ADV7172KST datasheet(39/59 Pages) AD

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ADV7172/ADV7173

–39–

REV. A

CC17

CC16

CC15

CC14

CC13

CC12

CC11

CC10

CC15–CC10

U SCALAR VALUE

CC17 CC16

ZERO SHOULD

BE WRITTEN

TO THESE BITS

CC27

CC26

CC25

CC24

CC23

CC22

CC21

CC20

CC25–CC20

V SCALAR VALUE

CC27 CC26

ZERO SHOULD

BE WRITTEN

TO THESE BITS

Figure 64. Color Control Registers

HCR7

HCR6

HCR5

HCR4

HCR3

HCR2

HCR1

HCR0

HCR7–HCR0

HUE ADJUST VALUE

Figure 65. Hue Control Register

COLOR CONTROL REGISTERS 2–1 (CC2–CC1)

(Address (SR4–SR0) = 1EH–1FH)

The color control registers are 8-bit-wide registers used to scale

the U and V output levels. Figure 64 shows the operations un-

der control of these registers.

CC1 BIT DESCRIPTION

Reserved (CC17–CC16)

A Logic “0” must be written to these bits.

U Scalar Value (CC15–CC10)

These six bits represent the value required to scale the U level

from 0.75 to 1.25 of its initial level. The value of these six bits is

calculated using the following equation:

Color Control Register 1 = (X – 0.75)

× 128

where X = Scaling factor for U

e.g., Scale U by 0.8

Color Control Register 1 = (0.8 – 0.75)

× 128 = 6.4 = 000110

(rounded to the nearest integer)

CC2 BIT DESCRIPTION

Reserved (CC27–CC26)

A Logic “0” must be written to these bits.

V Scalar Value (CC25–CC20)

These six bits represent the value required to scale the V pixel

data from 0.75 to 1.25 of its initial level. The value of these six

bits is calculated using the following equation:

Color Control Register 2 = (X – 0.75)

× 128

where X = Scaling factor for V

e.g., Scale V by 1.2

Color Control Register 2 = (1.2 – 0.75)

× 128 = 57.6 = 111001

(rounded to the nearest integer)

HUE CONTROL REGISTERS (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 65 shows

the operation under control of this register.

HCR BIT DESCRIPTION

Hue Control Value (HCR7–HCR0)

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

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

respect to the phase of the subcarrier during the color burst.

The ADV7172/ADV7173 provides a range of

±22° in incre-

ments of 0.17578125

°. For normal operation (zero adjustment)

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

upper and lower limit (respectively) of adjustment attainable.

Hue Adjust = (0.17568125

× [HCR7 – HCR0 – 128]).

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