this register is set to 80Hex. FFHex and 00Hex represent the

upper and lower limit (respectively) of adjustment attainable.

Hue Adjust [

°] = 0.17578125° × (HCRd – 128); for positive Hue

Adjust Value

Example:

To adjust the hue by 4

° write 97h to the Hue Adjust Control

(4/0.17578125) + 128 = 151d* = 97h

To adjust the hue by (–4

°) write 69

h to the Hue Adjust Control

(–4/0.17578125) + 128 = 105d* = 69h

*Rounded to the nearest integer.

BRIGHTNESS CONTROL REGISTER (BCR)

(Address (SR5–SR0) = 21H)

The brightness control register is an 8-bit-wide register which

allows brightness control. Figure 82 shows the operation under

control of this register.

BCR BIT DESCRIPTION

Brightness Value (BCR0–BCR6)

Seven bits of this 8-bit-wide register are used to control the

brightness level. The brightness is controlled by adding a pro-

grammable setup level onto the scaled Y data. This brightness

level can be a positive or negative value.

The programmable brightness levels in NTSC, without pedestal,

and PAL are max 15 IRE and min –7.5 IRE, in NTSC pedestal

max 22.5 IRE and min 0 IRE.

Table IV. Brightness Control Register Value

Setup

Brightness

Level in

Setup

Control

NTSC with

NTSC No

Level in

Pedestal

PAL

Value

22.5 IRE

15 IRE

1Eh

15 IRE

7.5 IRE

0Fh

7.5 IRE

0 IRE

00h

0 IRE

–7.5 IRE

71h

NOTE

Values in the range from 3Fh to 44h might result in an invalid output signal.

EXAMPLE

1. Standard: NTSC with Pedestal. To add 20 IRE brightness level write 28h into the Brightness Control Register:

[Brightness Control Register Value]h = [IRE Value

2.015631]h = [20

2.015631]h = [40.31262]h = 28h

2. Standard: PAL. To add –7 IRE brightness level write 72h into the Brightness Control Register:

[|IRE Value|

2.015631] = [7

2.015631] = [14.109417] = 0001110b

[0001110] into two’s complement = 1110010b = 72h

BCR6 – BCR0

BRIGHTNESS VALUE

BCR7

ZERO MUST BE

WRITTEN TO

THIS BIT

BCR7

BCR6

BCR5

BCR4

BCR3

BCR2

BCR1

BCR0

100 IRE

0 IRE

+7.5 IRE

–7.5 IRE

NTSC WITHOUT PEDESTAL

NO SETUP VALUE

ADDED

POSITIVE SETUP

VALUE ADDED

WRITE TO BRIGHTNESS

CONTROL REGISTER: 12h

NEGATIVE SETUP

VALUE ADDED

WRITE TO BRIGHTNESS

CONTROL REGISTER: 6Eh

Figure 82. Brightness Control Register

ADV7192 Datasheet(PDF) 40 Page - Analog Devices

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